Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2020	Aug. 04, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-39039
Entity Registrant Name	Cloudflare, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-0805829
Entity Address, Address Line One	101 Townsend Street
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94107
City Area Code	888
Local Phone Number	993-5273
Title of 12(b) Security	Class A Common Stock, $0.001 par value
Trading Symbol	NET
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0001477333
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		192,731,407
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		112,994,701

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 313,983	$ 138,976
Available-for-sale securities	755,108	497,972
Accounts receivable, net	43,646	33,867
Contract assets	2,224	2,063
Prepaid expenses and other current assets	17,163	16,994
Total current assets	1,132,124	689,872
Property and equipment, net	114,549	101,466
Goodwill	17,167	4,083
Acquired intangible assets, net	4,200	31
Operating lease right-of-use assets	46,150	0
Deferred contract acquisition costs, noncurrent	33,880	25,184
Restricted cash	8,847	6,660
Other noncurrent assets	7,138	3,528
Total assets	1,364,055	830,824
Current liabilities:
Accounts payable	17,278	11,463
Accrued expenses and other current liabilities	32,076	28,314
Operating lease liabilities	17,239	0
Liability for early exercise of unvested stock options	10,735	13,263
Deferred revenue	43,419	30,843
Total current liabilities	120,747	83,883
Convertible senior notes, net	365,949	0
Build-to-suit lease financing obligation	0	10,506
Operating lease liabilities, noncurrent	30,869	0
Deferred revenue, noncurrent	1,599	804
Other noncurrent liabilities	9,273	9,803
Total liabilities	528,437	104,996
Commitments and contingencies (Note 8)
Stockholders’ Equity:
Additional paid-in capital	1,194,125	1,027,179
Accumulated deficit	(360,031)	(301,706)
Accumulated other comprehensive income	1,224	61
Total stockholders’ equity	835,618	725,828
Total liabilities and stockholders’ equity	1,364,055	830,824
Class A common stock
Stockholders’ Equity:
Common stock	184	87
Class B common stock
Stockholders’ Equity:
Common stock	$ 116	$ 207

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Class A common stock
Stockholders’ Equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,250,000,000	2,250,000,000
Common stock, shares issued (in shares)	184,900,249	87,071,783
Common stock, shares outstanding (in shares)	184,900,249	87,071,783
Class B common stock
Stockholders’ Equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	315,000,000	315,000,000
Common stock, shares issued (in shares)	120,523,936	213,101,364
Common stock, shares outstanding (in shares)	120,523,936	213,101,364

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 99,721	$ 67,424	$ 190,971	$ 129,151
Cost of revenue	24,164	14,832	44,985	29,192
Gross profit	75,557	52,592	145,986	99,959
Operating expenses:
Sales and marketing	51,376	35,836	98,341	66,653
Research and development	28,131	18,868	61,485	36,517
General and administrative	20,754	17,659	46,935	33,707
Total operating expenses	100,261	72,363	206,761	136,877
Loss from operations	(24,704)	(19,771)	(60,775)	(36,918)
Non-operating income (expense):
Interest income	1,857	830	4,426	1,743
Interest expense	(5,007)	(290)	(5,074)	(563)
Other income (expense), net	(219)	(86)	266	(379)
Total non-operating income (expense), net	(3,369)	454	(382)	801
Loss before income taxes	(28,073)	(19,317)	(61,157)	(36,117)
Provision for (benefit from) income taxes	(1,938)	389	(2,276)	703
Net loss	$ (26,135)	$ (19,706)	$ (58,881)	$ (36,820)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.09)	$ (0.23)	$ (0.20)	$ (0.43)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	299,321	85,683	297,392	85,382

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (26,135)	$ (19,706)	$ (58,881)	$ (36,820)
Other comprehensive income (loss):
Change in unrealized gain (loss) on investments, net of tax	(183)	51	1,163	123
Other comprehensive income (loss)	(183)	51	1,163	123
Comprehensive loss	$ (26,318)	$ (19,655)	$ (57,718)	$ (36,697)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Conversion of Class B Common Stock To Class A Common Stock	Common Stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Redeemable convertible preferred stock	Class A common stock	Class A common stock Common Stock	Class A common stock Common Stock Conversion of Class B Common Stock To Class A Common Stock	Class B common stock	Class B common stock Common Stock	Class B common stock Common Stock Conversion of Class B Common Stock To Class A Common Stock
Beginning balance (in shares) at Dec. 31, 2018							165,658,000
Beginning balance at Dec. 31, 2018							$ 331,521
Ending balance (in shares) at Jun. 30, 2019							165,658,000
Ending balance at Jun. 30, 2019							$ 331,521
Beginning balance (in shares) at Dec. 31, 2018			91,542,000
Beginning balance at Dec. 31, 2018	$ (113,505)		$ 85	$ 82,345	$ (195,878)	$ (57)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition (in shares)			7,000
Issuance of common stock in connection with acquisition	18			18
Issuance of common stock upon exercise of stock options (in shares)			581,000
Issuance of common stock upon exercise of stock options	1,067		$ 1	1,066
Repurchases of unvested common stock (in shares)			(40,000)
Issuance of common stock related to early exercised stock options (in shares)			596,000
Vesting of shares issued upon early exercise of stock options	1,438			1,438
Stock-based compensation	2,244			2,244
Net loss	(36,820)		$ (36,820)		(36,820)
Other comprehensive income (loss)	123
Ending balance (in shares) at Jun. 30, 2019			92,686,000
Ending balance at Jun. 30, 2019	(145,435)		$ 86	87,111	(232,698)	66
Beginning balance (in shares) at Mar. 31, 2019							165,658,000
Beginning balance at Mar. 31, 2019							$ 331,521
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)							0
Issuance of common stock in connection with acquisition							$ 0
Ending balance (in shares) at Jun. 30, 2019							165,658,000
Ending balance at Jun. 30, 2019							$ 331,521
Beginning balance (in shares) at Mar. 31, 2019			92,293,000
Beginning balance at Mar. 31, 2019	(128,224)		$ 85	84,668	(212,992)	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			235,000
Issuance of common stock upon exercise of stock options	386		$ 1	385
Repurchases of unvested common stock (in shares)									(31,000)
Issuance of common stock related to early exercised stock options (in shares)			189,000
Vesting of shares issued upon early exercise of stock options	942			942
Stock-based compensation	1,116			1,116
Net loss	(19,706)		$ (19,706)		(19,706)
Other comprehensive income (loss)	51					51
Ending balance (in shares) at Jun. 30, 2019			92,686,000
Ending balance at Jun. 30, 2019	(145,435)		$ 86	87,111	(232,698)	66
Beginning balance (in shares) at Dec. 31, 2019							0
Beginning balance at Dec. 31, 2019							$ 0
Ending balance (in shares) at Jun. 30, 2020							0
Ending balance at Jun. 30, 2020							$ 0
Beginning balance (in shares) at Dec. 31, 2019								87,071,783	87,072,000		213,101,364	213,101,000
Beginning balance at Dec. 31, 2019	$ 725,828			1,027,179	(301,706)	61			$ 87			$ 207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition (in shares)	948,000								107,000
Issuance of common stock in connection with acquisition	$ 1,821			1,821
Issuance of unvested restricted stock in connection with acquisition (in shares)									841,000
Issuance of common stock upon exercise of stock options (in shares)	2,618,000											2,582,000
Issuance of common stock upon exercise of stock options	$ 4,335			4,333								$ 2
Repurchases of unvested common stock (in shares)									(37,000)
Issuance of common stock related to early exercised stock options (in shares)												36,000
Vesting of shares issued upon early exercise of stock options	2,511			2,509								$ 2
Issuance of common stock related to settlement of RSUs (in shares)									82,000			1,645,000
Issuance of common stock related to settlement of RSUs	1			(1)								$ 2
Tax withholding on RSU settlement (in shares)									(11,000)			(402,000)
Tax withholding on RSU settlement	(7,308)			(7,308)
Conversion of Class B to Class A common stock (in shares)										96,438,000			96,438,000
Conversion of Class B to Class A common stock		$ 0								$ 97			$ (97)
Equity component of convertible senior notes, net of issuance costs	200,812			200,812
Purchases of capped calls related to convertible senior notes	(67,333)			(67,333)
Common stock issued under employee stock purchase plan (in shares)									421,000
Common stock issued under employee stock purchase plan	5,447			5,447
Tax withholding on common stock issued under employee stock purchase plan (in shares)									(13,000)
Tax withholding on common stock issued under employee stock purchase plan	(376)			(376)
Stock-based compensation	27,042			27,042
Net loss	(58,881)				(58,881)				$ (26,404)			$ (32,477)
Other comprehensive income (loss)	1,163					1,163
Ending balance (in shares) at Jun. 30, 2020								184,900,249	184,900,000		120,523,936	120,524,000
Ending balance at Jun. 30, 2020	835,618			1,194,125	(360,031)	1,224			$ 184			$ 116
Beginning balance (in shares) at Mar. 31, 2020							0
Beginning balance at Mar. 31, 2020							$ 0
Ending balance (in shares) at Jun. 30, 2020							0
Ending balance at Jun. 30, 2020							$ 0
Beginning balance (in shares) at Mar. 31, 2020									154,622,000			148,735,000
Beginning balance at Mar. 31, 2020	706,352			1,038,544	(333,896)	1,407			$ 154			$ 143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition	717
Issuance of common stock upon exercise of stock options (in shares)									0			1,079,000
Issuance of common stock upon exercise of stock options	1,660			1,659					$ 0			$ 1
Repurchases of unvested common stock (in shares)										(8,000)
Issuance of common stock related to early exercised stock options (in shares)												21,000
Vesting of shares issued upon early exercise of stock options	1,288			1,287								$ 1
Issuance of common stock related to settlement of RSUs (in shares)									50,000			522,000
Issuance of common stock related to settlement of RSUs	1			0								$ 1
Tax withholding on RSU settlement (in shares)									0			(5,000)
Tax withholding on RSU settlement	(193)			(193)
Conversion of Class B to Class A common stock (in shares)										29,828,000			29,828,000
Conversion of Class B to Class A common stock		$ 0								$ 30			$ (30)
Equity component of convertible senior notes, net of issuance costs	200,812			200,812
Purchases of capped calls related to convertible senior notes	(67,333)			(67,333)
Common stock issued under employee stock purchase plan (in shares)									421,000
Common stock issued under employee stock purchase plan	5,447			5,447
Tax withholding on common stock issued under employee stock purchase plan (in shares)									(13,000)
Tax withholding on common stock issued under employee stock purchase plan	(376)			(376)
Stock-based compensation	13,561			13,561
Net loss	(26,135)				(26,135)				$ (14,773)			$ (11,362)
Other comprehensive income (loss)	(183)					(183)
Ending balance (in shares) at Jun. 30, 2020								184,900,249	184,900,000		120,523,936	120,524,000
Ending balance at Jun. 30, 2020	$ 835,618			$ 1,194,125	$ (360,031)	$ 1,224			$ 184			$ 116

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows From Operating Activities
Net loss	$ (58,881)	$ (36,820)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization expense	22,113	13,160
Non-cash operating lease costs	9,332	0
Amortization of deferred contract acquisition costs	7,462	4,904
Stock-based compensation expense	25,346	2,101
Net accretion of discounts and amortization of premiums on available-for-sale securities	(367)	(852)
Amortization of debt discount and issuance costs	4,303	0
Deferred income taxes	(2,621)	0
Provision for bad debt	2,493	451
Change in fair value of redeemable convertible preferred stock warrant liability	0	327
Other	(95)	9
Changes in operating assets and liabilities, net of effect of acquisitions:
Accounts receivable, net	(12,272)	(5,222)
Contract assets	(161)	(153)
Deferred contract acquisition costs	(16,158)	(8,446)
Prepaid expenses and other current assets	(171)	(314)
Other noncurrent assets	(894)	(1,373)
Accounts payable	4,333	4,887
Accrued expenses and other current liabilities	4,179	920
Operating lease liabilities	(10,205)	0
Deferred revenue	13,371	10,727
Other noncurrent liabilities	(1,396)	3,137
Net cash used in operating activities	(10,289)	(12,557)
Cash Flows From Investing Activities
Purchases of property and equipment	(30,605)	(18,990)
Capitalized internal-use software	(9,863)	(7,471)
Cash paid for acquisitions, net of cash acquired	(13,691)	0
Purchases of available-for-sale securities	(579,437)	(45,143)
Sales of available-for-sale securities	0	1,978
Maturities of available-for-sale securities	323,832	97,448
Other investing activities	223	25
Net cash provided by (used in) investing activities	(309,541)	27,847
Cash Flows From Financing Activities
Gross proceeds from issuance of convertible senior notes	575,000	0
Purchases of capped calls related to convertible senior notes	(67,333)	0
Cash paid for issuance costs on convertible senior notes	(12,520)	0
Proceeds from the exercise of stock options	4,335	1,067
Proceeds from the early exercise of stock options	80	2,174
Repurchases of unvested common stock	(101)	(88)
Payments on note payable	(200)	(182)
Proceeds from the issuance of common stock for employee stock purchase plan	5,447	0
Proceeds from build-to-suit lease financing obligation drawdown	0	47
Payments of deferred offering costs	0	(969)
Net cash provided by financing activities	497,024	2,049
Net increase (decrease) in cash, cash equivalents, and restricted cash	177,194	17,339
Cash, cash equivalents, and restricted cash, beginning of period	145,636	31,426
Cash, cash equivalents, and restricted cash, end of period	322,830	48,765
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest	34	289
Cash paid for income taxes, net of refunds	30	916
Cash paid for operating lease liabilities	9,944	0
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Stock-based compensation capitalized for software development	1,632	143
Accounts payable and accrued expenses related to property and equipment additions	4,651	2,229
Vesting of early exercised stock options	2,511	1,438
Deferred offering costs, accrued but not paid	0	1,958
Indemnity holdback consideration associated with business combinations	2,188	0
Issuance of common stock related to an acquisition	1,821	0
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	4,607	0
Derecognition of build-to-suit lease	9,886	0
Restricted Stock Units (RSUs)
Cash Flows From Financing Activities
Payment of tax withholding obligation	(7,308)	0
Shares issuable pursuant to the ESPP
Cash Flows From Financing Activities
Payment of tax withholding obligation	$ (376)	$ 0

Organization and Basis of Presentation	6 Months Ended
Organization and Basis of Presentation	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization and Description of Business Cloudflare, Inc. (the Company, Cloudflare, we, us, or our) has built a global cloud platform that delivers a broad range of network services to businesses of all sizes and geographies, making them more secure, enhancing the performance of their business-critical applications, and eliminating the cost and complexity of managing individual network hardware. Cloudflare provides businesses with a scalable, easy-to-use, unified control plane to deliver security, performance, and reliability across their on-premise, hybrid, cloud, and software-as-a-service (SaaS) applications. The Company was incorporated in Delaware in July 2009. The Company is headquartered in San Francisco, California. Basis of Presentation and Principles of Consolidation The accompanying interim condensed consolidated financial statements and accompanying notes have been prepared in conformity with generally accepted accounting principles in the United States (U.S. GAAP) and applicable regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting, and include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company’s fiscal year ends on December 31. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable required disclosures and regulations of the SEC. Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019. Initial Public Offering In September 2019, the Company completed an Initial Public Offering (IPO) in which it issued and sold 40,250,000 shares of Class A common stock, which included 5,250,000 shares sold pursuant to the exercise by the underwriters of an option to purchase additional shares, at the public offering price of $15.00 per share. The Company received net proceeds of $565.0 million from sales of its shares in the IPO, after deducting underwriting discounts and commissions and offering costs. Upon completion of the IPO, 31,381,152 shares of redeemable convertible preferred stock were automatically converted into an equal number of shares of Class A common stock, 134,276,690 shares of redeemable convertible preferred stock were automatically converted into an equal number of shares of Class B common stock, outstanding warrants to purchase shares of redeemable convertible preferred stock were automatically converted into outstanding warrants to purchase shares of Class B common stock, and 15,198,587 shares of Class B common stock held by former employees were automatically converted into an equal number of shares of Class A common stock. Unaudited Interim Condensed Consolidated Financial Information The accompanying interim condensed consolidated balance sheet as of June 30, 2020, the condensed consolidated statements of operations and of comprehensive loss for the three and six months ended June 30, 2020 and 2019, the condensed consolidated statements of cash flows for the six months ended June 30, 2020 and 2019, the condensed consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit) for the three and six months ended June 30, 2020 and 2019, and the related footnote disclosures are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. GAAP. In management’s opinion, the unaudited interim condensed consolidated financial statements include all adjustments necessary to state fairly the Company’s financial position as of June 30, 2020, its results of operations for the three and six months ended June 30, 2020 and 2019, and its cash flows for the six months ended June 30, 2020 and 2019. The results for the three and six months ended June 30, 2020 are not necessarily indicative of the results expected for the full year ending December 31, 2020 or any future period. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes to the condensed consolidated financial statements. Such estimates include, but are not limited to, allowance for doubtful accounts, deferred contract acquisitions costs, the period of benefit generated from the Company’s deferred contract acquisition costs, the capitalization and estimated useful life of internal-use software, the assessment of recoverability of intangible assets and their estimated useful lives, useful lives of property and equipment, liability and equity allocation of convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation and recognition of stock-based compensation expense, uncertain tax positions, and the recognition and measurement of current and deferred income tax assets and liabilities. Management bases these estimates and assumptions on historical experience and on various other assumptions that management believes to be reasonable. Due to the COVID-19 pandemic, there is ongoing uncertainty and significant disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or assumptions or a revision of the carrying value of its assets or liabilities as of August 10, 2020, the date of issuance of this Quarterly Report on Form 10-Q. These estimates and assumptions may change in the future, however, as new events occur and additional information is obtained. Actual results could differ materially from these estimates.

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Significant Accounting Policies The Company's significant accounting policies are discussed in the "Notes to Consolidated Financial Statements, Note 2. Summary of Significant Accounting Policies" in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019. There have been no significant changes to these policies that have had a material impact on the Company's condensed consolidated financial statements and related notes, except as noted below. Operating Leases The Company enters into operating lease arrangements for real estate assets related to office space and for co-location assets related to space and equipment located in co-location facilities. The Company determines if an arrangement contains a lease at its inception by assessing whether there is an identified asset and whether the arrangement conveys the right to control the use of the identified asset in exchange for consideration. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, and operating lease liabilities, noncurrent in the Company's condensed consolidated balance sheets. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make payments arising from the lease. The Company's operating lease arrangements contain both lease and non-lease components. Operating lease right-of-use assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. Lease payments consist of the fixed payments under the arrangement, less any lease incentives such as tenant improvement allowances. Variable lease costs, such as lease payments that depend on an index or a rate, are expensed as incurred and not included within the calculation of right-of-use assets and lease liabilities. At inception of an arrangement, the Company allocates the consideration to the lease and non-lease components and recognizes a right-of-use asset and corresponding lease liability for each lease component. As the implicit rate of the Company's leases is not determinable, the Company uses an incremental borrowing rate (IBR) based on the information available at the lease commencement date in determining the present value of lease payments. The lease expense is recognized on a straight-line basis over the lease term. The Company generally uses the base, non-cancelable lease term when recognizing the right-of-use assets and lease liabilities, unless it is reasonably certain that a renewal or termination option will be exercised. Leases with a term of twelve months or less are not recognized on the consolidated balance sheets. The Company recognizes lease expense for these leases on a straight-line basis over the term of the lease. Business Combinations The Company includes the results of operations of the businesses that the Company acquires from the date of acquisition. The fair value of the assets acquired and liabilities assumed is based on their estimated fair values as of the respective date of acquisition. The excess purchase price over the fair value of the net assets acquired and liabilities assumed is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment and estimates including the selection of valuation methodologies, future expected cash flows, discount rates, and useful lives. The Company’s estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill. At the conclusion of the measurement period, or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the condensed consolidated statements of operations. When the Company issues payments or grants of equity to selling stockholders in connection with an acquisition, the Company evaluates whether the payments or awards are compensatory. This evaluation includes whether cash payments or stock award vesting is contingent on the continued employment of the selling stockholder beyond the acquisition date. If continued employment is required for the cash to be paid or stock awards to vest, the award is treated as compensation for post-acquisition services and is recognized as compensation expense. Transaction costs associated with business combinations are expensed as incurred and are included in general and administrative expense in the Company’s condensed consolidated statements of operations. Convertible Senior Notes The Company accounts for its 0.75% Convertible Senior Notes due May 2025 (the Notes) as separate liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion option, is calculated by deducting the fair value of the liability component from the total principal of the convertible notes. The excess of the principal amount of the liability component over its book value (debt discount) is amortized to interest expense over the term of the Notes. In accounting for the issuance costs related to the Notes, the allocation of issuance costs incurred between the liability and equity components was based on their relative values. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842), and since that date, has issued several ASUs to further clarify certain aspects of ASU 2016-02 and provide entities with practical expedients that may be elected upon adoption. The Company adopted the new standard beginning January 1, 2020 using the modified retrospective approach, electing the optional transition approach of not adjusting the comparative period financial statements for the impact of adoption. The Company elected the package of practical expedients permitted under the transition guidance, which allows the Company to carryforward its historical lease classification, its assessment on whether a contract is or contains a lease, and its initial direct costs for any leases that existed prior to adoption of the new standard. In addition, the Company elected not to recognize lease liabilities and related right-of-use assets for leases that, at the lease commencement date, have a lease term of 12 months or less. Adoption of the new standard on January 1, 2020 resulted in the recognition of $50.0 million of operating lease right-of-use assets and $52.8 million of total operating lease liabilities on the Company's condensed consolidated balance sheets. As part of the adoption, the Company also derecognized deferred rent of $2.8 million, primarily consisting of the noncurrent portion, net build-to-suit assets of $9.9 million, the build-to-suit lease financing obligation of $10.5 million, and recorded a cumulative-effect adjustment of $0.6 million to accumulated deficit as of January 1, 2020. Refer to Note 6 to these condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. This ASU changes the methodology for measuring credit losses and requires the establishment of an allowance for estimated credit losses on financial assets, including trade and other receivables, at each reporting date. The Company adopted ASU 2016-13 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (ASC 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement. This guidance provides that implementation costs be evaluated for capitalization using the same criteria as that used for internal-use software development costs, with amortization expense being recorded in the same income statement expense line as the hosted service costs and over the expected term of the hosting arrangement. For public business entities, it is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. For all other entities, it is effective for fiscal years beginning after December 15, 2020, and interim periods beginning after December 15, 2021. Early adoption of the amendments in this update is permitted, including adoption in any interim period, for all entities. The Company adopted ASU 2018-15 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In November 2019, the FASB issued ASU 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842). This ASU revises, and staggers, the effective dates for various major updates that have been issued since 2014 to alleviate the burden on both larger public companies as well as private companies, smaller public companies, not-for-profit organizations, and employee benefit plans. The Company adopted ASU 2019-10 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (ASC Topic 740). This ASU simplifies accounting for income taxes by removing certain exceptions to the general principles and amending existing guidance to improve consistent application. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company adopted ASU 2019-12 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. Recently Issued Accounting Pronouncements There have been no recent accounting pronouncements since the filing of the Company's Annual Report on Form 10-K for the year ended December 31, 2019, that may have a material impact on the Company's condensed consolidated financial statements.

Revenue

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue

Revenue Recognition

In accordance with ASC 606, revenue is recognized when a customer obtains control of promised services. The amount of revenue recognized reflects the consideration that the Company expects to be entitled to receive in exchange for these services. To achieve this standard, the Company applies the following five steps:

1. Identify the contract with a customer

The Company considers the terms and conditions of the contracts and its customary business practices in identifying its contracts under ASC 606. The Company determines it has a contract with a customer when the contract is approved, the Company can identify each party’s rights regarding the services to be transferred, the Company can identify the payment terms, the Company has determined that collectibility is probable, and the contract has commercial substance. The Company applies judgment in determining that collectibility is probable, which is based on a variety of factors, including the customer’s historical payment experience or, in the case of a new customer, credit and financial information relevant to the customer.

2. Identify the performance obligations in the contract

Performance obligations promised in a contract are identified based on the services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the service either on its own or together with other resources that are readily available to the Company, and are distinct in the context of the contract, whereby the transfer of the services is separately identifiable from other promises in the contract. The Company’s performance obligation primarily consists of subscription and support services, as they are provided over the same service period.

3. Determine the transaction price

The transaction price is determined based on the consideration to which the Company expects to be entitled in exchange for transferring services to the customer. Usage-based variable consideration is recognized in the period it is incurred. None of the Company’s contracts contain a significant financing component.

4. Allocate the transaction price to performance obligations in the contract

The subscription and support services in the Company’s contracts are considered a single performance obligation, and thus the entire transaction price is allocated to the single performance obligation.

5. Recognize revenue when or as the Company satisfies a performance obligation

Revenue is recognized at the time the related performance obligation is satisfied by transferring the service to a customer. Revenue is recognized when control of the services is transferred to the Company’s customers, in an amount that reflects the consideration that the Company expects to be entitled to receive in exchange for those services.

The Company generates sales directly through its sales team and through its channel partners. Revenue from sales to channel partners are recorded once all revenue recognition criteria above are met. Channel partners generally receive an order from an end-customer prior to placing an order with the Company. Payment from channel partners is not contingent on the partner’s collection from end-customers. The Company has determined that it is acting as an agent in these arrangements and records this revenue on a net basis.

Subscription and Support Revenue

The Company generates revenue primarily from sales to its customers of subscriptions to access its platform, together with related support services. Arrangements with customers generally do not provide the customer with the right to take possession of the Company’s software operating its global cloud platform at any time. Instead, customers are granted continuous access to the Company’s global cloud platform over the contractual period. Access to the Company’s platform and products is considered a monthly series comprising one performance obligation. A time-elapsed output method is used to measure progress because the Company transfers control evenly over the contractual period. Accordingly, the fixed consideration related to subscription and support revenue is generally recognized on a straight-line basis over the contract term beginning on the date that the Company’s service is made available to the customer. Usage-based consideration is primarily related to fees charged for the Company’s customer’s use of excess bandwidth when accessing the Company’s platform in a given period and is recognized as revenue in the period in which the usage occurs.

The typical subscription and support term for the Company’s contracted customers, which consist of customers that enter into contracts for the Company's Enterprise subscription plan (and which the Company previously referred to as enterprise customers), is one year and subscription and support term lengths range from one to three years. Most of the Company’s contracts with contracted customers are non-cancelable over the contractual term. Customers typically have the right to terminate their contracts for cause if the Company fails to perform in accordance with the contractual terms. For the Company’s pay-as-you-go customers, which consist of customers that sign up for the Company's Pro or Business subscription plans through the Company's website (and which the Company previously referred to as self-serve customers), subscription and support terms are typically monthly.

Variable Consideration

If the Company’s services do not meet certain service level commitments, its customers are entitled to receive service credits, and in certain cases, refunds, each representing a form of variable consideration. Revenue from sales is recorded at the net sales price, which is the transaction price, and includes estimates of these forms of variable consideration to the extent that a significant reversal of cumulative revenue will not occur in a future period. The Company has historically not experienced any incidents that had a material impact on its consolidated financial statements. Accordingly, any estimated refunds related to these agreements in the condensed consolidated financial statements are not material during the periods presented. Usage-based consideration is primarily related to fees charged for the Company’s customer’s use of excess bandwidth when accessing the Company’s platform in a given period and is recognized as revenue in the period in which the usage occurs.

Disaggregation of Revenue

Subscription and support revenue is recognized over time and accounted for substantially all of the Company’s revenue for the three and six months ended June 30, 2020 and 2019.

The following table summarizes the revenue by region based on the billing address of customers who have contracted to use the Company’s global cloud platform:


	Three Months Ended June 30,														Six Months Ended June 30,
	2020						2019						2020				2019

	(in thousands)
	Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue
United States	$	48,478	49	%	$	33,227	49	%	$	92,693	49	%	$	63,966	50	%
Europe, Middle East, and Africa	25,912		26	%	15,997		24	%	49,018		26	%	30,623		24	%
Asia Pacific	18,589		19	%	13,610		20	%	36,193		19	%	25,789		20	%
Other	6,742		6	%	4,590		7	%	13,067		6	%	8,773		6	%
Total	$	99,721	100	%	$	67,424	100	%	$	190,971	100	%	$	129,151	100	%

The following table summarizes the revenue from contracts by type of customer:


	Three Months Ended June 30,														Six Months Ended June 30,
	2020						2019						2020				2019

	(in thousands)
	Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue
Channel partners	$	10,153	10	%	$	5,663	8	%	$	19,312	10	%	$	11,859	9	%
Direct customers	89,568		90	%	61,761		92	%	171,659		90	%	117,292		91	%
Total	$	99,721	100	%	$	67,424	100	%	$	190,971	100	%	$	129,151	100	%

Contract Balances

Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue over the contractual period. For the six months ended June 30, 2020 and 2019, the Company recognized revenue of $26.8 million and $13.1 million, respectively, that was included in the corresponding contract liability balance at the beginning of the periods presented.

The Company receives payments from customers based upon contractual billing schedules; accounts receivable are recorded when the right to consideration becomes unconditional. Standard payment terms are due upon receipt. Contract assets include amounts related to the Company’s contractual right to consideration for both completed and partially completed performance obligations that have not been invoiced.

Costs to Obtain and Fulfill a Contract

The Company capitalizes sales commission and associated payroll taxes paid to internal sales personnel that are incremental to the acquisition of channel partner and direct customer contracts. These costs are recorded as deferred contract acquisition costs on the condensed consolidated balance sheets. The Company determines whether costs should be deferred based on its sales compensation plans, if the commissions are in fact incremental and would not have occurred absent the customer contract.

Sales commissions for renewal of a contract are not considered commensurate with the commissions paid for the acquisition of the initial contract. Commissions paid upon the initial acquisition of a contract are amortized over an estimated period of benefit of three years while commissions paid for renewal contracts are amortized over the contractual term of the renewals. Amortization of deferred contract acquisition costs is recognized on a straight-line basis commensurate with the pattern of revenue recognition and included in sales and marketing expense in the condensed consolidated statements of operations. The Company determines the period of benefit for commissions

paid for the acquisition of the initial contract by taking into consideration the expected subscription term and expected renewals of its customer contracts, the duration of its relationships with its customers, customer retention data, its technology development lifecycle, and other factors. The Company periodically reviews the carrying amount of deferred contract acquisition costs to determine whether events or changes in circumstances have occurred that could impact the period of benefit of these deferred costs. The Company did not recognize any impairment losses of deferred contract acquisition costs during the periods presented.

The following table summarizes the activity of the deferred contract acquisition costs:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Beginning balance	$	28,171	$	17,846	$	25,184	$	15,940
Capitalization of contract acquisition costs	9,672		4,221		16,158		8,446
Amortization of deferred contract acquisition costs	(3,963)		(2,585)		(7,462)		(4,904)
Ending balance	$	33,880	$	19,482	$	33,880	$	19,482

Remaining Performance Obligations

As of June 30, 2020, the aggregate amount of the transaction price allocated to remaining performance obligations was $274.0 million. As of June 30, 2020, the Company expected to recognize 82% of its remaining performance obligations as revenue over the next 12 months and 18% of its remaining performance obligations as revenue over the next three years.

Fair Value Measurements

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair value is defined as the exchange price that would be received from sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

Assets and liabilities measured at fair value are classified into the following categories:

•Level I: Observable inputs are unadjusted quoted prices in active markets for identical assets or liabilities;

•Level II: Observable inputs are quoted prices for similar assets and liabilities in active markets or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments; and

•Level III: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs are based on the Company’s own assumptions used to measure assets and liabilities at fair value and require significant management judgment or estimation.

The Company's cash equivalents are comprised of highly liquid money market funds and commercial paper. The Company classifies money market funds within Level I of the fair value hierarchy because they are valued based on quoted market prices in active markets. The Company classifies its investments, which are comprised of U.S. treasury securities, U.S. government agency securities, commercial paper, and corporate bonds, within Level II of the fair value hierarchy because the fair value of these securities is priced by using inputs based on non-binding market consensus prices that are primarily corroborated by observable market data or quoted market prices for similar instruments. The Company recognizes transfers between levels within the fair value hierarchy, if any, at the end of each period. There were no transfers between levels during the periods presented.

The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash, or available-for-sale securities as of June 30, 2020 and December 31, 2019.


(in thousands)									Reported as:
June 30, 2020	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Long- term Restricted Cash
Cash	$	17,036	$	—	$	—	$	17,036	$	14,849	$	—	$	2,187
Level I:
Money market funds	251,805		—		—		251,805		245,145		—		6,660
Level II:
Corporate bonds	137,047		404		(13)		137,438		—		137,438		—
U.S. treasury securities	495,473		905		(16)		496,362		—		496,362		—
U.S. government agency securities	50,866		26		(6)		50,886		—		50,886		—
Commercial paper	124,410		1		—		124,411		53,989		70,422		—
Subtotal	807,796		1,336		(35)		809,097		53,989		755,108		—
Total assets measured at fair value on a recurring basis	$	1,076,637	$	1,336	$	(35)	$	1,077,938	$	313,983	$	755,108	$	8,847


(in thousands)									Reported as:
December 31, 2019	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Long-term Restricted Cash
Cash	$	24,631	$	—	$	—	$	24,631	$	24,631	$	—	$	—
Level I:
Money market funds	32,856		—		—		32,856		26,196		—		6,660
Level II:
Corporate bonds	84,054		22		(30)		84,046		—		84,046		—
U.S. treasury securities	311,083		151		(23)		311,211		—		311,211		—
U.S. government agency securities	95,380		17		—		95,397		22,549		72,848		—
Commercial paper	95,467		—		—		95,467		65,600		29,867		—
Subtotal	585,984		190		(53)		586,121		88,149		497,972		—
Total assets measured at fair value on a recurring basis	$	643,471	$	190	$	(53)	$	643,608	$	138,976	$	497,972	$	6,660

The aggregate fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of June 30, 2020 and December 31, 2019. Realized gains and losses, net of tax, were not material for any of the periods presented.

The amortized cost of available-for-sale investments with maturities less than one year was $677.2 million and $450.2 million as of June 30, 2020 and December 31, 2019, respectively. The amortized cost of available-for-sale investments with maturities greater than one year was $76.6 million and $47.7 million as of June 30, 2020 and December 31, 2019, respectively.

As of June 30, 2020, net unrealized gains on investments were $1.2 million net of tax and were included in accumulated other comprehensive income on the condensed consolidated balance sheets. As of December 31, 2019, net unrealized gains on investments were $0.1 million net of tax and were included in accumulated other comprehensive income on the condensed consolidated balance sheets. The unrealized gains and losses on available-for-sale investments are related to U.S. treasury securities, U.S. government agency securities, commercial paper, and corporate bonds. The Company determined any unrealized losses to be temporary. Factors considered in determining whether a loss is temporary include the financial condition and near-term prospects of the investee, the extent of the loss related to the credit of the issuer, the expected cash flows from the security, the Company’s intent to sell the security, and whether or not the Company will be required to sell the security before the

recovery of its amortized cost. As of June 30, 2020, the Company's investment portfolio consisted of investment grade securities with an average credit rating of AA+.

The Company carries the Notes issued in May 2020 at face value less the unamortized discount and issuance costs on its condensed consolidated balance sheets and presents that fair value for disclosure purposes only. As of June 30, 2020, the fair value of the Notes was $677.3 million. The fair value of the Notes, which are classified as Level II financial instruments, was determined based on the quoted bid prices of the Notes in an over-the-counter market on the last trading day of the reporting period. For further details on the Notes, refer to Note 7 to these condensed consolidated financial statements.

The Company classifies financial instruments in Level III of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level III financial instruments typically also rely on a number of inputs that are readily observable, either directly or indirectly. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability. Prior to the IPO, the Company's only Level III financial instruments were its redeemable convertible preferred stock warrants. Upon the completion of the IPO, the warrant to purchase shares of Series B redeemable convertible preferred stock was converted into a warrant to purchase shares of Class B common stock. As a result, the warrant liability was remeasured and reclassified to additional paid-in capital within stockholders' equity (deficit). For further details, refer to Note 9 to these condensed consolidated financial statements. There were no material financial instruments classified as Level III of the fair value hierarchy as of June 30, 2020 and December 31, 2019.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Balance Sheet Components

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balance Sheet Components

Accounts Receivable, Net

As of June 30, 2020 and December 31, 2019, the Company’s allowance for doubtful accounts was $1.6 million and $0.5 million, respectively. Bad debt expense for the three months ended June 30, 2020 and 2019 was $0.3 million and $0.2 million, respectively and $2.5 million and $0.5 million for the six months ended June 30, 2020 and 2019, respectively. For the three months ended June 30, 2020 and 2019, write-off of uncollectible accounts receivable was $0.9 million and $0.1 million, respectively, and $1.4 million and $0.1 million for the six months ended June 30, 2020 and 2019, respectively.

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Prepaid expenses	$	10,163	$	10,913
Deposits	3,342		2,773
Other	3,658		3,308
Total prepaid expenses and other current assets	$	17,163	$	16,994

Property and Equipment, Net

Property and equipment, net consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Property and equipment:
Servers—network infrastructure	$	102,183	$	84,979
Buildings	—		13,035
Construction in progress	15,706		8,692
Capitalized internal-use software	42,666		31,171
Office and computer equipment	17,886		13,528
Office furniture	6,478		6,124
Software	1,331		1,025
Leasehold improvements	11,628		9,870
Asset retirement obligation	429		231
Gross property and equipment	198,307		168,655
Less accumulated depreciation and amortization	(83,758)		(67,189)
Total property and equipment, net	$	114,549	$	101,466

In connection with the adoption of ASC 842, the Company derecognized the building asset of $13.0 million as of January 1, 2020, which was initially recorded as a result of build-to-suit lease accounting and reclassified a portion of the balance, $1.6 million, to leasehold improvements. This amount reflects the lessee-owned assets of the construction project and is being depreciated over the remaining lease term. For further details on the adoption of ASC 842, refer to Note 2 to these condensed consolidated financial statements.

Depreciation and amortization expense on property and equipment for the three months ended June 30, 2020 and 2019 was $10.8 million and $7.0 million, respectively, and $20.7 million and $13.1 million for the six months ended June 30, 2020 and 2019, respectively. This includes amortization expense for capitalized internal-use software which totaled $2.8 million and $1.5 million for the three months ended June 30, 2020 and 2019, respectively, and $5.3 million and $2.8 million for the six months ended June 30, 2020 and 2019, respectively.

Goodwill

As of June 30, 2020 and December 31, 2019, the Company's goodwill was $17.2 million and $4.1 million, respectively. During the six months ended June 30, 2020, the Company recorded $13.1 million of goodwill in connection with the acquisition of S2 Systems Corporation (S2). For further detail on the acquisition, refer to Note 14 to these condensed consolidated financial statements. No goodwill impairments were recorded during the six months ended June 30, 2020 and 2019.

Acquired Intangible Assets, Net

Acquired intangible assets, net consisted of the following:


	June 30, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	5,600	$	1,400	$	4,200
Total acquired intangible assets, net	$	5,600	$	1,400	$	4,200


	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	250	$	219	$	31
Total acquired intangible assets, net	$	250	$	219	$	31

During the six months ended June 30, 2020, the Company recorded $5.6 million of developed technology in connection with the acquisition of S2. For further details on the acquisition, refer to Note 14 to these condensed consolidated financial statements.

Amortization of acquired intangible assets for the three months ended June 30, 2020 and 2019 was $0.7 million and zero, respectively, and $1.4 million and $0.1 million for the six months ended June 30, 2020 and 2019, respectively.

As of June 30, 2020, the estimated future amortization expense of acquired intangible assets was as follows:


	Estimated Amortization
	(in thousands)
Year ending December 31,
2020 (remaining six months)	$	1,400
2021	2,800
Total	$	4,200

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Accrued compensation and benefits	$	20,242	$	14,970
Accrued expenses	3,904		5,331
Customer refunds and credits	1,670		3,328
Accrued co-location and bandwidth	2,831		2,696
Other	3,429		1,989
Total accrued expenses and other current liabilities	$	32,076	$	28,314

Other Noncurrent Liabilities

Other noncurrent liabilities consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Accrued taxes	$	5,325	$	4,862
Deferred rent	—		2,342
Other	3,948		2,599
Total other noncurrent liabilities	$	9,273	$	9,803

In connection with the adoption of ASC 842, the Company derecognized the deferred rent as of January 1, 2020. For further details on the adoption of ASC 842, refer to Note 2 to these condensed consolidated financial statements.

Leases

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Leases

The Company's lease portfolio consists of real estate and co-location agreements in the U.S. and internationally. The real estate leases include leases for office space and have remaining lease terms of up to 4.5 years. Certain of these leases contain options that allow the Company to extend or terminate the lease agreement. The Company's co-location leases have remaining lease terms of up to 4.6 years. All of the Company's leases are classified as operating leases.

The Company also subleases one of its leased office spaces. The sublease has a remaining lease term of 0.9 years. Sublease income, which is recorded as a reduction of rent expense was $0.7 million and $0.3 million for the three months ended June 30, 2020 and 2019, respectively, and $1.4 million and $0.3 million for the six months ended June 30, 2020 and 2019, respectively.

The components of lease cost related to the Company's operating leases included in the condensed consolidated statements of operations were as follows:


	Three Months Ended June 30,		Six Months Ended June 30,

	2020
	(in thousands)
Operating lease cost	$	4,789	$	9,332
Sublease income	(710)		(1,417)
Total lease cost	$	4,079	$	7,915

Variable lease cost and short-term lease cost for the three and six months ended June 30, 2020 were not material.

As of June 30, 2020, the Company had $20.2 million of total undiscounted future payments under operating leases that have not yet commenced, which were not included on the condensed consolidated balance sheets. These operating leases will commence between July 2020 and October 2024 and have an average lease term of 3.3 years.

As of June 30, 2020, the weighted-average remaining term of the Company’s operating leases was 3.1 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 3.3%.

Maturities of the operating lease liabilities as of June 30, 2020 are as follows:


	June 30, 2020
	(in thousands)
2020 (remaining six months)	$	8,985
2021	17,742
2022	13,131
2023	6,944
2024	3,662
Thereafter	2
Total lease payments	$	50,466
Less: Imputed interest	$	(2,358)
Total operating lease liabilities	$	48,108

Prior to the Company's adoption of ASC 842, future minimum operating lease payments as of December 31, 2019 were as follows:


	December 31, 2019
	(in thousands)
2020	$	18,618
2021	16,942
2022	12,423
2023	6,410
2024	4,474
Thereafter	10,304
Total lease payments	$	69,171

The amounts above include the build-to-suit lease.

Prior to the Company's adoption of ASC 842, the Company recognized rent expense on a straight-line basis over the lease period. The difference between the rent paid and the straight-line rent was recorded as deferred rent, which was included in accrued expenses and other current liabilities and other noncurrent liabilities on the condensed consolidated balance sheets. Rent expense was $2.7 million and $5.3 million for the three and six months ended June 30, 2019, respectively.

Leases

The Company's lease portfolio consists of real estate and co-location agreements in the U.S. and internationally. The real estate leases include leases for office space and have remaining lease terms of up to 4.5 years. Certain of these leases contain options that allow the Company to extend or terminate the lease agreement. The Company's co-location leases have remaining lease terms of up to 4.6 years. All of the Company's leases are classified as operating leases.

The Company also subleases one of its leased office spaces. The sublease has a remaining lease term of 0.9 years. Sublease income, which is recorded as a reduction of rent expense was $0.7 million and $0.3 million for the three months ended June 30, 2020 and 2019, respectively, and $1.4 million and $0.3 million for the six months ended June 30, 2020 and 2019, respectively.

The components of lease cost related to the Company's operating leases included in the condensed consolidated statements of operations were as follows:


	Three Months Ended June 30,		Six Months Ended June 30,

	2020
	(in thousands)
Operating lease cost	$	4,789	$	9,332
Sublease income	(710)		(1,417)
Total lease cost	$	4,079	$	7,915

Variable lease cost and short-term lease cost for the three and six months ended June 30, 2020 were not material.

As of June 30, 2020, the Company had $20.2 million of total undiscounted future payments under operating leases that have not yet commenced, which were not included on the condensed consolidated balance sheets. These operating leases will commence between July 2020 and October 2024 and have an average lease term of 3.3 years.

As of June 30, 2020, the weighted-average remaining term of the Company’s operating leases was 3.1 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 3.3%.

Maturities of the operating lease liabilities as of June 30, 2020 are as follows:


	June 30, 2020
	(in thousands)
2020 (remaining six months)	$	8,985
2021	17,742
2022	13,131
2023	6,944
2024	3,662
Thereafter	2
Total lease payments	$	50,466
Less: Imputed interest	$	(2,358)
Total operating lease liabilities	$	48,108

Prior to the Company's adoption of ASC 842, future minimum operating lease payments as of December 31, 2019 were as follows:


	December 31, 2019
	(in thousands)
2020	$	18,618
2021	16,942
2022	12,423
2023	6,410
2024	4,474
Thereafter	10,304
Total lease payments	$	69,171

The amounts above include the build-to-suit lease.

Prior to the Company's adoption of ASC 842, the Company recognized rent expense on a straight-line basis over the lease period. The difference between the rent paid and the straight-line rent was recorded as deferred rent, which was included in accrued expenses and other current liabilities and other noncurrent liabilities on the condensed consolidated balance sheets. Rent expense was $2.7 million and $5.3 million for the three and six months ended June 30, 2019, respectively.

Debt

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Debt

Convertible Senior Notes

In May 2020, the Company issued $575.0 million aggregate principal amount of the Notes in a private offering to qualified institutional buyers pursuant to Rule 144A promulgated under the Securities Act, including the initial purchasers' exercise in full of their option to purchase an additional $75.0 million aggregate principal amount of the Notes. The total net proceeds from the issuance of the Notes, after deducting initial purchaser discounts and debt issuance costs, were $562.5 million.

The Notes are senior unsecured obligations of the Company and will mature on May 15, 2025, unless earlier redeemed, repurchased, or converted, and are governed by the terms of the Indenture dated May 15, 2020 (the Indenture). Interest is payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2020, at a rate of 0.75% per year.

The Notes are convertible at an initial conversion rate of 26.7187 shares of the Company's Class A common stock per $1,000 principal amount of the Notes, which is equivalent to an initial conversion price of approximately $37.43 per share, subject to adjustment upon the occurrence of specified events. The Notes may be converted at any time on or after February 15, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date. Holders of the Notes may convert all or any portion of their Notes at their option at any time prior to the close of business on the business day immediately preceding February 15, 2025 only under the following circumstances:

•during any calendar quarter commencing after the calendar quarter ending on September 30, 2020 (and only during such calendar quarter), if the last reported sale price of the Company's Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's Class A common stock and the conversion rate on each such trading day;

•if the Company calls such Notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or

•upon the occurrence of specified corporate events.

In addition, if the Notes are converted prior to the maturity date following certain specified corporate events or because the Company issues a notice of redemption, the Company will increase the conversion rate for such Notes converted in connection with such a corporate event or during the related redemption period, as the case may be, in certain circumstances.

Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company's Class A common stock, or a combination of cash and shares of the Company's Class A common stock, at the Company's election. It is the Company’s current intent to settle the principal amount of Notes with cash.

The Company may not redeem the Notes prior to May 20, 2023. The Company may redeem for cash all or any portion of the Notes, at its option, on or after May 20, 2023, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Notes.

If the Company undergoes a fundamental change (as defined in the Indenture), holders of the Notes may require the Company to repurchase for cash all or any portion of their notes at a fundamental change repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In accounting for the issuance of the Notes, the Company separated the Notes into liability and equity components. The carrying amount of the liability component was calculated by using an effective interest rate of 10.0%, which was determined by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option and recorded in additional paid-in capital was $205.3 million and was determined by deducting the fair value of the liability component from the par value of the Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount represents a debt discount that is amortized to interest expense using the effective interest rate method over the contractual term of the Notes.

In accounting for the issuance costs related to the Notes, the Company allocated the total amount incurred to the liability and equity components based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were $8.0 million (presented as a reduction to the carrying amount of debt) and are being amortized to interest expense over the contractual term of the Notes. The issuance costs attributable to the equity component were $4.5 million and are netted against the equity component in additional paid-in capital.

The net carrying amount of the liability component of the Notes was as follows:


	June 30, 2020
	(in thousands)
Principal	$	575,000
Unamortized debt discount	(201,193)
Unamortized debt issuance costs	(7,858)
Carrying amount of the liability component, net	$	365,949

The net carrying amount of the equity component of the Notes was as follows:


	June 30, 2020
	(in thousands)
Proceeds allocated to the conversion option (debt discount)	$	205,290
Less: allocated issuance costs	(4,478)
Carrying amount of the equity component, net	$	200,812

As of June 30, 2020, the if-converted value of the Notes did not exceed the outstanding principal amount, and the remaining life of the Notes was approximately 59 months.

The following table sets forth total interest expense recognized related to the Notes:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Coupon interest expense	$	551	$	—	$	551	$	—
Amortization of debt discount	$	4,097	$	—	$	4,097	$	—
Amortization of debt issuance costs	$	206	$	—	$	206	$	—
Total	$	4,854	$	—	$	4,854	$	—

Capped Call Transactions

In connection with the offering of the Notes, the Company entered into privately-negotiated capped call transactions with certain financial institution counterparties (the Capped Calls). The Capped Calls each have an initial strike price of approximately $37.43 per share of the Company's Class A common stock, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls each have an initial cap price of approximately $57.58 per share, subject to certain adjustments. The Capped Calls initially cover, subject to anti-dilution adjustments, approximately 15.4 million shares of the Company's Class A common stock. The Capped Calls are intended to generally offset potential dilution to the Company's Class A common stock upon conversion of the Notes and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion, subject to the cap price. The Capped Calls are subject to either adjustment or termination upon the occurrence of certain specified events affecting the Company, including a merger event, a tender offer, and a nationalization, insolvency, or delisting involving the Company. The Capped Calls expire in incremental components on each trading date between March 18, 2025 and May 13, 2025.

The Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The premium paid for the purchase of the Capped Calls of $67.3 million was recorded as a reduction to additional paid-in capital on the condensed consolidated balance sheets.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Bandwidth & Co-location Commitments

The Company enters into long-term non-cancelable agreements with providers in various countries to purchase capacity, such as bandwidth and co-location space, for the Company’s global cloud platform. Bandwidth and co-location costs for paying customers are recorded as cost of revenue in the condensed consolidated statements of operations and as sales and marketing expense in the condensed consolidated statements of operations for free customers. Such costs totaled $12.5 million and $8.8 million for the three months ended June 30, 2020 and 2019, respectively and $23.1 million and $17.1 million for the six months ended June 30, 2020 and 2019, respectively. Refer to the table below for long-term bandwidth and other co-location related commitments under non-cancelable contracts with various networks and Internet service providers as of June 30, 2020. For the lease components of co-location agreements, refer to Note 6 to these condensed consolidated financial statements.

Purchase Commitments

Open purchase commitments are for the purchase of services under non-cancelable contracts. They are not recorded as liabilities on the condensed consolidated balance sheet as of June 30, 2020 as the Company has not yet received the related services. Refer to the table below for purchase commitments under non-cancelable contracts with various vendors as of June 30, 2020.


	Payments Due by Period as of June 30, 2020
	Total		2020 (remaining six months)		2021		2022		2023		2024		Thereafter

	(in thousands)
Non-cancelable:
Open purchase agreements⁽¹⁾	$	16,242	$	2,695	$	3,798	$	2,689	$	1,291	$	741	$	5,028
Bandwidth and other co-location related commitments⁽²⁾	31,689		8,673		11,718		5,229		3,383		1,385		1,301
Other commitments⁽³⁾	2,188		—		2,188		—		—		—		—
Total	$	50,119	$	11,368	$	17,704	$	7,918	$	4,674	$	2,126	$	6,329

(1)Open purchase commitments are for the purchase of services under non-cancelable contracts. They were not recorded as liabilities on the condensed consolidated balance sheet as of June 30, 2020 as the Company had not yet received the related services.

(2)Long-term commitments for bandwidth usage and other co-location related commitments with various networks and Internet service providers. The costs for services not yet received were not recorded as liabilities on the condensed consolidated balance sheet as of June 30, 2020.

(3)Indemnity holdback consideration associated with the S2 acquisition. See Note 14.

Legal Matters

From time to time the Company is a party to various legal proceedings that arise in the ordinary course of business. In addition, third parties may from time to time assert claims against the Company in the form of letters and other communications. Management currently believes that there is no pending or threatened legal proceeding to which the Company is a party that is likely to have a material adverse effect on the Company’s condensed consolidated financial statements. However, the results of legal proceedings are inherently unpredictable and if an unfavorable ruling were to occur in any of the legal proceedings there exists the possibility of a material adverse effect on the Company’s financial position, results of operations, and cash flows. The Company accrues for legal proceedings that it considers probable and for which the loss can be reasonably estimated. The Company also discloses material contingencies when it believes a loss is not probable but reasonably possible. Legal costs incurred and expected to be incurred related to litigation matters are expensed as incurred.

The Company’s platform and associated products are subject to various restrictions under U.S. export control and sanctions laws and regulations, including the U.S. Department of Commerce’s Export Administration Regulations (EAR) and various economic and trade sanctions regulations administered by the U.S. Department of the Treasury’s Office of Foreign Assets Controls (OFAC). The U.S. export control laws and U.S. economic sanctions laws include restrictions or prohibitions on the sale or supply of certain products and services to U.S. embargoed or sanctioned countries, governments, persons and entities and also require authorization for the export of certain encryption items. In addition, various countries regulate the import of certain encryption technology, including through import permitting and licensing requirements and have enacted or could enact laws that could limit the Company’s ability to distribute its platform.

Although the Company takes precautions to prevent its platform and associated products from being accessed or used in violation of such laws, the Company may have inadvertently allowed its platform and associated products to be accessed or used by some customers in apparent violation of U.S. economic sanctions laws, including by users in embargoed or sanctioned countries, and the Company may have exported or allowed the download of certain software prior to making required filings with the U.S. Department of Commerce’s Bureau of Industry and Security. As a result, the Company has submitted to OFAC and to the Bureau of Industry and Security a voluntary self-disclosure concerning potential violations, and the Company has submitted a voluntary self-disclosure to the Census Bureau regarding potential violations of the Foreign Trade Regulations related to some incorrect electronic export information statements to the U.S. government for certain hardware exports, which were authorized. The voluntary self-disclosure to the Census Bureau was completed with no penalties in November 2019, and the voluntary self-disclosure to the Bureau of Industry and Security was completed with no penalties in June 2020. The voluntary self-disclosure to OFAC remains under review. If the Company is found to be in violation of U.S. economic sanctions or export control laws, it could result in substantial fines and penalties for the Company and for the individuals working for the Company. The Company may also be adversely affected through other penalties, reputational harm, loss of access to certain markets or otherwise. No loss has been recognized in the condensed

consolidated financial statements for this loss contingency as it is not probable a loss has been incurred and the range of a possible loss is not yet estimable.

Guarantees and Indemnifications

If the Company's services do not meet certain service level commitments, its contracted customers and certain of its pay-as-you-go customers are entitled to receive service credits, and in certain cases, refunds, each representing a form of variable consideration. To date, the Company has not incurred any material costs as a result of such commitments.

The Company’s arrangements generally include certain provisions for indemnifying customers against liabilities if its products or services infringe a third-party’s intellectual property rights. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. To date, the Company has not incurred any material costs as a result of such obligations and has not accrued any liabilities related to such obligations in the condensed consolidated financial statements.

The Company has also agreed to indemnify its directors, executive officers, and certain other employees for costs associated with any fees, expenses, judgments, fines, and settlement amounts incurred by them in any action or proceeding to which any of them are, or are threatened to be, made a party by reason of their service as a director or officer. The Company maintains director and officer insurance coverage that would generally enable it to recover a portion of any future amounts paid. The Company also may be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions.

Preferred Stock	6 Months Ended
Preferred Stock	Jun. 30, 2020
Temporary Equity Disclosure [Abstract]
Preferred Stock	Preferred Stock Preferred Stock In connection with the IPO, the Company's amended and restated certificate of incorporation became effective, which authorized the issuance of 225,000,000 shares of preferred stock with a par value of $0.001 per share with rights and preferences, including voting rights, designated from time to time by the Company's Board of Directors. Redeemable Convertible Preferred Stock Warrants In connection with the terms of a loan and security agreement entered into by the Company in April 2011, the Company issued a warrant to purchase 59,140 shares of Series B redeemable convertible preferred stock upon execution of the agreement, an additional warrant to purchase 94,510 shares of Series B redeemable convertible preferred stock in connection with the Company’s drawdown of $1.6 million under the facility during October 2011, and a warrant to purchase 23,760 shares of Series B redeemable convertible preferred stock in connection with the final drawdown of $0.4 million in January 2012. The warrants had an exercise price of $0.34 per share. The warrants were considered a liability and carried at fair value with any changes in fair value recognized in other income (expense), net in the condensed consolidated statements of operations. Upon completion of the IPO, the warrants to purchase Series B redeemable convertible preferred stock were automatically converted to warrants to purchase an equal number of shares of Class B common stock. As a result, the warrant liability was remeasured and reclassified to additional paid-in capital within stockholders' equity (deficit). In the year ended December 31, 2019, the warrants were exercised and such shares were settled via the net settlement method, resulting in the issuance of 174,347 shares of the Company's Class B common stock. During the three and six months ended June 30, 2019, the Company recorded a loss of $0.2 million and $0.3 million, respectively, related to the change in fair value of the redeemable convertible preferred stock warrants.

Common Stock

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Common Stock

Common StockThe Company’s amended and restated certificate of incorporation authorizes the issuance of Class A common stock and Class B common stock. The holder of each share of Class A common stock is entitled to one vote per share, while the holder of each share of Class B common stock is entitled to 10 votes per share. As of June 30, 2020 and December 31, 2019, the Company was authorized to issue 2,250,000,000 shares of Class A common stock and 315,000,000 shares of Class B common stock, each with a par value of $0.001 per share. There were 184,900,249 and 87,071,783 shares of Class A common stock issued and outstanding as of June 30, 2020 and December 31,

2019, respectively. The number of shares of Class B common stock issued and outstanding was 120,523,936 and 213,101,364, as of June 30, 2020 and December 31, 2019, respectively.

Holders of the Company’s Class A common stock and Class B common stock are entitled to dividends when, as and if, declared by the Company’s Board of Directors, subject to the rights of the holders of all classes of stock outstanding having priority rights to dividends. Any dividends paid to the holders of the Class A common stock and Class B common stock will be paid on a pro rata basis. As of June 30, 2020 and December 31, 2019, the Company had not declared any dividends. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Shares of the Company's Class B common stock are convertible into an equivalent number of shares of the Company's Class A common stock and generally convert into shares of the Company's Class A common stock upon cessation of employment or transfer, except for certain transfers described in the Company's amended and restated certificate of incorporation. Class A common stock and Class B common stock are referred to, collectively, as common stock throughout the notes to these condensed consolidated financial statements, unless otherwise indicated.

Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance, on an as-if converted basis, are as follows:


	June 30, 2020	December 31, 2019

	(in thousands)
Convertible senior notes	19,972	—
Stock options issued and outstanding	20,085	21,191
Remaining shares available for issuance under the 2019 Plan	26,289	29,048
Outstanding and unsettled restricted stock units (RSUs)	7,158	7,175
Shares available for issuance under the ESPP	5,449	5,870
Total shares of common stock reserved	78,953	63,284

Stock-based Compensation

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Stock-based Compensation

Equity Incentive Plans

In 2010, the Company's Board of Directors adopted and stockholders approved the 2010 Equity Incentive Plan (2010 Plan). The 2010 Plan is a broad-based retention program and is intended to attract and retain talented employees, directors, and non-employee consultants. The 2010 Plan provides for the granting of stock options, restricted stock, RSUs, and stock appreciation rights to employees, directors, and consultants. Incentive stock options may be granted only to employees. All other awards under the 2010 Plan, including non-qualified stock options, may be granted to employees, directors, and consultants. Except for qualifying assumptions and substitutions of options, the exercise price of an incentive stock option and non-qualified stock option shall not be less than 100% of the fair market value of such shares on the date of grant. Prior to the Company's IPO, stock-based awards forfeited, canceled, or repurchased generally were returned to the pool of shares of common stock available for issuance under the 2010 Plan. In connection with the IPO, the 2010 Plan was terminated effective immediately prior to the effectiveness of the 2019 Equity Incentive Plan (2019 Plan) and the Company ceased granting any additional awards under the 2010 Plan. All outstanding awards under the 2010 Plan at the time of the termination of the 2010 Plan remain subject to the terms of the 2010 Plan, and any shares underlying stock options that expire or terminate or are forfeited or repurchased by the Company under the 2010 Plan will be automatically transferred to the 2019 Plan.

In 2019, the Company's Board of Directors adopted and stockholders approved the 2019 Plan, which became effective one business day prior to the effective date of the Company's registration statement on Form S-1 for the IPO. The 2019 Plan provides for the granting of stock options, restricted stock, RSUs, stock appreciation rights, performance shares, performance stock units, and performance awards for the Company's Class A common stock to the Company's employees, directors, and consultants. Except as otherwise indicated below, the maximum number of shares of Class A common stock that may be issued under the 2019 Plan will not exceed 66,661,953 shares of the Company's Class A common stock, which is the sum of (1) 29,335,000 new shares, plus (2) an additional number of shares of Class A common stock not to exceed 37,326,953, consisting of the total number of

shares of Class A or Class B common stock subject to outstanding awards granted under the 2010 Plan that, on or after the 2019 Plan became effective, are canceled, expire, or otherwise terminate prior to exercise or settlement; are repurchased by the Company because of the failure to vest; or are forfeited, tendered to, or withheld by the Company (or not issued) to satisfy a tax withholding obligation or the payment of an exercise price, if any, as such shares become available from time to time. Stock-based awards under the 2019 Plan that expire or are forfeited, canceled, or repurchased generally are returned to the pool of shares of Class A common stock available for issuance under the 2019 Plan. In addition, the number of shares of the Company's Class A common stock reserved for issuance under the 2019 Plan will automatically increase on January 1 of each calendar year, starting on January 1, 2021 through January 1, 2029, in an amount equal to the least of (i) 29,335,000 shares, (ii) 5% of the total number of shares of Class A and Class B common stock outstanding on December 31 of the fiscal year before the date of each automatic increase, or (iii) a lesser number of shares determined by the compensation committee of the Company's Board of Directors prior to the applicable January 1. As of June 30, 2020, 1,700,000 stock options to purchase shares of Class A common stock and 3,099,658 shares of Class A common stock underlying RSUs have been granted under the 2019 Plan, and the number of shares of Class A common stock available for issuance under the 2019 Plan was 26,289,059.

Stock Options

Under the 2010 Plan and 2019 Plan, at exercise, stock option awards entitle the holder to receive one share of Class B or Class A common stock, in the case of the 2010 Plan, or one share of Class A common stock, in the case of the 2019 Plan. Stock options granted under the 2010 Plan and the 2019 Plan generally vest over a four-year period subject to remaining continuously employed and expire no more than 10 years from the date of grant.

The following table summarizes the stock options activity under the 2010 Plan and 2019 Plan for the six months ended June 30, 2020:


	Stock Options Outstanding
	(in thousands, except year and per share data)
	Shares Subject to Options Outstanding	Weighted- Average Exercise Price per Option		Weighted- Average Remaining Contractual Terms (in years)	Aggregate Intrinsic Value
Balances as of December 31, 2019	21,191	$	2.30	7.4	$	312,720
Options granted	1,700	$	17.93
Options exercised	(2,618)	$	1.69		$	54,791
Options canceled/forfeited/expired	(188)	$	2.56
Balances as of June 30, 2020	20,085	$	3.70	7.4	$	647,698
Vested and expected to vest as of June 30, 2020	20,085	$	3.70	7.4	$	647,698
Exercisable as of June 30, 2020	18,386	$	2.39	7.2	$	617,064

The weighted-average assumptions used to determine the fair value of stock options granted during the periods presented were as follows:


	Six months ended June 30,
	2020		2019
Expected term (in years)	6.0		6.2
Expected volatility	40.3	%	40.3	%
Risk-free interest rate	0.7	%	2.3	%
Dividend yield	—		—

The weighted-average grant date fair value of options granted during the six months ended June 30, 2020 and 2019 was $9.32 and $4.10 per share, respectively.

The aggregate intrinsic value is the difference between the exercise price of the option and the estimated fair value of the underlying common stock. Options exercisable include 13,089,561 and 15,477,903 options that were unvested as of June 30, 2020 and December 31, 2019, respectively.

The total grant date fair value for vested options in the six months ended June 30, 2020 and 2019 was $3.7 million and $2.2 million, respectively.

As of June 30, 2020 and December 31, 2019, there was $26.3 million and $15.8 million, respectively, of unrecognized stock-based compensation expense related to unvested stock options that is expected to be recognized over a weighted-average period of 3.0 years and 2.7 years, respectively.

Early Exercises of Stock Options

The 2010 Plan allows for the early exercise of stock options for certain individuals as determined by the Company’s Board of Directors. Shares of common stock issued upon early exercises of unvested options are not deemed, for accounting purposes, to be issued until those shares vest according to their respective vesting schedules and accordingly, the consideration received for early exercises is initially recorded as a liability and reclassified to common stock and additional paid-in capital as the underlying awards vest. Stock options that are early exercised are subject to a repurchase option that allows the Company to repurchase any unvested shares within six months of an individual’s termination for any reason, including death and disability (or in the case of shares issued upon exercise of an option after termination, within six months of the date of exercise). As of June 30, 2020 and December 31, 2019, the Company had $10.7 million and $13.3 million, respectively, recorded in liability for early exercise of unvested stock options, and the related number of unvested shares subject to repurchase was 4,825,368 and 5,945,083, respectively.

Restricted Stock and Restricted Stock Units

RSUs granted under the 2010 Plan generally vest upon the satisfaction of both a service-based vesting condition and a performance vesting condition, as defined below, occurring before these RSUs expire. RSUs granted under the 2019 Plan generally vest upon the satisfaction of a service-based vesting condition. The service-based vesting condition for employees under both the 2010 Plan and the 2019 Plan is typically satisfied over a four-year period. The performance vesting condition under the 2010 Plan was deemed satisfied upon the effective date of the Company's registration statement on Form S-1 filed with the SEC in connection with the IPO.

In connection with the acquisition of S2, the Company issued 948,000 shares of Class A common stock to former S2 shareholders, some of which have joined the Company as employees. Of these issued shares, 841,000 shares are restricted stock that is subject to vesting, with 77.8% of this restricted stock vesting in two years from the acquisition date and the remainder of this restricted stock vesting in three years from the acquisition date, in each case subject to remaining continuously employed. The total grant date fair value for vested shares in the six months ended June 30, 2020 and 2019, was $1.8 million and zero, respectively. The total stock-based compensation expense for shares of unvested restricted stock for the six months ended June 30, 2020 and 2019 was $2.8 million and zero, respectively. As of June 30, 2020 and 2019, the total unrecognized stock-based compensation expense related to unvested restricted stock was $11.6 million and zero, respectively. For further details on the S2 acquisition, refer to Note 14 to these condensed consolidated financial statements.

Restricted stock and RSU activity for the six months ended June 30, 2020 was as follows:


	Restricted Stock and RSUs	Weighted-Average Grant Date Fair Value

	(in thousands, except per share data)
Unvested and outstanding as of December 31, 2019	6,508	$	11.08
Granted - RSUs	1,987	$	20.61
Granted - Restricted stock	841	$	17.06
Vested - RSUs	(1,068)	$	10.17
Forfeited	(278)	$	11.35
Unvested as of June 30, 2020	7,990	$	13.04
Vested and not yet released	9	$	9.07
Outstanding as of June 30, 2020	7,999	$	13.04

The total grant date fair value for vested RSUs for the six months ended June 30, 2020 and 2019 was $10.9 million and zero, respectively. The total stock-based compensation expense for RSUs for the three months ended June 30, 2020 and 2019 was $8.7 million and zero, respectively, and for the six months ended June 30, 2020 and 2019 was $17.5 million and zero, respectively. As of June 30, 2020 and December 31, 2019, the total unrecognized stock-based compensation expense related to RSUs was $73.4 million and $53.1 million, respectively, that is expected to be recognized over a weighted-average period of 3.0 years and 2.5 years, respectively.

2019 Employee Stock Purchase Plan

In September 2019, the Company's Board of Directors adopted and stockholders approved the 2019 Employee Stock Purchase Plan (ESPP), which became effective one business day prior to the effective date of the Company's registration statement on Form S-1 filed with the SEC in connection with the IPO. A total of 5,870,000 shares of Class A common stock were initially reserved for sale under the ESPP. The number of shares of Class A common stock reserved for issuance includes an annual increase on the first day of each fiscal year, beginning on January 1, 2021, by the least of (1) 5,870,000 shares of Class A common stock, (2) 1% of the total number of shares of Class A and Class B common stock outstanding on December 31 of the fiscal year before the date of each automatic increase; or (3) such lesser amount as the compensation committee of the Company's Board of Directors may determine prior to the applicable January 1.

Generally, all regular employees, including executive officers, employed by the Company or by any of its designated subsidiaries, except for those holding 5% or more of the total combined voting power or value of all classes of common stock, may participate in the ESPP and may contribute, normally through payroll deductions, up to 10% of their eligible compensation for the purchase of Class A common stock under the ESPP. Unless otherwise determined by the compensation committee of the Board of Directors, Class A common stock will be purchased for the accounts of employees participating in the ESPP at a price per share that is the lesser of (1) 85% of the fair market value of a share of the Company's Class A common stock on the first date of an offering period, or (2) 85% of the fair market value of a share of the Company's Class A common stock on the date of purchase.

The initial offering period began on September 13, 2019 and ended on May 15, 2020, with a purchase date of May 15, 2020. In addition, a second offering period began on November 15, 2019 and also ended on May 15, 2020, with a purchase date of May 15, 2020. The subsequent offering period began on May 15, 2020 and will end on November 13, 2020. The ESPP generally provides for six-month offering periods beginning on the first day of trading on or after November 15 and May 15 of each year and terminating on the last trading day on or before May 15 and November 15, approximately six months later, with identical purchase periods. Current employees cannot sell the shares of Class A common stock purchased under the ESPP until the day after the one-year anniversary of the purchase date of such shares, except for the withholding or sale of shares by the Company to meet any applicable tax withholding obligations. No employee may purchase (i) during each purchase period more than 1,500 shares of Class A common stock and (ii) shares under the ESPP at a rate in excess of $25,000 worth of the Company's Class A common stock based on the fair market value per share of the Company's Class A common stock at the beginning of an offering for each calendar year such purchase right is outstanding.

As of June 30, 2020, 421,300 shares of Class A common stock have been purchased under the ESPP. As of June 30, 2020 and December 31, 2019, the total unrecognized stock-based compensation expense related to the ESPP was $1.7 million and $1.0 million, respectively, that is each expected to be recognized over a weighted average period of 0.4 years.

The weighted-average assumptions used to determine the fair value of the ESPP during the periods presented were as follows:


	Six months ended June 30,
	2020		2019
Expected term (in years)	0.6		N/A
Risk-free interest rate	1.2	%	N/A
Expected volatility	45.8	%	N/A
Dividend yield	—		N/A

Stock-based Compensation Expense

The following table sets forth the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Cost of revenue	$	280	$	34	$	547	$	66
Sales and marketing	3,608		275		6,771		554
Research and development	5,374		406		11,464		823
General and administrative	3,187		329		6,564		658
Total stock-based compensation expense	$	12,449	$	1,044	$	25,346	$	2,101

Net Loss per Share Attributable to Common Stockholders

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:


	Three Months Ended June 30,										Six Months Ended June 30,
	2020						2019		2020				2019
	Class A		Class B		Common		Class A		Class B		Common

	(in thousands, except per share data)
Net loss attributable to common stockholders	$	(14,773)	$	(11,362)	$	(19,706)	$	(26,404)	$	(32,477)	$	(36,820)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	169,194		130,127		85,683		133,359		164,033		85,382
Net loss per share attributable to common stockholders, basic and diluted	$	(0.09)	$	(0.09)	$	(0.23)	$	(0.20)	$	(0.20)	$	(0.43)

Since the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share as the inclusion of all potential common shares outstanding would have been antidilutive. The potential shares of common stock that were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive are as follows:


	June 30,
	2020	2019

	(in thousands)
Convertible senior notes	15,363	—
Redeemable convertible preferred stock	—	165,658
Redeemable convertible preferred stock warrants	—	177
Shares subject to repurchase	4,825	6,685
Unexercised stock options	20,085	23,558
Unvested restricted stock and RSUs	7,990	4,149
Shares issuable pursuant to the ESPP	228	—
Total	48,491	200,227

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The computation of the provision for (benefit from) income taxes for interim periods is determined by applying the estimated annual effective tax rate to year-to-date earnings from recurring operations and adjusting for discrete tax items recorded in the period. The Company's ability to estimate the geographic mix of earnings is impacted by the relatively high-growth nature of the business, fluctuations of business operations by country, and implementation of tax planning strategies. The Company recorded an income tax benefit of $1.9 million and an income tax provision of $0.4 million for the three months ended June 30, 2020 and 2019, respectively, and an income tax benefit of $2.3 million and an income tax provision of $0.7 million for the six months ended June 30, 2020 and 2019, respectively. The income tax benefit in the three and six months ended June 30, 2020 was primarily driven by the partial release of the U.S. valuation allowance in connection with the acquisition of S2 and excess tax benefits from stock-based compensation deductions in the United Kingdom, offset by withholding taxes in the U.S. and income tax expense from profitable foreign jurisdictions. In determining the need for a valuation allowance, the Company weighs both positive and negative evidence in the various jurisdictions in which it operates to determine whether it is more likely than not that its deferred tax assets are realizable. Accordingly, a full valuation allowance has been established in the U.S. and no deferred tax assets and related tax benefits have been recognized in the condensed consolidated financial statements. There is however, no valuation allowance on the foreign jurisdictions, as the foreign entities have cumulative income and expected future income. On March 27, 2020, the President of the United States signed into law the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act). The CARES Act provides for a number of tax relief provisions applicable to businesses including relaxed limitations on use of net operating losses and interest deductibility. The Company does not expect there to be a material tax impact as a result of the CARES Act, but will continue to assess the tax implications of the CARES Act and its continuing developments and interpretations.

Business Combinations

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Business Combinations

In January 2020, the Company acquired all of the outstanding shares of S2, a company based in Kirkland, Washington that has developed browser isolation technology, for a total purchase consideration of $17.7 million. The Company expects to incorporate S2's technology into the Company's Cloudflare Gateway product. The total purchase consideration included (i) acquisition-date cash payments of $13.7 million, net of $0.1 million of cash acquired, (ii) $1.8 million in shares of the Company’s Class A common stock, and (iii) a cash holdback of $2.2 million, which the Company is retaining for up to 18 months and will be payable to the previous owners of S2, subject to offset by the Company for any of the previous owners’ indemnification obligations in connection with the acquisition. Concurrent with the closing of the acquisition, the Company made a cash payment of $6.9 million to repay S2’s debt, which was part of the acquisition-date cash payments included in the purchase consideration.

In connection with the acquisition, the Company entered into compensation arrangements for stock-based and cash awards with a value totaling $20.3 million, of which $5.7 million was recognized as compensation expense on the acquisition date and $1.4 million and $2.8 million were recorded as additional compensation expense during the three and six months ended June 30, 2020, respectively. The remaining compensation amount of $11.8 million is being recognized over a future weighted-average period of 2.7 years subject to the recipients’ continued service with the Company.

The transaction-related costs for the acquisition were not material and are included in general and administrative expenses in the condensed consolidated statements of operations for the three and six months ended June 30, 2020.

The fair values of assets acquired and liabilities assumed on the acquisition date are summarized as follows (in thousands):


Prepaid expenses and other current assets	$	6
Developed technology	5,600
Goodwill	13,084
Total assets acquired	18,690
Accrued expenses and other current liabilities	(208)
Other noncurrent liabilities	(782)
Total purchase price	$	17,700

A note payable of $0.2 million, included in accrued expenses and other current liabilities in the table above, assumed on the acquisition date, was paid off during the six months ended June 30, 2020.

The acquired assets and assumed liabilities were recorded at their estimated fair values. The estimated useful life for the acquired developed technology is two years. The excess of the purchase price over the fair value of the net assets acquired was allocated to goodwill, none of which is expected to be deductible for tax purposes. Goodwill is primarily attributable to the assembled workforce as well as the anticipated synergies from the integration of S2's technology with the Company's technology. A purchase accounting adjustment of $0.8 million to revise purchase consideration and goodwill was made during the six months ended June 30, 2020.

This acquisition did not have a material impact on the Company’s condensed consolidated financial statements; therefore, historical and pro forma disclosures have not been presented.

Segment and Geographic Information

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Segment and Geographic Information

The Company’s chief operating decision maker (CODM) is its CEO, COO, and CFO. Collectively, the CODM reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company has no segment managers who are held accountable by the CODM for operations, operating results, and planning for levels or components below the consolidated unit level. Accordingly, the Company has determined it has a single operating segment.

Refer to Note 3 to these condensed consolidated financial statements for revenue by geography.

The Company’s property and equipment, net, by geographic area were as follows:


	June 30, 2020		December 31, 2019

	(in thousands)
United States	$	70,930	$	59,688
Rest of the world	43,619		41,778
Total property and equipment, net	$	114,549	$	101,466

No single country other than the United States accounted for more than 10% of total property and equipment, net as of June 30, 2020 and December 31, 2019.

Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation and Principles of Consolidation The accompanying interim condensed consolidated financial statements and accompanying notes have been prepared in conformity with generally accepted accounting principles in the United States (U.S. GAAP) and applicable regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting, and include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The Company’s fiscal year ends on December 31. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable required disclosures and regulations of the SEC. Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019.
Principles of Consolidation	All intercompany balances and transactions have been eliminated in consolidation.
Fiscal Period	The Company’s fiscal year ends on December 31.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes to the condensed consolidated financial statements. Such estimates include, but are not limited to, allowance for doubtful accounts, deferred contract acquisitions costs, the period of benefit generated from the Company’s deferred contract acquisition costs, the capitalization and estimated useful life of internal-use software, the assessment of recoverability of intangible assets and their estimated useful lives, useful lives of property and equipment, liability and equity allocation of convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation and recognition of stock-based compensation expense, uncertain tax positions, and the recognition and measurement of current and deferred income tax assets and liabilities. Management bases these estimates and assumptions on historical experience and on various other assumptions that management believes to be reasonable. Due to the COVID-19 pandemic, there is ongoing uncertainty and significant disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require an update to its estimates or assumptions or a revision of the carrying value of its assets or liabilities as of August 10, 2020, the date of issuance of this Quarterly Report on Form 10-Q. These estimates and assumptions may change in the future, however, as new events occur and additional information is obtained. Actual results could differ materially from these estimates.
Operating Leases	Operating Leases The Company enters into operating lease arrangements for real estate assets related to office space and for co-location assets related to space and equipment located in co-location facilities. The Company determines if an arrangement contains a lease at its inception by assessing whether there is an identified asset and whether the arrangement conveys the right to control the use of the identified asset in exchange for consideration. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, and operating lease liabilities, noncurrent in the Company's condensed consolidated balance sheets. Right-of-use assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the Company's obligation to make payments arising from the lease. The Company's operating lease arrangements contain both lease and non-lease components. Operating lease right-of-use assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. Lease payments consist of the fixed payments under the arrangement, less any lease incentives such as tenant improvement allowances. Variable lease costs, such as lease payments that depend on an index or a rate, are expensed as incurred and not included within the calculation of right-of-use assets and lease liabilities. At inception of an arrangement, the Company allocates the consideration to the lease and non-lease components and recognizes a right-of-use asset and corresponding lease liability for each lease component. As the implicit rate of the Company's leases is not determinable, the Company uses an incremental borrowing rate (IBR) based on the information available at the lease commencement date in determining the present value of lease payments. The lease expense is recognized on a straight-line basis over the lease term. The Company generally uses the base, non-cancelable lease term when recognizing the right-of-use assets and lease liabilities, unless it is reasonably certain that a renewal or termination option will be exercised. Leases with a term of twelve months or less are not recognized on the consolidated balance sheets. The Company recognizes lease expense for these leases on a straight-line basis over the term of the lease.
Business Combinations	Business Combinations The Company includes the results of operations of the businesses that the Company acquires from the date of acquisition. The fair value of the assets acquired and liabilities assumed is based on their estimated fair values as of the respective date of acquisition. The excess purchase price over the fair value of the net assets acquired and liabilities assumed is recorded as goodwill. Determining the fair value of assets acquired and liabilities assumed requires significant judgment and estimates including the selection of valuation methodologies, future expected cash flows, discount rates, and useful lives. The Company’s estimates of fair value are based on assumptions believed to be reasonable, but which are inherently uncertain and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill. At the conclusion of the measurement period, or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are reflected in the condensed consolidated statements of operations. When the Company issues payments or grants of equity to selling stockholders in connection with an acquisition, the Company evaluates whether the payments or awards are compensatory. This evaluation includes whether cash payments or stock award vesting is contingent on the continued employment of the selling stockholder beyond the acquisition date. If continued employment is required for the cash to be paid or stock awards to vest, the award is treated as compensation for post-acquisition services and is recognized as compensation expense. Transaction costs associated with business combinations are expensed as incurred and are included in general and administrative expense in the Company’s condensed consolidated statements of operations.
Convertible Senior Notes	Convertible Senior Notes The Company accounts for its 0.75% Convertible Senior Notes due May 2025 (the Notes) as separate liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component, representing the conversion option, is calculated by deducting the fair value of the liability component from the total principal of the convertible notes. The excess of the principal amount of the liability component over its book value (debt discount) is amortized to interest expense over the term of the Notes. In accounting for the issuance costs related to the Notes, the allocation of issuance costs incurred between the liability and equity components was based on their relative values.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842), and since that date, has issued several ASUs to further clarify certain aspects of ASU 2016-02 and provide entities with practical expedients that may be elected upon adoption. The Company adopted the new standard beginning January 1, 2020 using the modified retrospective approach, electing the optional transition approach of not adjusting the comparative period financial statements for the impact of adoption. The Company elected the package of practical expedients permitted under the transition guidance, which allows the Company to carryforward its historical lease classification, its assessment on whether a contract is or contains a lease, and its initial direct costs for any leases that existed prior to adoption of the new standard. In addition, the Company elected not to recognize lease liabilities and related right-of-use assets for leases that, at the lease commencement date, have a lease term of 12 months or less. Adoption of the new standard on January 1, 2020 resulted in the recognition of $50.0 million of operating lease right-of-use assets and $52.8 million of total operating lease liabilities on the Company's condensed consolidated balance sheets. As part of the adoption, the Company also derecognized deferred rent of $2.8 million, primarily consisting of the noncurrent portion, net build-to-suit assets of $9.9 million, the build-to-suit lease financing obligation of $10.5 million, and recorded a cumulative-effect adjustment of $0.6 million to accumulated deficit as of January 1, 2020. Refer to Note 6 to these condensed consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. This ASU changes the methodology for measuring credit losses and requires the establishment of an allowance for estimated credit losses on financial assets, including trade and other receivables, at each reporting date. The Company adopted ASU 2016-13 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (ASC 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement. This guidance provides that implementation costs be evaluated for capitalization using the same criteria as that used for internal-use software development costs, with amortization expense being recorded in the same income statement expense line as the hosted service costs and over the expected term of the hosting arrangement. For public business entities, it is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. For all other entities, it is effective for fiscal years beginning after December 15, 2020, and interim periods beginning after December 15, 2021. Early adoption of the amendments in this update is permitted, including adoption in any interim period, for all entities. The Company adopted ASU 2018-15 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In November 2019, the FASB issued ASU 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842). This ASU revises, and staggers, the effective dates for various major updates that have been issued since 2014 to alleviate the burden on both larger public companies as well as private companies, smaller public companies, not-for-profit organizations, and employee benefit plans. The Company adopted ASU 2019-10 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (ASC Topic 740). This ASU simplifies accounting for income taxes by removing certain exceptions to the general principles and amending existing guidance to improve consistent application. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company adopted ASU 2019-12 effective January 1, 2020, noting no material impact on the Company’s condensed consolidated financial statements. Recently Issued Accounting Pronouncements There have been no recent accounting pronouncements since the filing of the Company's Annual Report on Form 10-K for the year ended December 31, 2019, that may have a material impact on the Company's condensed consolidated financial statements.
Revenue	In accordance with ASC 606, revenue is recognized when a customer obtains control of promised services. The amount of revenue recognized reflects the consideration that the Company expects to be entitled to receive in exchange for these services. To achieve this standard, the Company applies the following five steps: 1. Identify the contract with a customer The Company considers the terms and conditions of the contracts and its customary business practices in identifying its contracts under ASC 606. The Company determines it has a contract with a customer when the contract is approved, the Company can identify each party’s rights regarding the services to be transferred, the Company can identify the payment terms, the Company has determined that collectibility is probable, and the contract has commercial substance. The Company applies judgment in determining that collectibility is probable, which is based on a variety of factors, including the customer’s historical payment experience or, in the case of a new customer, credit and financial information relevant to the customer. 2. Identify the performance obligations in the contract Performance obligations promised in a contract are identified based on the services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the service either on its own or together with other resources that are readily available to the Company, and are distinct in the context of the contract, whereby the transfer of the services is separately identifiable from other promises in the contract. The Company’s performance obligation primarily consists of subscription and support services, as they are provided over the same service period. 3. Determine the transaction price The transaction price is determined based on the consideration to which the Company expects to be entitled in exchange for transferring services to the customer. Usage-based variable consideration is recognized in the period it is incurred. None of the Company’s contracts contain a significant financing component. 4. Allocate the transaction price to performance obligations in the contract The subscription and support services in the Company’s contracts are considered a single performance obligation, and thus the entire transaction price is allocated to the single performance obligation. 5. Recognize revenue when or as the Company satisfies a performance obligation Revenue is recognized at the time the related performance obligation is satisfied by transferring the service to a customer. Revenue is recognized when control of the services is transferred to the Company’s customers, in an amount that reflects the consideration that the Company expects to be entitled to receive in exchange for those services. The Company generates sales directly through its sales team and through its channel partners. Revenue from sales to channel partners are recorded once all revenue recognition criteria above are met. Channel partners generally receive an order from an end-customer prior to placing an order with the Company. Payment from channel partners is not contingent on the partner’s collection from end-customers. The Company has determined that it is acting as an agent in these arrangements and records this revenue on a net basis. Subscription and Support Revenue The Company generates revenue primarily from sales to its customers of subscriptions to access its platform, together with related support services. Arrangements with customers generally do not provide the customer with the right to take possession of the Company’s software operating its global cloud platform at any time. Instead, customers are granted continuous access to the Company’s global cloud platform over the contractual period. Access to the Company’s platform and products is considered a monthly series comprising one performance obligation. A time-elapsed output method is used to measure progress because the Company transfers control evenly over the contractual period. Accordingly, the fixed consideration related to subscription and support revenue is generally recognized on a straight-line basis over the contract term beginning on the date that the Company’s service is made available to the customer. Usage-based consideration is primarily related to fees charged for the Company’s customer’s use of excess bandwidth when accessing the Company’s platform in a given period and is recognized as revenue in the period in which the usage occurs. The typical subscription and support term for the Company’s contracted customers, which consist of customers that enter into contracts for the Company's Enterprise subscription plan (and which the Company previously referred to as enterprise customers), is one year and subscription and support term lengths range from one to three years. Most of the Company’s contracts with contracted customers are non-cancelable over the contractual term. Customers typically have the right to terminate their contracts for cause if the Company fails to perform in accordance with the contractual terms. For the Company’s pay-as-you-go customers, which consist of customers that sign up for the Company's Pro or Business subscription plans through the Company's website (and which the Company previously referred to as self-serve customers), subscription and support terms are typically monthly. Variable Consideration If the Company’s services do not meet certain service level commitments, its customers are entitled to receive service credits, and in certain cases, refunds, each representing a form of variable consideration. Revenue from sales is recorded at the net sales price, which is the transaction price, and includes estimates of these forms of variable consideration to the extent that a significant reversal of cumulative revenue will not occur in a future period. The Company has historically not experienced any incidents that had a material impact on its consolidated financial statements. Accordingly, any estimated refunds related to these agreements in the condensed consolidated financial statements are not material during the periods presented. Usage-based consideration is primarily related to fees charged for the Company’s customer’s use of excess bandwidth when accessing the Company’s platform in a given period and is recognized as revenue in the period in which the usage occurs.

Revenue (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table summarizes the revenue by region based on the billing address of customers who have contracted to use the Company’s global cloud platform:


	Three Months Ended June 30,														Six Months Ended June 30,
	2020						2019						2020				2019

	(in thousands)
	Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue
United States	$	48,478	49	%	$	33,227	49	%	$	92,693	49	%	$	63,966	50	%
Europe, Middle East, and Africa	25,912		26	%	15,997		24	%	49,018		26	%	30,623		24	%
Asia Pacific	18,589		19	%	13,610		20	%	36,193		19	%	25,789		20	%
Other	6,742		6	%	4,590		7	%	13,067		6	%	8,773		6	%
Total	$	99,721	100	%	$	67,424	100	%	$	190,971	100	%	$	129,151	100	%

The following table summarizes the revenue from contracts by type of customer:


	Three Months Ended June 30,														Six Months Ended June 30,
	2020						2019						2020				2019

	(in thousands)
	Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue		Amount		Percentage of Revenue
Channel partners	$	10,153	10	%	$	5,663	8	%	$	19,312	10	%	$	11,859	9	%
Direct customers	89,568		90	%	61,761		92	%	171,659		90	%	117,292		91	%
Total	$	99,721	100	%	$	67,424	100	%	$	190,971	100	%	$	129,151	100	%

Summary of Deferred Contract Acquisition Costs

The following table summarizes the activity of the deferred contract acquisition costs:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Beginning balance	$	28,171	$	17,846	$	25,184	$	15,940
Capitalization of contract acquisition costs	9,672		4,221		16,158		8,446
Amortization of deferred contract acquisition costs	(3,963)		(2,585)		(7,462)		(4,904)
Ending balance	$	33,880	$	19,482	$	33,880	$	19,482

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value by Significant Investment Category

The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash, or available-for-sale securities as of June 30, 2020 and December 31, 2019.


(in thousands)									Reported as:
June 30, 2020	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Long- term Restricted Cash
Cash	$	17,036	$	—	$	—	$	17,036	$	14,849	$	—	$	2,187
Level I:
Money market funds	251,805		—		—		251,805		245,145		—		6,660
Level II:
Corporate bonds	137,047		404		(13)		137,438		—		137,438		—
U.S. treasury securities	495,473		905		(16)		496,362		—		496,362		—
U.S. government agency securities	50,866		26		(6)		50,886		—		50,886		—
Commercial paper	124,410		1		—		124,411		53,989		70,422		—
Subtotal	807,796		1,336		(35)		809,097		53,989		755,108		—
Total assets measured at fair value on a recurring basis	$	1,076,637	$	1,336	$	(35)	$	1,077,938	$	313,983	$	755,108	$	8,847


(in thousands)									Reported as:
December 31, 2019	Amortized Cost		Unrealized Gain		Unrealized (Loss)		Fair Value		Cash & Cash Equivalents		Available-for-sale securities		Long-term Restricted Cash
Cash	$	24,631	$	—	$	—	$	24,631	$	24,631	$	—	$	—
Level I:
Money market funds	32,856		—		—		32,856		26,196		—		6,660
Level II:
Corporate bonds	84,054		22		(30)		84,046		—		84,046		—
U.S. treasury securities	311,083		151		(23)		311,211		—		311,211		—
U.S. government agency securities	95,380		17		—		95,397		22,549		72,848		—
Commercial paper	95,467		—		—		95,467		65,600		29,867		—
Subtotal	585,984		190		(53)		586,121		88,149		497,972		—
Total assets measured at fair value on a recurring basis	$	643,471	$	190	$	(53)	$	643,608	$	138,976	$	497,972	$	6,660

Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Prepaid expenses	$	10,163	$	10,913
Deposits	3,342		2,773
Other	3,658		3,308
Total prepaid expenses and other current assets	$	17,163	$	16,994

Schedule of Property and Equipment, Net

Property and equipment, net consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Property and equipment:
Servers—network infrastructure	$	102,183	$	84,979
Buildings	—		13,035
Construction in progress	15,706		8,692
Capitalized internal-use software	42,666		31,171
Office and computer equipment	17,886		13,528
Office furniture	6,478		6,124
Software	1,331		1,025
Leasehold improvements	11,628		9,870
Asset retirement obligation	429		231
Gross property and equipment	198,307		168,655
Less accumulated depreciation and amortization	(83,758)		(67,189)
Total property and equipment, net	$	114,549	$	101,466

Schedule of Acquired Intangible Assets, Net

Acquired intangible assets, net consisted of the following:


	June 30, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	5,600	$	1,400	$	4,200
Total acquired intangible assets, net	$	5,600	$	1,400	$	4,200


	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Book Value

	(in thousands)
Developed technology	$	250	$	219	$	31
Total acquired intangible assets, net	$	250	$	219	$	31

Schedule of Estimated Future Amortization Expense of Acquired Intangible Assets

As of June 30, 2020, the estimated future amortization expense of acquired intangible assets was as follows:


	Estimated Amortization
	(in thousands)
Year ending December 31,
2020 (remaining six months)	$	1,400
2021	2,800
Total	$	4,200

Schedule of Accrued Expenses

Accrued expenses and other current liabilities consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Accrued compensation and benefits	$	20,242	$	14,970
Accrued expenses	3,904		5,331
Customer refunds and credits	1,670		3,328
Accrued co-location and bandwidth	2,831		2,696
Other	3,429		1,989
Total accrued expenses and other current liabilities	$	32,076	$	28,314

Schedule of Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Accrued compensation and benefits	$	20,242	$	14,970
Accrued expenses	3,904		5,331
Customer refunds and credits	1,670		3,328
Accrued co-location and bandwidth	2,831		2,696
Other	3,429		1,989
Total accrued expenses and other current liabilities	$	32,076	$	28,314

Schedule of Other Noncurrent Liabilities

Other noncurrent liabilities consisted of the following:


	June 30, 2020		December 31, 2019

	(in thousands)
Accrued taxes	$	5,325	$	4,862
Deferred rent	—		2,342
Other	3,948		2,599
Total other noncurrent liabilities	$	9,273	$	9,803

Leases (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Components of Lease Costs

The components of lease cost related to the Company's operating leases included in the condensed consolidated statements of operations were as follows:


	Three Months Ended June 30,		Six Months Ended June 30,

	2020
	(in thousands)
Operating lease cost	$	4,789	$	9,332
Sublease income	(710)		(1,417)
Total lease cost	$	4,079	$	7,915

Schedule of Lease Liability Maturities

Maturities of the operating lease liabilities as of June 30, 2020 are as follows:


	June 30, 2020
	(in thousands)
2020 (remaining six months)	$	8,985
2021	17,742
2022	13,131
2023	6,944
2024	3,662
Thereafter	2
Total lease payments	$	50,466
Less: Imputed interest	$	(2,358)
Total operating lease liabilities	$	48,108

Schedule of Future Minimum Lease Payments under Prior Guidance

Prior to the Company's adoption of ASC 842, future minimum operating lease payments as of December 31, 2019 were as follows:


	December 31, 2019
	(in thousands)
2020	$	18,618
2021	16,942
2022	12,423
2023	6,410
2024	4,474
Thereafter	10,304
Total lease payments	$	69,171

Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Convertible Debt

The net carrying amount of the liability component of the Notes was as follows:


	June 30, 2020
	(in thousands)
Principal	$	575,000
Unamortized debt discount	(201,193)
Unamortized debt issuance costs	(7,858)
Carrying amount of the liability component, net	$	365,949

The net carrying amount of the equity component of the Notes was as follows:


	June 30, 2020
	(in thousands)
Proceeds allocated to the conversion option (debt discount)	$	205,290
Less: allocated issuance costs	(4,478)
Carrying amount of the equity component, net	$	200,812

Schedule of Interest Expense

The following table sets forth total interest expense recognized related to the Notes:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Coupon interest expense	$	551	$	—	$	551	$	—
Amortization of debt discount	$	4,097	$	—	$	4,097	$	—
Amortization of debt issuance costs	$	206	$	—	$	206	$	—
Total	$	4,854	$	—	$	4,854	$	—

Commitment and Contingencies (Tables)

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Purchase Commitments

Refer to the table below for purchase commitments under non-cancelable contracts with various vendors as of June 30, 2020.


	Payments Due by Period as of June 30, 2020
	Total		2020 (remaining six months)		2021		2022		2023		2024		Thereafter

	(in thousands)
Non-cancelable:
Open purchase agreements⁽¹⁾	$	16,242	$	2,695	$	3,798	$	2,689	$	1,291	$	741	$	5,028
Bandwidth and other co-location related commitments⁽²⁾	31,689		8,673		11,718		5,229		3,383		1,385		1,301
Other commitments⁽³⁾	2,188		—		2,188		—		—		—		—
Total	$	50,119	$	11,368	$	17,704	$	7,918	$	4,674	$	2,126	$	6,329

(1)Open purchase commitments are for the purchase of services under non-cancelable contracts. They were not recorded as liabilities on the condensed consolidated balance sheet as of June 30, 2020 as the Company had not yet received the related services.

(2)Long-term commitments for bandwidth usage and other co-location related commitments with various networks and Internet service providers. The costs for services not yet received were not recorded as liabilities on the condensed consolidated balance sheet as of June 30, 2020.

(3)Indemnity holdback consideration associated with the S2 acquisition. See Note 14.

Common Stock (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Schedule of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance, on an as-if converted basis, are as follows:


	June 30, 2020	December 31, 2019

	(in thousands)
Convertible senior notes	19,972	—
Stock options issued and outstanding	20,085	21,191
Remaining shares available for issuance under the 2019 Plan	26,289	29,048
Outstanding and unsettled restricted stock units (RSUs)	7,158	7,175
Shares available for issuance under the ESPP	5,449	5,870
Total shares of common stock reserved	78,953	63,284

Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Awards

The following table summarizes the stock options activity under the 2010 Plan and 2019 Plan for the six months ended June 30, 2020:


	Stock Options Outstanding
	(in thousands, except year and per share data)
	Shares Subject to Options Outstanding	Weighted- Average Exercise Price per Option		Weighted- Average Remaining Contractual Terms (in years)	Aggregate Intrinsic Value
Balances as of December 31, 2019	21,191	$	2.30	7.4	$	312,720
Options granted	1,700	$	17.93
Options exercised	(2,618)	$	1.69		$	54,791
Options canceled/forfeited/expired	(188)	$	2.56
Balances as of June 30, 2020	20,085	$	3.70	7.4	$	647,698
Vested and expected to vest as of June 30, 2020	20,085	$	3.70	7.4	$	647,698
Exercisable as of June 30, 2020	18,386	$	2.39	7.2	$	617,064

Schedule of Assumptions Used to Determine the Fair Value of Stock Options Granted

The weighted-average assumptions used to determine the fair value of stock options granted during the periods presented were as follows:


	Six months ended June 30,
	2020		2019
Expected term (in years)	6.0		6.2
Expected volatility	40.3	%	40.3	%
Risk-free interest rate	0.7	%	2.3	%
Dividend yield	—		—

Schedule of Restricted Stock Units Activity

Restricted stock and RSU activity for the six months ended June 30, 2020 was as follows:


	Restricted Stock and RSUs	Weighted-Average Grant Date Fair Value

	(in thousands, except per share data)
Unvested and outstanding as of December 31, 2019	6,508	$	11.08
Granted - RSUs	1,987	$	20.61
Granted - Restricted stock	841	$	17.06
Vested - RSUs	(1,068)	$	10.17
Forfeited	(278)	$	11.35
Unvested as of June 30, 2020	7,990	$	13.04
Vested and not yet released	9	$	9.07
Outstanding as of June 30, 2020	7,999	$	13.04

Schedule of Fair Value Assumptions for Employee Stock Purchase Plan

The weighted-average assumptions used to determine the fair value of the ESPP during the periods presented were as follows:


	Six months ended June 30,
	2020		2019
Expected term (in years)	0.6		N/A
Risk-free interest rate	1.2	%	N/A
Expected volatility	45.8	%	N/A
Dividend yield	—		N/A

Schedule of Stock-based Compensation Expense

The following table sets forth the total stock-based compensation expense included in the Company’s condensed consolidated statements of operations:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019

	(in thousands)
Cost of revenue	$	280	$	34	$	547	$	66
Sales and marketing	3,608		275		6,771		554
Research and development	5,374		406		11,464		823
General and administrative	3,187		329		6,564		658
Total stock-based compensation expense	$	12,449	$	1,044	$	25,346	$	2,101

Net Loss per Share Attributable to Common Stockholders (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders:


	Three Months Ended June 30,										Six Months Ended June 30,
	2020						2019		2020				2019
	Class A		Class B		Common		Class A		Class B		Common

	(in thousands, except per share data)
Net loss attributable to common stockholders	$	(14,773)	$	(11,362)	$	(19,706)	$	(26,404)	$	(32,477)	$	(36,820)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	169,194		130,127		85,683		133,359		164,033		85,382
Net loss per share attributable to common stockholders, basic and diluted	$	(0.09)	$	(0.09)	$	(0.23)	$	(0.20)	$	(0.20)	$	(0.43)

Schedule of Potential Shares of Common Stock Excluded from Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

The potential shares of common stock that were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive are as follows:


	June 30,
	2020	2019

	(in thousands)
Convertible senior notes	15,363	—
Redeemable convertible preferred stock	—	165,658
Redeemable convertible preferred stock warrants	—	177
Shares subject to repurchase	4,825	6,685
Unexercised stock options	20,085	23,558
Unvested restricted stock and RSUs	7,990	4,149
Shares issuable pursuant to the ESPP	228	—
Total	48,491	200,227

Business Combinations (Tables)

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Schedule of Assets Acquired and Liabilities Assumed

The fair values of assets acquired and liabilities assumed on the acquisition date are summarized as follows (in thousands):


Prepaid expenses and other current assets	$	6
Developed technology	5,600
Goodwill	13,084
Total assets acquired	18,690
Accrued expenses and other current liabilities	(208)
Other noncurrent liabilities	(782)
Total purchase price	$	17,700

Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Schedule of Property and Equipment, Net by Geographic Area

The Company’s property and equipment, net, by geographic area were as follows:


	June 30, 2020		December 31, 2019

	(in thousands)
United States	$	70,930	$	59,688
Rest of the world	43,619		41,778
Total property and equipment, net	$	114,549	$	101,466

Organization and Basis of Presentation (Details) $ / shares in Units, $ in Millions	1 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Class A common stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	31,381,152
Series D, Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	(31,381,152)
Series A, Series B, And Series C, Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	(134,276,690)
Class B common stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	134,276,690
Initial Public Offering \| Class A common stock
Class of Stock [Line Items]
Shares issued in initial public offering (in shares)	40,250,000
Aggregate proceeds received from initial public offering, net of underwriters' discounts and commissions \| $	$ 565.0
Underwriters' Option \| Class A common stock
Class of Stock [Line Items]
Shares issued in initial public offering (in shares)	5,250,000
Price per share in initial public offering (in dollars per share) \| $ / shares	$ 15.00
Former Employees \| Class A common stock \| Conversion of Class B Common Stock To Class A Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	15,198,587
Former Employees \| Class B common stock \| Conversion of Class B Common Stock To Class A Common Stock
Class of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	15,198,587

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	May 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 50,000	$ 46,150			$ 0
Operating lease liability	52,800	48,108
Derecognition of deferred rent	2,800
Derecognition of build-to-suit lease	9,900	$ 9,886	$ 0
Derecognition of lease financing obligation	10,500
Cumulative effect adjustment from adoption of ASC 842	556
Convertible Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate		0.75%		0.75%
Accumulated deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from adoption of ASC 842	$ 556

Revenue - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Subscription and support term length	1 year
Revenue recognized	$ 26.8	$ 13.1
Amortization period	3 years
Minimum
Disaggregation of Revenue [Line Items]
Subscription and support term length	1 year
Maximum
Disaggregation of Revenue [Line Items]
Subscription and support term length	3 years

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 99,721	$ 67,424	$ 190,971	$ 129,151
Geographic Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
Sales Channel Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
Channel partners
Disaggregation of Revenue [Line Items]
Revenue	$ 10,153	$ 5,663	$ 19,312	$ 11,859
Channel partners \| Sales Channel Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	10.00%	8.00%	10.00%	9.00%
Direct customers
Disaggregation of Revenue [Line Items]
Revenue	$ 89,568	$ 61,761	$ 171,659	$ 117,292
Direct customers \| Sales Channel Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	90.00%	92.00%	90.00%	91.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 48,478	$ 33,227	$ 92,693	$ 63,966
United States \| Geographic Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	49.00%	49.00%	49.00%	50.00%
Europe, Middle East, and Africa
Disaggregation of Revenue [Line Items]
Revenue	$ 25,912	$ 15,997	$ 49,018	$ 30,623
Europe, Middle East, and Africa \| Geographic Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	26.00%	24.00%	26.00%	24.00%
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 18,589	$ 13,610	$ 36,193	$ 25,789
Asia Pacific \| Geographic Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	19.00%	20.00%	19.00%	20.00%
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 6,742	$ 4,590	$ 13,067	$ 8,773
Other \| Geographic Concentration Risk \| Revenue
Disaggregation of Revenue [Line Items]
Percentage of Revenue	6.00%	7.00%	6.00%	6.00%

Revenue - Deferred Contract Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 28,171	$ 17,846	$ 25,184	$ 15,940
Capitalization of contract acquisition costs	9,672	4,221	16,158	8,446
Amortization of deferred contract acquisition costs	(3,963)	(2,585)	(7,462)	(4,904)
Ending balance	$ 33,880	$ 19,482	$ 33,880	$ 19,482

Revenue - Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation, amount	$ 274.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percent	82.00%
Remaining performance obligation, expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percent	18.00%
Remaining performance obligation, expected timing of satisfaction	3 years

Fair Value Measurements - Schedule of Cash and Available-for-sale Debt Securities' Amortized Cost, Unrealized Gains (Losses) and Fair Value by Significant Investment Category (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 313,983,000	$ 138,976,000
Amortized Cost	1,076,637,000	643,471,000
Unrealized Gain	1,336,000	190,000
Unrealized (Loss)	(35,000)	(53,000)
Fair Value	1,077,938,000	643,608,000
Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	17,036,000	24,631,000
Unrealized Gain	0	0
Unrealized (Loss)	0	0
Fair Value	17,036,000	24,631,000
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized Gain	0	0
Unrealized (Loss)	0	0
Level I \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	251,805,000	32,856,000
Unrealized Gain	0	0
Unrealized (Loss)	0	0
Fair Value	251,805,000	32,856,000
Level II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	807,796,000	585,984,000
Unrealized Gain	1,336,000	190,000
Unrealized (Loss)	(35,000)	(53,000)
Fair Value	809,097,000	586,121,000
Level II \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	137,047,000	84,054,000
Unrealized Gain	404,000	22,000
Unrealized (Loss)	(13,000)	(30,000)
Fair Value	137,438,000	84,046,000
Level II \| U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	495,473,000	311,083,000
Unrealized Gain	905,000	151,000
Unrealized (Loss)	(16,000)	(23,000)
Fair Value	496,362,000	311,211,000
Level II \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	50,866,000	95,380,000
Unrealized Gain	26,000	17,000
Unrealized (Loss)	(6,000)	0
Fair Value	50,886,000	95,397,000
Level II \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	124,410,000	95,467,000
Unrealized Gain	1,000	0
Unrealized (Loss)	0	0
Fair Value	124,411,000	95,467,000
Cash & Cash Equivalents \| Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	313,983,000	138,976,000
Cash & Cash Equivalents \| Fair Value, Recurring \| Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	14,849,000	24,631,000
Cash & Cash Equivalents \| Fair Value, Recurring \| Level I \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	245,145,000	26,196,000
Cash & Cash Equivalents \| Fair Value, Recurring \| Level II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	53,989,000	88,149,000
Cash & Cash Equivalents \| Fair Value, Recurring \| Level II \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Cash & Cash Equivalents \| Fair Value, Recurring \| Level II \| U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Cash & Cash Equivalents \| Fair Value, Recurring \| Level II \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	22,549,000
Cash & Cash Equivalents \| Fair Value, Recurring \| Level II \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	53,989,000	65,600,000
Available-for-sale securities \| Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	755,108,000	497,972,000
Available-for-sale securities \| Fair Value, Recurring \| Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Available-for-sale securities \| Fair Value, Recurring \| Level I \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Available-for-sale securities \| Fair Value, Recurring \| Level II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	755,108,000	497,972,000
Available-for-sale securities \| Fair Value, Recurring \| Level II \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	137,438,000	84,046,000
Available-for-sale securities \| Fair Value, Recurring \| Level II \| U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	496,362,000	311,211,000
Available-for-sale securities \| Fair Value, Recurring \| Level II \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	50,886,000	72,848,000
Available-for-sale securities \| Fair Value, Recurring \| Level II \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	70,422,000	29,867,000
Long-term Restricted Cash \| Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	8,847,000	6,660,000
Long-term Restricted Cash \| Fair Value, Recurring \| Cash
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,187,000	0
Long-term Restricted Cash \| Fair Value, Recurring \| Level I \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	6,660,000	6,660,000
Long-term Restricted Cash \| Fair Value, Recurring \| Level II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Long-term Restricted Cash \| Fair Value, Recurring \| Level II \| Corporate bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Long-term Restricted Cash \| Fair Value, Recurring \| Level II \| U.S. treasury securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Long-term Restricted Cash \| Fair Value, Recurring \| Level II \| U.S. government agency securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	0	0
Long-term Restricted Cash \| Fair Value, Recurring \| Level II \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 0	$ 0

Fair Value Measurements - Narrative (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized cost of available-for-sale investments with maturities less than one year	$ 677,200,000	$ 450,200,000
Amortized cost of available-for-sale investments with maturities greater than one year	76,600,000	47,700,000
Net unrealized gains on investments, net of tax	1,200,000	100,000
Convertible Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	677,300,000
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized gain	0	0
Unrealized loss	$ 0	$ 0

Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts	$ 1,600		$ 1,600		$ 500
Bad debt expense	300	$ 200	2,493	$ 451
Write-off of uncollectible accounts receivable	$ (900)	$ (100)	$ (1,400)	$ (100)

Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 10,163	$ 10,913
Deposits	3,342	2,773
Other	3,658	3,308
Total prepaid expenses and other current assets	$ 17,163	$ 16,994

Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 198,307		$ 198,307		$ 168,655
Less accumulated depreciation and amortization		(83,758)		(83,758)		(67,189)
Total property and equipment, net		114,549		114,549		101,466
Depreciation and amortization expense		10,800	$ 7,000	20,700	$ 13,100
Servers—network infrastructure
Property, Plant and Equipment [Line Items]
Gross property and equipment		102,183		102,183		84,979
Buildings
Property, Plant and Equipment [Line Items]
Gross property and equipment		0		0		13,035
Buildings \| ASC 842
Property, Plant and Equipment [Line Items]
Change in property and equipment for adoption of new ASU	$ (13,000)
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property and equipment		15,706		15,706		8,692
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Gross property and equipment		42,666		42,666		31,171
Depreciation and amortization expense				5,300	$ 2,800
Office and computer equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment		17,886		17,886		13,528
Office furniture
Property, Plant and Equipment [Line Items]
Gross property and equipment		6,478		6,478		6,124
Software
Property, Plant and Equipment [Line Items]
Gross property and equipment		1,331		1,331		1,025
Depreciation and amortization expense		2,800	$ 1,500
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment		11,628		11,628		9,870
Leasehold improvements \| ASC 842
Property, Plant and Equipment [Line Items]
Change in property and equipment for adoption of new ASU	$ 1,600
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 429		$ 429		$ 231

Balance Sheet Components - Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jan. 31, 2020	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 17,167		$ 4,083
S2 Systems Corporation
Indefinite-lived Intangible Assets [Line Items]
Goodwill		$ 13,084
Goodwill acquired during period	$ 13,100

Balance Sheet Components - Acquired Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,600		$ 5,600		$ 250
Accumulated Amortization	1,400		1,400		219
Net Book Value	4,200		4,200		31
Acquired in-process research and development in process			5,600
Amortization of acquired intangible assets	700	$ 0	1,400	$ 100
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,600		5,600		250
Accumulated Amortization	1,400		1,400		219
Net Book Value	$ 4,200		$ 4,200		$ 31

Balance Sheet Components - Estimated Future Amortization Expense of Acquired Intangible Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2020 (remaining six months)	$ 1,400
2021	2,800
Net Book Value	$ 4,200	$ 31

Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and benefits	$ 20,242	$ 14,970
Accrued expenses	3,904	5,331
Customer refunds and credits	1,670	3,328
Accrued co-location and bandwidth	2,831	2,696
Other	3,429	1,989
Total accrued expenses and other current liabilities	$ 32,076	$ 28,314

Balance Sheet Components - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued taxes	$ 5,325	$ 4,862
Deferred rent	0	2,342
Other	3,948	2,599
Total other noncurrent liabilities	$ 9,273	$ 9,803

Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Sublease, remaining lease term			10 months 24 days
Sublease income	$ 710	$ 300	$ 1,417	$ 300
Lease not yet commenced, undiscounted amount	$ 20,200		$ 20,200
Weighted average remaining lease term	3 years 1 month 6 days		3 years 1 month 6 days
Operating lease, weighted average discount rate, percent	3.30%		3.30%
Rent expense		$ 2,700		$ 5,300
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term			4 years 6 months
Lease not yet commenced, term of contract	3 years 3 months 18 days		3 years 3 months 18 days
Co-location Asset Lease \| Maximum
Lessee, Lease, Description [Line Items]
Operating lease, remaining lease term			4 years 7 months 6 days

Leases - Schedule of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 4,789		$ 9,332	$ 0
Sublease income	(710)	$ (300)	(1,417)	$ (300)
Total lease cost	$ 4,079		$ 7,915

Leases - Lease Liability Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020
Leases [Abstract]
2020 (remaining six months)	$ 8,985
2021	17,742
2022	13,131
2023	6,944
2024	3,662
Thereafter	2
Total lease payments	50,466
Less: Imputed interest	(2,358)
Total operating lease liabilities	$ 48,108	$ 52,800

Leases - Future Minimum Payments Due Under Prior Guidance (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
2020	$ 18,618
2021	16,942
2022	12,423
2023	6,410
2024	4,474
Thereafter	10,304
Total lease payments	$ 69,171

Debt - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) day $ / shares shares	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Gross proceeds from issuance of convertible senior notes	$ 562,500,000		$ 575,000,000	$ 0
Convertible debt, conversion ratio			0.0267187
Conversion price (in dollars per share) \| $ / shares		$ 37.43	$ 37.43
Convertible debt, equity component	$ 205,300,000	$ 200,812,000	$ 200,812,000
Issuance cost, equity component		$ 4,478,000	4,478,000
Issuance cost, equity component			$ 0	$ 969,000
Remaining life			59 months
Shares covered by capped calls (in shares) \| shares		15.4	15.4
Purchases of capped calls related to convertible senior notes		$ 67,333,000	$ 67,333,000
Class A common stock
Debt Instrument [Line Items]
Capped call, initial strike price (in dollars per share) \| $ / shares	$ 37.43
Capped call, initial cap price (in dollars per share) \| $ / shares	$ 57.58
Convertible Senior Notes
Debt Instrument [Line Items]
Debt principal amount	$ 575,000,000.0
Face amount, additional principal issuable	$ 75,000,000.0
Interest rate	0.75%	0.75%	0.75%
Issuance cost, liability component	$ 8,000,000.0
Issuance cost, equity component	$ 4,500,000
Measurement Input, Effective Interest Rate \| Convertible Senior Notes
Debt Instrument [Line Items]
Measurement input		0.100	0.100
Scenario One, Prior to February 14, 2025
Debt Instrument [Line Items]
Conversion requirement, threshold trading days \| day			20
Conversion requirement, threshold consecutive trading days \| day			30
Conversion requirement, threshold percentage of stock price trigger			130.00%
Scenario Two, Prior to February 14, 2025
Debt Instrument [Line Items]
Conversion requirement, threshold consecutive trading days \| day			5
Conversion requirement, threshold percentage of stock price trigger			98.00%
Conversion requirement, threshold business days following consecutive trading days \| day			5
Scenario Three, Subsequent to May 20, 2023
Debt Instrument [Line Items]
Conversion requirement, threshold trading days \| day			20
Conversion requirement, threshold consecutive trading days \| day			30
Scenario Three, Subsequent to May 20, 2023 \| Convertible Senior Notes
Debt Instrument [Line Items]
Conversion requirement, threshold percentage of stock price trigger			130.00%
Redemption price, percentage			100.00%
Scenario Four, Fundamental Change \| Convertible Senior Notes
Debt Instrument [Line Items]
Redemption price, percentage			100.00%

Debt - Liability Component (Details) - Convertible Senior Notes $ in Thousands	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Principal	$ 575,000
Unamortized debt discount	(201,193)
Unamortized debt issuance costs	(7,858)
Carrying amount of the liability component, net	$ 365,949

Debt - Equity Component (Details) - USD ($) $ in Thousands	Jun. 30, 2020	May 31, 2020
Debt Disclosure [Abstract]
Proceeds allocated to the conversion option (debt discount)	$ 205,290
Less: allocated issuance costs	(4,478)
Carrying amount of the equity component, net	$ 200,812	$ 205,300

Debt - Schedule of Interest Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Coupon interest expense	$ 551	$ 0	$ 551	$ 0
Amortization of debt discount	4,097	0	4,097	0
Amortization of debt issuance costs	206	0	206	0
Total	$ 4,854	$ 0	$ 4,854	$ 0

Commitment and Contingencies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Cost and expenses related to bandwidth and other co-location commitments	$ 12.5	$ 8.8	$ 23.1	$ 17.1

Commitment and Contingencies - Schedule of Purchase Commitments (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Open Purchase Agreements
Total payments due, open purchase agreements	$ 16,242
2020 (remaining six months)	2,695
2021	3,798
2022	2,689
2023	1,291
2024	741
Thereafter	5,028
Bandwidth and Co-Location Commitments
Total payments due, bandwidth and co-location commitments	31,689
2020 (remaining six months)	8,673
2021	11,718
2022	5,229
2023	3,383
2024	1,385
Thereafter	1,301
Other Commitments
Total payments due, other commitments	2,188
2020 (remaining six months)	0
2021	2,188
2022	0
2023	0
2024	0
Thereafter	0
Total Purchase Commitments
Total payments due, purchase commitments	50,119
2020 (remaining six months)	11,368
2021	17,704
2022	7,918
2023	4,674
2024	2,126
Thereafter	$ 6,329

Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Apr. 30, 2011
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)							225,000,000
Preferred stock, par value (in dollars per share)							$ 0.001
Change in fair value of redeemable convertible preferred stock warrant liability			$ 200	$ 0	$ 327
Warrant To Purchase Series B Redeemable Preferred Stock
Class of Stock [Line Items]
Number of shares subject to purchase from warrant (in shares)	23,760	94,510						59,140
Proceeds from drawdown	$ 400	$ 1,600
Exercise price of warrants (in dollars per share)								$ 0.34
Class B common stock
Class of Stock [Line Items]
Number of shares issued from exercise of warrants (in shares)						174,347

Common Stock - Narrative (Details)	Jun. 30, 2020 vote $ / shares shares	Dec. 31, 2019 $ / shares shares
Class A common stock
Class of Stock [Line Items]
Common stock, number of votes per share \| vote	1
Common stock, shares authorized (in shares)	2,250,000,000	2,250,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	184,900,249	87,071,783
Common stock, shares outstanding (in shares)	184,900,249	87,071,783
Class B common stock
Class of Stock [Line Items]
Common stock, number of votes per share \| vote	10
Common stock, shares authorized (in shares)	315,000,000	315,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	120,523,936	213,101,364
Common stock, shares outstanding (in shares)	120,523,936	213,101,364

Common Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares shares in Thousands	Jun. 30, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	78,953	63,284
2019 Plan
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	26,289	29,048
Options
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	20,085	21,191
Outstanding and unsettled restricted stock units (RSUs)
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	7,158	7,175
Shares available for issuance under the ESPP
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	5,449	5,870
Convertible Senior Notes
Class of Stock [Line Items]
Shares of common stock reserved (in shares)	19,972	0

Stock-based Compensation - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 13, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant date fair value for vested options				$ 3,700,000	$ 2,200,000
Issuance of common stock in connection with acquisition (in shares)				948,000
Stock-based compensation expense		$ 12,449,000	$ 1,044,000	$ 25,346,000	$ 2,101,000
Shares of common stock reserved (in shares)		78,953,000		78,953,000		63,284,000
Class A common stock \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)		66,661,953		66,661,953
Number of new shares authorized for issuance (in shares)		29,335,000		29,335,000
Number of additional shares authorized for issuance (in shares)		37,326,953		37,326,953
Number of shares available for issuance (in shares)		26,289,059		26,289,059
Class A and Class B Common Stock \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential increase in number of shares authorized, as a percentage of total common stock outstanding				5.00%
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value for options granted (in dollars per share)				$ 9.32	$ 4.10
Unvested options exercisable (in shares)		13,089,561		13,089,561		15,477,903
Options unrecognized stock-based compensation expense		$ 26,300,000		$ 26,300,000		$ 15,800,000
Weighted-average remaining vesting period				3 years		2 years 8 months 12 days
Liability for early exercise of stock options		$ 10,700,000		$ 10,700,000		$ 13,300,000
Number of unvested shares expected to be repurchased (in shares)				4,825,368		5,945,083
Shares of common stock reserved (in shares)		20,085,000		20,085,000		21,191,000
Options \| 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Expiration period				10 years
Options \| Common Stock \| 2010 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of common stock, percentage of fair market value				100.00%
Options \| Class A common stock \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative shares granted (in shares)		1,700,000		1,700,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				1,987,000
Vesting period				4 years
Weighted-average remaining vesting period				3 years		2 years 6 months
Stock-based compensation expense		$ 8,700,000	0	$ 17,500,000	$ 0
Unrecognized stock-based compensation expense		$ 73,400,000		73,400,000		$ 53,100,000
Total grant date fair value for vested shares				$ 10,900,000	0
Shares of common stock reserved (in shares)		7,158,000		7,158,000		7,175,000
Restricted Stock Units (RSUs) \| Class A common stock \| 2019 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative shares granted (in shares)		3,099,658		3,099,658
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				841,000
Issuance of unvested restricted stock in connection with acquisition (in shares)				841,000
Restricted stock issued in connection with acquisition, aggregate grant date fair value				$ 1,800,000	0
Stock-based compensation expense				2,800,000	0
Unrecognized stock-based compensation expense		$ 11,600,000	$ 0	$ 11,600,000	$ 0
Restricted Stock \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				2 years
Vesting percentage				77.80%
Restricted Stock \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Shares available for issuance under the ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved (in shares)		5,449,000		5,449,000		5,870,000
Shares available for issuance under the ESPP \| 2019 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining vesting period				4 months 24 days		4 months 24 days
Unrecognized stock-based compensation expense		$ 1,700,000		$ 1,700,000		$ 1,000,000.0
Maximum ownership percentage threshold for participation	5.00%
Maximum contribution percentage per employee	10.00%
Shares available for issuance under the ESPP \| Class A common stock \| 2019 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares allowable under the plan (in shares)	5,870,000
Purchase price of common stock, percentage of fair value	85.00%
Offering period	6 months
Purchase period	6 months
Maximum number of shares available for repurchase for each employee (in shares)	1,500
Maximum value of shares available for repurchase for each employee	$ 25,000
Number of shares repurchased (in shares)				421,300
Shares available for issuance under the ESPP \| Class A and Class B Common Stock \| 2019 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential increase in number of share authorized, as a percentage of total common stock outstanding	1.00%

Stock-based Compensation - Schedule of Stock-based Awards (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Shares Subject to Options Outstanding
Stock options outstanding, beginning balance (in shares) \| shares	21,191
Stock options granted (in shares) \| shares	1,700
Stock options exercised (in shares) \| shares	(2,618)
Stock options cancelled, forfeited, expired (in shares) \| shares	(188)
Stock options outstanding, ending balance (in shares) \| shares	20,085	21,191
Stock options vested and expected to vest (in shares) \| shares	20,085
Stock options exercisable (in shares) \| shares	18,386
Weighted- Average Exercise Price per Option
Stock options outstanding, weighted-average exercise price, beginning balance (in dollars per share) \| $ / shares	$ 2.30
Stock options granted, weighted-average exercise price (in dollars per share) \| $ / shares	17.93
Stock options exercised, weighted-average exercise price (in dollars per share) \| $ / shares	1.69
Stock options cancelled, forfeited, expired, weighted-averaged exercise price (in dollars per share) \| $ / shares	2.56
Stock options outstanding, weighted-average exercise price, ending balance (in dollars per share) \| $ / shares	3.70	$ 2.30
Stock options vested and expected to vest, weighted-average exercise price (in dollars per share) \| $ / shares	3.70
Stock options exercisable, weighted-average exercise price (in dollars per share) \| $ / shares	$ 2.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options outstanding, weighted-average remaining contractual term	7 years 4 months 24 days	7 years 4 months 24 days
Stock options vested and expected to vest, weighted-average remaining contractual term	7 years 4 months 24 days
Stock options exercisable, weighted-average remaining contractual term	7 years 2 months 12 days
Share-Based Payment Award, Options, Aggregate Intrinsic Value [Abstract]
Stock options outstanding, aggregate intrinsic value \| $	$ 647,698	$ 312,720
Stock options exercised, aggregate intrinsic value \| $	54,791
Stock options vested and expected to vest, aggregate intrinsic value \| $	647,698
Stock options exercisable, aggregate intrinsic value \| $	$ 617,064

Stock-based Compensation - Schedule of Assumptions Used to Determine the Fair Value of Stock Options Granted (Details) - Options	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 years	6 years 2 months 12 days
Expected volatility	40.30%	40.30%
Risk-free interest rate	0.70%	2.30%
Dividend yield	0.00%	0.00%

Stock-based Compensation - Schedule of Restricted Stock Units Activity (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Restricted Stock and Restricted Stock Units
Restricted Stock and RSUs
Unvested and outstanding, beginning balance (in shares) \| shares	6,508
Forfeited (in shares) \| shares	(278)
Unvested, ending balance (in shares) \| shares	7,990
Vested and not yet released (in shares) \| shares	9
Outstanding at end of period (in shares) \| shares	7,999
Weighted-Average Grant Date Fair Value
Unvested, weighted average grant date fair value, beginning balance (in dollars per share) \| $ / shares	$ 11.08
Forfeited (in dollars per share) \| $ / shares	11.35
Unvested, weighted average grant date fair value, ending balance (in dollars per share) \| $ / shares	13.04
Vested and not yet released, weighted-average grant date fair value (in dollars per share) \| $ / shares	9.07
Outstanding at end of period, weighted-average grant date fair value (in dollars per share) \| $ / shares	$ 13.04
Restricted Stock Units (RSUs)
Restricted Stock and RSUs
Granted (in shares) \| shares	1,987
Vested (in shares) \| shares	(1,068)
Weighted-Average Grant Date Fair Value
Granted (in dollars per share) \| $ / shares	$ 20.61
Vested (in dollars per share) \| $ / shares	$ 10.17
Restricted Stock
Restricted Stock and RSUs
Granted (in shares) \| shares	841
Weighted-Average Grant Date Fair Value
Granted (in dollars per share) \| $ / shares	$ 17.06

Stock-based Compensation - Schedule of Fair Value Assumptions for Employee Stock Purchase Plan (Details) - Shares available for issuance under the ESPP	6 Months Ended
	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	7 months 6 days
Risk-free interest rate	1.20%
Expected volatility	45.80%
Dividend yield	0.00%

Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 12,449	$ 1,044	$ 25,346	$ 2,101
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	280	34	547	66
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	3,608	275	6,771	554
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	5,374	406	11,464	823
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 3,187	$ 329	$ 6,564	$ 658

Net Loss per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Earnings per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (26,135)	$ (19,706)	$ (58,881)	$ (36,820)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	299,321	85,683	297,392	85,382
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.09)	$ (0.23)	$ (0.20)	$ (0.43)
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders		$ (19,706)		$ (36,820)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)		85,683		85,382
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)		$ (0.23)		$ (0.43)
Class A common stock \| Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (14,773)		$ (26,404)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	169,194		133,359
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.09)		$ (0.20)
Class B common stock \| Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss attributable to common stockholders	$ (11,362)		$ (32,477)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	130,127		164,033
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.09)		$ (0.20)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss per Share Attributable to Common Stockholders - Schedule of Potential Shares of Common Stock Excluded from Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	48,491	200,227
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	15,363	0
Redeemable convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	0	165,658
Redeemable convertible preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	0	177
Shares subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	4,825	6,685
Unexercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	20,085	23,558
Unvested restricted stock and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	7,990	4,149
Shares issuable pursuant to the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential shares of common stock excluded from computation of diluted net loss per share attributable to common stockholders (in shares)	228	0

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (1,938)	$ 389	$ (2,276)	$ 703

Business Combinations - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2020	Jun. 30, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Repayments of notes payable			$ 0.2
Purchase accounting adjustment			0.8
S2 Systems Corporation
Business Acquisition [Line Items]
Consideration transferred	$ 17.7
Cash payments to acquire businesses	13.7
Cash acquired	0.1
Value of shares issued	1.8
Consideration held back	$ 2.2
Consideration holdback period	18 months
Payments to settle acquiree's outstanding debt	$ 6.9
Compensation arrangements value	20.3
Compensation arrangement with individual, compensation expense	$ 5.7	$ 1.4	2.8
Compensation arrangement with individual, recorded liability		$ 11.8	$ 11.8
Compensation arrangement, weighted-average remaining recognition period			2 years 8 months 12 days
Estimated useful life of acquired developed technology	2 years

Business Combinations - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 17,167		$ 4,083
S2 Systems Corporation
Business Acquisition [Line Items]
Prepaid expenses and other current assets		$ 6
Developed technology		5,600
Goodwill		13,084
Total assets acquired		18,690
Accrued expenses and other current liabilities		(208)
Other noncurrent liabilities		(782)
Total purchase price		$ 17,700

Segment and Geographic Information - Narrative (Details)	6 Months Ended
	Jun. 30, 2020 segment
Segment Reporting [Abstract]
Number of operating segments	1

Segment and Geographic Information - Schedule of Property and Equipment, Net by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Property and equipment, net	$ 114,549	$ 101,466
United States
Segment Reporting Information [Line Items]
Property and equipment, net	70,930	59,688
Rest of the world
Segment Reporting Information [Line Items]
Property and equipment, net	$ 43,619	$ 41,778