Document, Entity and Information - shares	6 Months Ended
Document, Entity and Information - shares	Jun. 30, 2020	Aug. 03, 2020
Class of Stock [Line Items]
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0629474
Entity Address, Address Line One	3025 Clearview Way
Entity Address, City or Town	San Mateo,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94402
Title of 12(b) Security	Class A common stock, $0.001 par value
Trading Symbol	GPRO
Entity Registrant Name	GOPRO, INC.
City Area Code	(650)
Local Phone Number	332-7600
Entity Central Index Key	0001500435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-36514
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Security Exchange Name	NASDAQ
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		128,941,269
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		28,887,185

Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 79,679,000	$ 150,301,000
Marketable securities	0	14,847,000
Accounts receivable, net	68,498,000	200,634,000
Inventory	142,151,000	144,236,000
Prepaid expenses and other current assets	23,773,000	25,958,000
Total current assets	314,101,000	535,976,000
Property and equipment, net	29,180,000	36,539,000
Operating Lease, Right-of-Use Asset	48,963,000	53,121,000
Intangible assets, net	2,901,000	5,247,000
Goodwill	146,459,000	146,459,000
Other long-term assets	13,564,000	15,461,000
Total assets	555,168,000	792,803,000
Current liabilities:
Accounts payable	48,959,000	160,695,000
Accrued expenses and other current liabilities	88,605,000	141,790,000
Short-term operating lease liabilities	8,936,000	9,099,000
Deferred revenue	13,627,000	15,467,000
Short-term Bank Loans and Notes Payable	30,000,000	0
Total current liabilities	190,127,000	327,051,000
Long-term taxes payable	15,408,000	13,726,000
Long-term debt	154,063,000	148,810,000
Long-term operating lease liabilities	57,916,000	62,961,000
Other long-term liabilities	5,576,000	6,726,000
Total liabilities	423,090,000	559,274,000
Commitments, contingencies and guarantees
Stockholders’ equity:
Preferred Stock, Value, Outstanding	0	0
Common Stocks, Including Additional Paid in Capital	943,927,000	930,875,000
Treasury Stock, Value	(113,613,000)	(113,613,000)
Accumulated deficit	(698,236,000)	(583,733,000)
Total stockholders’ equity	132,078,000	233,529,000
Total liabilities and stockholders’ equity	$ 555,168,000	$ 792,803,000
Preferred Stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)	5,000	5,000
Preferred Stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)	5,000	5,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Treasury Stock, Value	$ 113,613,000	$ 113,613,000
Common Stocks, Including Additional Paid in Capital	943,927,000	930,875,000
Preferred Stock, Value, Outstanding	$ 0	$ 0
Treasury Stock, Shares (shares)	10,710	10,710
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Treasury Stock, Shares (shares)	10,710	10,710
Common Class A [Member]
Common stock outstanding (shares)	119,751	117,922
Common Stock, Shares Authorized (shares)	500,000	500,000
Common Stock, Shares, Issued	119,751	117,922
Common Stock, Shares Authorized (shares)	500,000	500,000
Common Stock, Shares, Issued	119,751	117,922
Common Class B [Member]
Common stock outstanding (shares)	28,887	28,897
Common Stock, Shares Authorized (shares)	150,000	150,000
Common Stock, Shares, Issued	28,887	28,897
Common Stock, Shares Authorized (shares)	150,000	150,000
Common Stock, Shares, Issued	28,887	28,897

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Preferred Stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)	5,000	5,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Treasury Stock, Shares (shares)	10,710	10,710
Common Class A [Member]
Common Stock, Shares Authorized (shares)	500,000	500,000
Common Stock, Shares, Issued	119,751	117,922
Common stock outstanding (shares)	119,751	117,922
Common Class B [Member]
Common Stock, Shares Authorized (shares)	150,000	150,000
Common Stock, Shares, Issued	28,887	28,897
Common stock outstanding (shares)	28,887	28,897

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	$ 134,246	$ 292,429	$ 253,646	$ 535,137
Cost of revenue	93,554	190,244	174,527	352,605
Gross profit	40,692	102,185	79,119	182,532
Operating expenses:
Research and development	34,558	38,811	66,839	76,275
Sales and marketing	34,965	52,135	78,467	99,425
General and administrative	16,083	18,186	34,841	34,067
Total operating expenses	85,606	109,132	180,147	209,767
Operating loss	(44,914)	(6,947)	(101,028)	(27,235)
Interest expense	(4,671)	(4,882)	(9,514)	(9,409)
Other Nonoperating Expense	(321)	(63)	(493)
Other income (expense), net				765
Total other expense, net	(4,992)	(4,945)	(10,007)	(8,644)
Loss before income taxes	(49,906)	(11,892)	(111,035)	(35,879)
Income tax expense (benefit)	(1,069)	605	(3,468)	227
Net loss	$ (50,975)	$ (11,287)	$ (114,503)	$ (35,652)
Earnings Per Share, Basic and Diluted	$ (0.34)	$ (0.08)	$ (0.77)	$ (0.25)
Weighted Average Number of Shares Outstanding, Basic and Diluted	148,497	144,668	148,028	143,640

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (114,503)	$ (35,652)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	10,693	13,402
Amortization of Leased Asset	4,158	5,389
Stock-based compensation	13,513	20,391
Deferred income taxes	53	(97)
Restructuring Costs	3,299	199
Amortization of Debt Discount (Premium)	4,850	4,378
Other	1,199	229
Changes in operating assets and liabilities:
Accounts receivable, net	131,889	(15,482)
Inventory	2,085	(12,712)
Prepaid expenses and other assets	3,137	5,208
Accounts payable and other liabilities	(169,944)	(49,242)
Deferred revenue	(2,457)	(1,633)
Net Cash Provided by (Used in) Operating Activities	(112,028)	(66,020)
Investing activities:
Purchases of property and equipment, net	(2,163)	(1,999)
Purchases of marketable securities	0	(30,167)
Maturities of marketable securities	14,830	35,278
Sale of marketable securities	0	1,889
Payments for (Proceeds from) Other Investing Activities	438	0
Net cash provided by investing activities	12,229	5,001
Financing activities:
Proceeds from issuance of common stock	1,909	3,877
Payment, Tax Withholding, Share-based Payment Arrangement	(2,354)	(3,997)
Net cash provided by (used in) financing activities	29,555	(120)
Proceeds from Bank Debt	30,000	0
Effect of exchange rate changes on cash and cash equivalents	(378)	294
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(70,622)	(60,845)
Cash and cash equivalents at beginning of period	150,301	152,095
Cash and cash equivalents at end of period	$ 79,679	$ 91,250

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Including Additional Paid in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2018	$ 212,112	$ 894,755	$ (113,613)	$ (569,030)
Beginning Balance (shares) at Dec. 31, 2018		141,067
Common stock issued under employee benefit plans, net of shares withheld for tax	3,761	$ 3,761
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2,673)	$ 2,673
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		3,293
Allocated share-based compensation expense	9,782	$ 9,782
Net loss	(24,365)			(24,365)
Ending Balance at Mar. 31, 2019	198,556	$ 905,625	(113,613)	(593,456)
Ending Balance (shares) at Mar. 31, 2019		144,360
Beginning Balance at Dec. 31, 2018	212,112	$ 894,755	(113,613)	(569,030)
Beginning Balance (shares) at Dec. 31, 2018		141,067
Net loss	(35,652)
Ending Balance at Jun. 30, 2019	196,695	$ 915,051	(113,613)	(604,743)
Ending Balance (shares) at Jun. 30, 2019		144,888
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				(61)
Beginning Balance at Mar. 31, 2019	198,556	$ 905,625	(113,613)	(593,456)
Beginning Balance (shares) at Mar. 31, 2019		144,360
Common stock issued under employee benefit plans, net of shares withheld for tax	144	$ 144
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(1,324)	$ 1,324
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		528
Allocated share-based compensation expense	10,606	$ 10,606
Net loss	(11,287)			(11,287)
Ending Balance at Jun. 30, 2019	196,695	$ 915,051	(113,613)	(604,743)
Ending Balance (shares) at Jun. 30, 2019		144,888
Beginning Balance at Dec. 31, 2019	233,529	$ 930,875	(113,613)	(583,733)
Beginning Balance (shares) at Dec. 31, 2019		146,818
Common stock issued under employee benefit plans, net of shares withheld for tax	1,863	$ 1,863
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2,003)	$ 2,003
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,542
Allocated share-based compensation expense	7,637	$ 7,637
Net loss	(63,528)			(63,528)
Ending Balance at Mar. 31, 2020	177,498	$ 938,372	(113,613)	(647,261)
Ending Balance (shares) at Mar. 31, 2020		148,360
Beginning Balance at Dec. 31, 2019	233,529	$ 930,875	(113,613)	(583,733)
Beginning Balance (shares) at Dec. 31, 2019		146,818
Net loss	(114,503)
Ending Balance at Jun. 30, 2020	132,078	$ 943,927	(113,613)	(698,236)
Ending Balance (shares) at Jun. 30, 2020		148,638
Beginning Balance at Mar. 31, 2020	177,498	$ 938,372	(113,613)	(647,261)
Beginning Balance (shares) at Mar. 31, 2020		148,360
Common stock issued under employee benefit plans, net of shares withheld for tax	30	$ 30
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(351)	$ 351
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		278
Allocated share-based compensation expense	5,876	$ 5,876
Net loss	(50,975)			(50,975)
Ending Balance at Jun. 30, 2020	$ 132,078	$ 943,927	$ (113,613)	$ (698,236)
Ending Balance (shares) at Jun. 30, 2020		148,638

- Definition

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

+ References + Details

Condensed consolidated financial statement details - Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Business Combination, Goodwill [Abstract]
Goodwill	$ 146,459	$ 146,459

Accounting Policies

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Summary of significant accounting policies

1. Summary of business and significant accounting policies

GoPro, Inc. and its subsidiaries (GoPro or the Company) help its consumers celebrate and share their experiences in immersive and exciting ways. The Company is committed to developing solutions that create an easy, seamless experience for consumers to capture, create and share engaging personal content. To date, the Company’s cameras, mountable and wearable accessories, and subscription services have generated substantially all of its revenue. The Company sells its products globally on its website, and through retailers and wholesale distributors. The Company’s global corporate headquarters are located in San Mateo, California.

Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30.

The Company’s operating results, financial position and cash flows were negatively impacted by the COVID-19 pandemic and as a result, the Company accelerated a shift in its sales channel strategy to focus more on direct-to-consumer sales through gopro.com, and implemented a restructuring plan in April 2020, which primarily impacted the Company’s global workforce, sales and marketing expenses, and leased facilities. These actions impacted the Company’s financial results in the second quarter of 2020 by reducing on-going operating expenses and to help accelerate its ability to achieve profitability, thus providing sufficient resources to continue as a going concern for at least one year from the date of issuance of the condensed consolidated financial statements contained in this Quarterly Report on Form 10-Q.

The condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, that management believes are necessary for the fair statement of the Company's financial statements, but are not necessarily indicative of the results expected for the full fiscal year or any other future period. The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited financial statements at that date, but does not include all the disclosures required by GAAP. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K (Annual Report) for the year ended December 31, 2019. There have been no material changes in the Company’s critical accounting policies and estimates from those disclosed in its Annual Report.

Principles of consolidation. These condensed consolidated financial statements include all the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of estimates. The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s condensed consolidated financial statements and accompanying notes. Significant estimates and assumptions made by management include those related to revenue recognition (including sales incentives, sales returns and implied post contract support), inventory valuation, product warranty liabilities, the valuation, impairment and useful lives of long-lived assets (property and equipment, operating leases, intangible assets and goodwill), income taxes and going concern. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, including but not limited to the potential impacts arising from the COVID-19 pandemic, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The extent and continued impact of COVID-19 has been taken into account in making the significant assumptions and estimates related to the above, however if the duration and spread of the outbreak, the impact on our customers, and the effect on our contract manufacturers, vendors and supply chains is different from the Company’s estimates and assumptions, then actual results could differ materially. Given the uncertainty with respect to COVID-19, the Company’s estimates and assumptions may evolve as conditions change. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected.

Comprehensive income (loss). For all periods presented, comprehensive income (loss) approximated net income (loss). Therefore, the condensed consolidated statements of comprehensive income (loss) have been omitted.

Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. Operating leases are presented as operating lease right-of-use (ROU) assets, short-term operating lease liabilities and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. ROU assets represent the Company’s right to control the use of an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease.

Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of future lease payments. The Company determines its incremental borrowing rate based on the approximate rate at which the Company would borrow, on a secured basis, to calculate the present value of future lease payments. Lease expenses are recognized on a straight-line basis over the lease term. Certain leases include an option to renew with terms that can extend the lease term from one to five years. The exercise of a lease renewal option is at the Company’s sole discretion and is included in the lease term when the Company is reasonably certain it will exercise the option.

Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, the related implied post contract support to customers, and subscription services. The Company recognizes revenue when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The transaction price the Company expects to be entitled to is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is considered probable. For the Company’s subscription services, revenue is recognized on a ratable basis over the subscription term, with payments received in advance of services being rendered recorded in deferred revenue. For customers who purchase products directly from gopro.com, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred.

The Company's standard terms and conditions of sale for non-web-based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated return liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time but are sufficiently predictable to allow the Company to estimate expected future product returns.

The Company’s camera sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive support after the initial sale (post contract support or PCS). The Company’s PCS includes the right to receive on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company allocates a portion of the transaction price to the PCS performance obligation based on a cost-plus methodology. The transaction price is allocated to the remaining performance obligations on a residual value methodology. The Company’s process to allocate the transaction price considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company’s support, the amount of time and cost that is allocated to the Company’s efforts to develop the undelivered elements and market trends in the pricing for similar offerings.

The transaction prices allocated to the delivered hardware, related embedded firmware and free software solutions are recognized as revenue at the time of sale, provided the conditions for recognition of revenue have been met. The transaction price allocated to PCS is deferred and recognized as revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of June 30, 2020 and December 31, 2019 also included immaterial amounts related to the

Company’s subscription services. The Company’s short-term and long-term deferred revenue balances totaled $14.1 million and $16.6 million as of June 30, 2020 and December 31, 2019, respectively. During the three months ended June 30, 2020 and 2019, revenue of $5.5 million and $5.3 million, respectively, was recognized that was included in the deferred revenue balances at the beginning of each period. During the six months ended June 30, 2020 and 2019, revenue of $9.8 million and $9.7 million, respectively, was recognized that was included in the deferred revenue balances at the beginning of each period.

Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, price protection, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors.

Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker.

Recent accounting standards

Standard

Description

Company’s date of adoption

Effect on the condensed consolidated financial statements or other significant matters

Standards that were adopted

Intangible - Goodwill and Other

ASU No. 2017-04 (Topic 350)

This standard simplifies the accounting for goodwill and removes Step 2 of the annual goodwill impairment test. Upon adoption, goodwill impairment is determined based on the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The standard is applied on a prospective transition method.

January 1, 2020

The adoption of this standard did not impact the Company’s condensed consolidated financial statements and related disclosures.

Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments

ASU No. 2016-13

(Topic 326)

The standard changes the impairment model for most financial assets and replaces the existing incurred loss model with a current expected credit loss (CECL) model. The standard is applied on a modified retrospective approach.

January 1, 2020

The Company’s allowance for doubtful accounts and valuation of available-for-sale securities are subject to this standard. The Company concluded the adoption of this standard did not have a material impact on its condensed consolidated financial statements and related disclosures.

Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these accounting pronouncements has had or will have a material impact on its condensed consolidated financial statements.

Revenue from Contract with Customer

Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, the related implied post contract support to customers, and subscription services. The Company recognizes revenue when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The transaction price the Company expects to be entitled to is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is considered probable. For the Company’s subscription services, revenue is recognized on a ratable basis over the subscription term, with payments received in advance of services being rendered recorded in deferred revenue. For customers who purchase products directly from gopro.com, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred.

The Company's standard terms and conditions of sale for non-web-based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated return liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time but are sufficiently predictable to allow the Company to estimate expected future product returns.

The Company’s camera sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive support after the initial sale (post contract support or PCS). The Company’s PCS includes the right to receive on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company allocates a portion of the transaction price to the PCS performance obligation based on a cost-plus methodology. The transaction price is allocated to the remaining performance obligations on a residual value methodology. The Company’s process to allocate the transaction price considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company’s support, the amount of time and cost that is allocated to the Company’s efforts to develop the undelivered elements and market trends in the pricing for similar offerings.

The transaction prices allocated to the delivered hardware, related embedded firmware and free software solutions are recognized as revenue at the time of sale, provided the conditions for recognition of revenue have been met. The transaction price allocated to PCS is deferred and recognized as revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of June 30, 2020 and December 31, 2019 also included immaterial amounts related to the

Company’s subscription services. The Company’s short-term and long-term deferred revenue balances totaled $14.1 million and $16.6 million as of June 30, 2020 and December 31, 2019, respectively. During the three months ended June 30, 2020 and 2019, revenue of $5.5 million and $5.3 million, respectively, was recognized that was included in the deferred revenue balances at the beginning of each period. During the six months ended June 30, 2020 and 2019, revenue of $9.8 million and $9.7 million, respectively, was recognized that was included in the deferred revenue balances at the beginning of each period.

Fair value measurements

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value measurements

Fair value measurements

The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows:


	June 30, 2020										December 31, 2019
(in thousands)	Level 1		Level 2		Total		Level 1		Level 2			Total
Cash equivalents ⁽¹⁾:
Money market funds	$	19,442	$	—	$	19,442	$	4,413	$	—		$	4,413



Total cash equivalents	$	19,442	$	—	$	19,442	$	4,413	$	—		$	4,413
Marketable securities:


Corporate debt securities	$	—	$	—	$	—	$	—	$	14,847		$	14,847

Total marketable securities	$	—	$	—	$	—	$	—	$	14,847		$	14,847

⁽¹⁾Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $60.2 million and $145.9 million as of June 30, 2020 and December 31, 2019, respectively.

Cash equivalents and marketable securities are classified as Level 1 or Level 2 because the Company uses quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value. The contractual maturities of available-for-sale marketable securities as of December 31, 2019 were all less than one year in duration. At June 30, 2020 and December 31, 2019, the Company had no financial assets or liabilities that were classified as Level 3, which are valued based on inputs supported by little or no market activity.

At June 30, 2020 and December 31, 2019, the amortized cost of the Company’s cash equivalents and marketable securities approximated their fair value and there were no material realized or unrealized gains or losses, either individually or in the aggregate.

In April 2017, the Company issued $175.0 million principal amount of Convertible Senior Notes due 2022 (Notes) (see Note 4 Financing Arrangements). The estimated fair value of the Notes is based on quoted market prices of the Company’s instruments in markets that are not active and are classified as Level 2 within the fair value hierarchy. The Company estimated the fair value of the Notes by evaluating quoted market prices and calculating the upfront cash payment a market participant would require to assume these obligations. The calculated fair value of the Notes was $154.0 million as of June 30, 2020, and is highly correlated to the Company’s stock price and as a result, significant changes to the Company’s stock price will have a significant impact on the calculated fair value of the Notes.

For certain other financial assets and liabilities, including accounts receivable, accounts payable and other current assets and liabilities, the carrying amounts approximate their fair value primarily due to the relatively short maturity of these balances.

- 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

Employee benefit plans

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

Employee benefit plans

Employee benefit plans Equity incentive plans. The Company has outstanding equity grants from its three stock-based employee compensation plans: the 2014 Equity Incentive Plan (2014 Plan), the 2010 Equity Incentive Plan (2010 Plan) and the 2014 Employee Stock Purchase Plan (ESPP). No new options or awards have been granted under the 2010 Plan since June 2014. Outstanding options and awards under the 2010 Plan continue to be subject to the terms

and conditions of the 2010 Plan. Options granted under the 2014 Plan generally expire within ten years from the date of grant and generally vest over one to four years. Restricted stock units (RSUs) granted under the 2014 Plan generally vest over two to four years based upon continued service and are settled at vesting in shares of the Company’s Class A common stock. Performance stock units (PSUs) granted under the 2014 Plan generally vest over three years based upon continued service and the Company achieving certain revenue targets, and are settled at vesting in shares of the Company’s Class A common stock. The Company accounts for forfeitures of stock-based payment awards in the period they occur. The ESPP allows eligible employees to purchase shares of the Company’s Class A common stock through payroll deductions at a price equal to 85% of the lesser of the fair market value of the stock as of the first date or the ending date of each six-month offering period. For additional information regarding the Company’s equity incentive plans, refer to the 2019 Annual Report.

Stock options

A summary of the Company’s stock option activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average exercise price		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)




Outstanding at December 31, 2019	3,963	$	10.16	6.35	$	374
Granted	1,006	3.99
Exercised	(25)	1.13
Forfeited/Cancelled	(773)	9.88
Outstanding at June 30, 2020	4,171	$	8.78	6.59	$	1,064

Vested and expected to vest at June 30, 2020	4,171	$	8.78	6.59	$	1,064
Exercisable at June 30, 2020	2,676	$	10.93	5.12	$	324

The aggregate intrinsic value of the stock options outstanding as of June 30, 2020 represents the value of the Company’s closing stock price on June 30, 2020 in excess of the exercise price multiplied by the number of options outstanding.

Restricted stock units

A summary of the Company’s RSU activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average grant date fair value




Non-vested shares at December 31, 2019	8,225	$	6.11
Granted	5,604	4.09
Vested	(1,649)	6.78
Forfeited	(1,823)	5.50
Non-vested shares at June 30, 2020	10,357	$	5.02

Performance stock units

A summary of the Company’s PSU activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average grant date fair value
Non-vested shares at December 31, 2019	788	$	7.51
Granted	1,221	4.04
Vested	(179)	7.51
Forfeited	(205)	7.02
Non-vested shares at June 30, 2020	1,625	$	4.97

Employee stock purchase plan. For the six months ended June 30, 2020 and 2019, the Company issued 556,000 and 458,000 shares under its ESPP, respectively, at weighted-average prices of $3.38 and $4.96, respectively.

Stock-based compensation expense. The Company measures compensation expense for all stock-based payment awards based on the estimated fair values on the date of the grant. The fair value of stock options granted and ESPP issuance is estimated using the Black-Scholes option pricing model. The fair value of RSUs and PSUs are determined using the Company’s closing stock price on the date of grant. There have been no significant changes in the Company’s valuation assumptions from those disclosed in its 2019 Annual Report.

The following table summarizes stock-based compensation expense included in the condensed consolidated statements of operations:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Cost of revenue	$	332	$	522	$	835	$	1,035
Research and development	3,063		4,884		6,085		9,561
Sales and marketing	789		2,221		2,506		4,434
General and administrative	1,692		2,979		4,087		5,361
Total stock-based compensation expense	$	5,876	$	10,606	$	13,513	$	20,391

The income tax benefit related to stock-based compensation expense was zero for the three and six months ended June 30, 2020 and 2019 due to a full valuation allowance on the Company’s United States net deferred tax assets (see Note 7 Income taxes).

At June 30, 2020, total unearned stock-based compensation of $45.7 million related to stock options, RSUs, PSUs and ESPP shares is expected to be recognized over a weighted-average period of 2.3 years.

Net loss per share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Net loss per share

The following table presents the calculations of basic and diluted net loss per share:


	Three months ended June 30,						Six months ended June 30,
(in thousands, except per share data)	2020		2019		2020		2019
Numerator:
Net loss	$	(50,975)	$	(11,287)	$	(114,503)	$	(35,652)

Denominator:
Weighted-average common shares—basic and diluted for Class A and Class B common stock	148,497		144,668		148,028		143,640



Basic and diluted net loss per share	$	(0.34)	$	(0.08)	$	(0.77)	$	(0.25)

The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:


	Three months ended June 30,			Six months ended June 30,
(in thousands)	2020	2019	2020	2019
Anti-dilutive stock-based awards	15,057	12,817	14,519	12,870

The Company has the intent and ability to deliver cash up to the principal amount of the Notes subject to conversion, based on the Company’s current and projected liquidity. As such, no shares associated with the Note conversion were included in the Company’s weighted-average number of common shares outstanding for any periods presented. The Company’s Notes mature on April 15, 2022, unless earlier repurchased or converted into shares of Class A common stock under certain circumstances as described further in Note 4 Financing Arrangements. The Notes are convertible into cash, shares of the Company’s Class A common stock, or a combination thereof, at the Company’s election. While the Company has the intent and ability to deliver cash up to the principal amount, the maximum number of shares issuable upon conversion of the Notes is 20.6 million shares of Class A common stock. Additionally, the calculation of weighted-average shares outstanding for the three and six months ended June 30, 2020 and 2019 excludes approximately 9.2 million shares, effectively repurchased and held in treasury stock on the condensed consolidated balance sheets as a result of the Prepaid Forward transaction entered into in connection with the Note offering.

The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible at any time at the option of the stockholder into one share of Class A common stock and has no expiration date. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date when the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of common stock then outstanding. Class A common stock is not convertible into Class B common stock. The computation of the diluted net loss per share of Class A common stock assumes the conversion of Class B common stock.

Commitments, contingencies and guarantees

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments, contingencies and guarantees

Facility Leases. The Company leases its facilities under long-term operating leases, which expire at various dates through 2027.

The components of net lease cost, which were recorded in operating expenses, were as follows:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Operating lease cost ⁽¹⁾	$	4,088	$	4,459	$	8,295	$	9,564
Sublease income	(131)		(168)		(260)		(399)
Net lease cost	$	3,957	$	4,291	$	8,035	$	9,165

⁽¹⁾ Operating lease cost includes variable lease costs, which are immaterial.

Supplemental cash flow information related to leases was as follows:


	Six months ended June 30,
(in thousands)	2020		2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	7,441	$	6,551
Right-of-use assets obtained in exchange for new operating lease liabilities	147		10,780

Supplemental balance sheet information related to leases was as follows:


	June 30, 2020	December 31, 2019
Weighted-average remaining lease term (in years) - operating leases	6.04	6.44
Weighted-average discount rate - operating leases	6.2%	6.2%

As of June 30, 2020, maturities of operating lease liabilities were as follows:


(in thousands)	June 30, 2020
2020 (remaining 6 months)	$	6,102
2021	13,706
2022	12,804
2023	12,035
2024	11,897
Thereafter	25,065
Total lease payments	81,609
Less: Imputed interest	(14,524)
Present value of lease liabilities	$	67,085

Other Commitments. In the ordinary course of business, the Company enters into multi-year agreements to purchase sponsorships with event organizers, resorts and athletes as part of its marketing efforts; software licenses related to its financial and IT systems; debt agreements; and various other contractual commitments. As of June 30, 2020, the Company’s total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $215.8 million.

Legal proceedings and investigations. On February 13, 2018 and February 27, 2018, two purported shareholder derivative lawsuits (the Consolidated Federal Derivative Actions) were filed in the United States District Court for the Northern District of California against certain of GoPro’s current and former directors and executive officers and naming the Company as a nominal defendant. The Consolidated Federal Derivative Actions are based on allegations similar to those in two now-resolved shareholder class actions - one filed in 2016 which was settled and received final approval of the Court on September 20, 2019, and the other filed in 2018 which had final judgment entered in favor of defendants on June 24, 2019, following the Court’s granting of defendants’ motion to dismiss. The Consolidated Federal Derivative Actions assert causes of action against the individual defendants for breach of fiduciary duty, and for making false and misleading statements about the Company’s business, operations and prospects in violation of Sections 10(b) and 14(a) of the Securities Exchange Act of 1934. The plaintiffs seek corporate reforms, disgorgement of profits from stock sales, and fees and costs. On June 15, 2020, defendants moved to dismiss the complaint.

Different shareholders filed two similar purported shareholder derivative actions on October 30, 2018 and November 7, 2018 in the Delaware Court of Chancery (the Consolidated Delaware Derivative Actions). On April 28, 2020, the Court granted defendants’ motion to dismiss the Consolidated Delaware Derivative Actions with prejudice. On May 8, 2020, plaintiffs filed a notice of appeal.

Other shareholders filed similar purported shareholder derivative actions on December 26, 2018, February 15, 2019, and January 27, 2020 in the Delaware Court of Chancery. Those actions are either stayed or defendants’ time to respond to the complaint has not yet passed.

On January 5, 2015, Contour LLC filed a complaint against the Company in federal court in Utah alleging, among other things, patent infringement in relation to certain GoPro cameras. On November 30, 2015, Contour dismissed the Utah action. On November 30, 2015, Contour IP Holdings LLC (CIPH), a non-practicing entity re-filed a similar complaint in Delaware seeking unspecified damages. GoPro filed an inter partes review (IPR) at the United States Patent and Trademark Office. The case was transferred to the Northern District of California in July 2017 and was stayed in favor of the IPR proceedings, most recently on December 12, 2018. Upon conclusion of the IPRs, the District Court lifted the stay on October 1, 2019. On October 8, 2019, the court entered a schedule for the remainder of the case, including scheduling trial to begin on August 31, 2020. Due to COVID-19 delays, major deadlines in the case were extended, and trial is now scheduled to commence on December 14, 2020. We believe that this matter lacks merit and we intend to vigorously defend against CIPH.

We are currently, and in the future, may continue to be, subject to litigation, claims and assertions incidental to our business, including patent infringement litigation and product liability claims, as well as other litigation of a non-material nature in the ordinary course of business. Due to inherent uncertainties of litigation, we cannot accurately

predict the ultimate outcome of these matters. We are unable at this time to determine whether the outcome of the litigation would have a material effect on our business, financial condition, results of operations or cash flows.

Indemnifications. In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties, and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. It is not possible to determine the maximum potential amount under these indemnification agreements due to the Company’s limited history with indemnification claims and the unique facts and circumstances involved in each particular agreement. As of June 30, 2020, the Company has not paid any claims nor has it been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations.

Subsequent Events (Notes)	3 Months Ended
Subsequent Events (Notes)	Jun. 30, 2020
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent events On April 14, 2020, the Board of Directors approved the Company’s restructuring plan to reduce operating costs, optimize its business model and address the impact of the COVID-19 pandemic. The restructuring provided for a reduction in force of the Company’s global workforce of approximately 20% and is expected to be substantially completed by the end of the second quarter of 2020. The restructuring plan will result in an estimated aggregate charge of $31 million to $49 million. Cash expenditures will be approximately $5 million of the estimated aggregate charges in the second quarter of 2020 as a result of a reduction in force. The remaining expenditures are approximately $26 million to $44 million primarily pertaining to planned reductions of office space (including $4 million of non-cash charges) and approximately $5 million for other non-cash charges. The Company anticipates the majority of the office space charges will result in future cash expenditures through 2027. The Company anticipates that a substantial portion of these restructuring charges will be reflected in its second quarter results.

Summary of business and significant accounting policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30. The Company’s operating results, financial position and cash flows were negatively impacted by the COVID-19 pandemic and as a result, the Company accelerated a shift in its sales channel strategy to focus more on direct-to-consumer sales through gopro.com, and implemented a restructuring plan in April 2020, which primarily impacted the Company’s global workforce, sales and marketing expenses, and leased facilities. These actions impacted the Company’s financial results in the second quarter of 2020 by reducing on-going operating expenses and to help accelerate its ability to achieve profitability, thus providing sufficient resources to continue as a going concern for at least one year from the date of issuance of the condensed consolidated financial statements contained in this Quarterly Report on Form 10-Q. The condensed consolidated financial statements reflect all adjustments, which are normal and recurring in nature, that management believes are necessary for the fair statement of the Company's financial statements, but are not necessarily indicative of the results expected for the full fiscal year or any other future period. The condensed consolidated balance sheet at December 31, 2019 has been derived from the audited financial statements at that date, but does not include all the disclosures required by GAAP. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K (Annual Report) for the year ended December 31, 2019. There have been no material changes in the Company’s critical accounting policies and estimates from those disclosed in its Annual Report.
Principles of consolidation	Principles of consolidation. These condensed consolidated financial statements include all the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of estimates	Use of estimates. The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s condensed consolidated financial statements and accompanying notes. Significant estimates and assumptions made by management include those related to revenue recognition (including sales incentives, sales returns and implied post contract support), inventory valuation, product warranty liabilities, the valuation, impairment and useful lives of long-lived assets (property and equipment, operating leases, intangible assets and goodwill), income taxes and going concern. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, including but not limited to the potential impacts arising from the COVID-19 pandemic, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The extent and continued impact of COVID-19 has been taken into account in making the significant assumptions and estimates related to the above, however if the duration and spread of the outbreak, the impact on our customers, and the effect on our contract manufacturers, vendors and supply chains is different from the Company’s estimates and assumptions, then actual results could differ materially. Given the uncertainty with respect to COVID-19, the Company’s estimates and assumptions may evolve as conditions change. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected.
Comprehensive income (loss)	Comprehensive income (loss). For all periods presented, comprehensive income (loss) approximated net income (loss). Therefore, the condensed consolidated statements of comprehensive income (loss) have been omitted
Lessee, Operating Leases [Text Block]	Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. Operating leases are presented as operating lease right-of-use (ROU) assets, short-term operating lease liabilities and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. ROU assets represent the Company’s right to control the use of an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of future lease payments. The Company determines its incremental borrowing rate based on the approximate rate at which the Company would borrow, on a secured basis, to calculate the present value of future lease payments. Lease expenses are recognized on a straight-line basis over the lease term. Certain leases include an option to renew with terms that can extend the lease term from one to five years. The exercise of a lease renewal option is at the Company’s sole discretion and is included in the lease term when the Company is reasonably certain it will exercise the option.
Sales Incentives [Policy Text Block]	Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, price protection, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors.
Segment Reporting, Policy [Policy Text Block]	Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker.

Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Schedule of recent accounting pronouncements

Recent accounting standards

Standard

Description

Company’s date of adoption

Effect on the condensed consolidated financial statements or other significant matters

Standards that were adopted

Intangible - Goodwill and Other

ASU No. 2017-04 (Topic 350)

This standard simplifies the accounting for goodwill and removes Step 2 of the annual goodwill impairment test. Upon adoption, goodwill impairment is determined based on the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The standard is applied on a prospective transition method.

January 1, 2020

The adoption of this standard did not impact the Company’s condensed consolidated financial statements and related disclosures.

Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments

ASU No. 2016-13

(Topic 326)

The standard changes the impairment model for most financial assets and replaces the existing incurred loss model with a current expected credit loss (CECL) model. The standard is applied on a modified retrospective approach.

January 1, 2020

The Company’s allowance for doubtful accounts and valuation of available-for-sale securities are subject to this standard. The Company concluded the adoption of this standard did not have a material impact on its condensed consolidated financial statements and related disclosures.

Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these accounting pronouncements has had or will have a material impact on its condensed consolidated financial statement

Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Assets measured at fair value on recurring basis

The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows:


	June 30, 2020										December 31, 2019
(in thousands)	Level 1		Level 2		Total		Level 1		Level 2			Total
Cash equivalents ⁽¹⁾:
Money market funds	$	19,442	$	—	$	19,442	$	4,413	$	—		$	4,413



Total cash equivalents	$	19,442	$	—	$	19,442	$	4,413	$	—		$	4,413
Marketable securities:


Corporate debt securities	$	—	$	—	$	—	$	—	$	14,847		$	14,847

Total marketable securities	$	—	$	—	$	—	$	—	$	14,847		$	14,847

⁽¹⁾Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $60.2 million and $145.9 million as of June 30, 2020 and December 31, 2019, respectively.

Condensed consolidated financial statement details (Tables)

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Inventory

Inventory



(in thousands)	June 30, 2020		December 31, 2019
Components	$	24,232	$	20,370
Finished goods	117,919		123,866
Total inventory	$	142,151	$	144,236

Property, Plant and Equipment

Property and equipment, net



(in thousands)	June 30, 2020		December 31, 2019
Leasehold improvements	$	49,846	$	50,736
Production, engineering and other equipment	47,019		45,649
Tooling	18,223		19,216
Computers and software	22,431		21,719
Furniture and office equipment	10,527		10,846
Tradeshow equipment and other	7,083		7,009
Construction in progress	287		45
Gross property and equipment	155,416		155,220
Less: Accumulated depreciation and amortization	(126,236)		(118,681)
Property and equipment, net	$	29,180	$	36,539

Schedule of Finite-Lived Intangible Assets

Intangible assets


	June 30, 2020
(in thousands)	Gross carrying value		Accumulated amortization		Net carrying value
Purchased technology	$	51,066	$	(48,180)	$	2,886
Domain name	15		—		15
Total intangible assets	$	51,081	$	(48,180)	$	2,901


	December 31, 2019
(in thousands)	Gross carrying value		Accumulated amortization		Net carrying value
Purchased technology	$	50,501	$	(45,269)	$	5,232
Domain name	15		—		15
Total intangible assets	$	50,516	$	(45,269)	$	5,247

Schedule of Future Amortization

At June 30, 2020, expected amortization expense of intangible assets with definite lives for future periods was as follows:


(in thousands)	Total
Year ending December 31,
2020 (remaining 6 months)	$	1,687
2021	1,152
2022	47


	$	2,886

Schedule of Other Assets

Other long-term assets


(in thousands)	June 30, 2020		December 31, 2019
Point of purchase (POP) displays	$	6,023	$	7,595
Long-term deferred tax assets	811		864
Deposits and other	6,730		7,002
Other long-term assets	$	13,564	$	15,461

Schedule of Accrued Liabilities

Accrued expenses and other current liabilities



(in thousands)	June 30, 2020		December 31, 2019
Accrued payables ⁽¹⁾	$	28,970	$	42,153
Accrued sales incentives	23,701		39,120
Employee related liabilities ⁽¹⁾	6,574		20,494
Return liability	12,430		14,854
Warranty liability	5,679		9,899
Inventory received	1,281		5,737
Customer deposits	3,332		2,063
Purchase order commitments	2,083		1,710
Income taxes payable	1,101		1,166
Other	3,454		4,594
Accrued expenses and other current liabilities	$	88,605	$	141,790

Employee benefit plans (Tables)

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

schedule of share-based compensation, Performance Stock Units Award Activity [Table Text Block]

A summary of the Company’s PSU activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average grant date fair value
Non-vested shares at December 31, 2019	788	$	7.51
Granted	1,221	4.04
Vested	(179)	7.51
Forfeited	(205)	7.02
Non-vested shares at June 30, 2020	1,625	$	4.97

Schedule of Share-based Compensation, Stock Options, Activity

A summary of the Company’s stock option activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average exercise price		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)




Outstanding at December 31, 2019	3,963	$	10.16	6.35	$	374
Granted	1,006	3.99
Exercised	(25)	1.13
Forfeited/Cancelled	(773)	9.88
Outstanding at June 30, 2020	4,171	$	8.78	6.59	$	1,064

Vested and expected to vest at June 30, 2020	4,171	$	8.78	6.59	$	1,064
Exercisable at June 30, 2020	2,676	$	10.93	5.12	$	324

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of the Company’s RSU activity for the six months ended June 30, 2020 is as follows:


	Shares (in thousands)	Weighted-average grant date fair value




Non-vested shares at December 31, 2019	8,225	$	6.11
Granted	5,604	4.09
Vested	(1,649)	6.78
Forfeited	(1,823)	5.50
Non-vested shares at June 30, 2020	10,357	$	5.02

Allocation of Stock-based Compensation Expense

The following table summarizes stock-based compensation expense included in the condensed consolidated statements of operations:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Cost of revenue	$	332	$	522	$	835	$	1,035
Research and development	3,063		4,884		6,085		9,561
Sales and marketing	789		2,221		2,506		4,434
General and administrative	1,692		2,979		4,087		5,361
Total stock-based compensation expense	$	5,876	$	10,606	$	13,513	$	20,391

Net loss per share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Schedule of Net Income per Share, Basic and Diluted

The following table presents the calculations of basic and diluted net loss per share:


	Three months ended June 30,						Six months ended June 30,
(in thousands, except per share data)	2020		2019		2020		2019
Numerator:
Net loss	$	(50,975)	$	(11,287)	$	(114,503)	$	(35,652)

Denominator:
Weighted-average common shares—basic and diluted for Class A and Class B common stock	148,497		144,668		148,028		143,640



Basic and diluted net loss per share	$	(0.34)	$	(0.08)	$	(0.77)	$	(0.25)

Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share

The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:


	Three months ended June 30,			Six months ended June 30,
(in thousands)	2020	2019	2020	2019
Anti-dilutive stock-based awards	15,057	12,817	14,519	12,870

Income taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]


	Three months ended June 30,									Six months ended June 30,
(dollars in thousands)	2020			2019			2020			2019
Income tax expense (benefit)	$	1,069		$	(605)		$	3,468		$	(227)
Effective tax rate	(2.1)		%	5.1		%	(3.1)		%	0.6		%

Commitments, contingencies and guarantees (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Components of Lease Expense [Text Block]

The components of net lease cost, which were recorded in operating expenses, were as follows:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Operating lease cost ⁽¹⁾	$	4,088	$	4,459	$	8,295	$	9,564
Sublease income	(131)		(168)		(260)		(399)
Net lease cost	$	3,957	$	4,291	$	8,035	$	9,165

⁽¹⁾ Operating lease cost includes variable lease costs, which are immaterial.

Schedule of Supplemental Cash Flow Information Related To Leases [Text Block]

Supplemental cash flow information related to leases was as follows:


	Six months ended June 30,
(in thousands)	2020		2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	7,441	$	6,551
Right-of-use assets obtained in exchange for new operating lease liabilities	147		10,780

Supplemental balance sheet information related to leases was as follows:


	June 30, 2020	December 31, 2019
Weighted-average remaining lease term (in years) - operating leases	6.04	6.44
Weighted-average discount rate - operating leases	6.2%	6.2%

Schedule of Maturities of Lease Liabilities [Text Block]

As of June 30, 2020, maturities of operating lease liabilities were as follows:


(in thousands)	June 30, 2020
2020 (remaining 6 months)	$	6,102
2021	13,706
2022	12,804
2023	12,035
2024	11,897
Thereafter	25,065
Total lease payments	81,609
Less: Imputed interest	(14,524)
Present value of lease liabilities	$	67,085

Concentrations of risk and geographic information (Tables)

6 Months Ended

Jun. 30, 2020

Concentration Risk [Line Items]

Schedule of Accounts, Notes, Loans and Financing Receivable

The following table summarizes the Company’s accounts receivables sold, without recourse, and factoring fees paid:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Accounts receivable sold	$	4,242	$	38,525	$	35,561	$	54,948
Factoring fees	38		478		186		698

Schedule of Revenue by Geographic Region

Revenue by geographic region was as follows:


	Three months ended June 30,						Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Americas	$	82,640	$	142,267	$	139,887	$	251,341
Europe, Middle East and Africa (EMEA)	34,909		82,893		64,628		153,759
Asia and Pacific (APAC)	16,697		67,269		49,131		130,037
Total revenue	$	134,246	$	292,429	$	253,646	$	535,137

Accounts Receivable [Member]

Concentration Risk [Line Items]

Schedules of Customer Concentration by Risk Factor

Customers who represented 10% or more of the Company’s net accounts receivable balance were as follows:


	June 30, 2020	December 31, 2019
Customer A	*	15%
Customer B	24%	11%
Customer C	24%	*
Customer D	10%	*

* Less than 10% of net accounts receivable for the period indicated.

Sales Revenue [Member]

Concentration Risk [Line Items]

Schedules of Customer Concentration by Risk Factor

Customers who represented 10% or more of the Company’s total revenue were as follows:

Three months ended June 30,

Six months ended June 30,

2020

2019

2020

2019

Customer A

*

17%

*

15%

Customer B

13%

*

Customer C

10%

*

* Less than 10% of total revenue for the period indicated.

Restructuring charges (Tables)

6 Months Ended

Jun. 30, 2020

Restructuring Cost and Reserve [Line Items]

Restructuring and Related Costs

Restructuring charges for each period were as follows:


	Six months ended June 30,
(in thousands)	2020		2019
Cost of revenue	$	332	$	54
Research and development	2,500		556
Sales and marketing	7,215		314
General and administrative	1,240		501
Total restructuring charges	$	11,287	$	1,425

Schedule of Restructuring Reserve by Type of Cost

The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities, and other long-term liabilities on the condensed consolidated balance sheet under the first quarter 2017 restructuring plan.


(in thousands)	Severance		Other		Total












Restructuring liability as of December 31, 2019	$	—	$	4,470	$	4,470
Restructuring charges	—		(73)		(73)
Cash paid	—		(1,736)		(1,736)

Restructuring liability as of June 30, 2020	$	—	$	2,661	$	2,661

Summary of business and significant accounting policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Document Period End Date			Jun. 30, 2020
Deferred Revenue	$ 14.1		$ 14.1		$ 16.6
Deferred Revenue, Revenue Recognized	$ 5.5	$ 5.3	$ 9.8	$ 9.7

Fair value measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Apr. 12, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	$ 60,200	$ 145,900
Marketable securities	0	14,847
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	154,000
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	19,442	4,413
Marketable securities	0	14,847
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	14,847
Fair Value, Recurring [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	19,442	4,413
Fair Value, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	19,442	4,413
Marketable securities	0	0
Fair Value, Recurring [Member] \| Level 1 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Recurring [Member] \| Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	19,442	4,413
Fair Value, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Marketable securities	0	14,847
Fair Value, Recurring [Member] \| Level 2 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	14,847
Fair Value, Recurring [Member] \| Level 2 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 0	$ 0
Convertible Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument			$ 175,000

Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 0	$ 14,847
Cash	60,200	145,900
Cash and cash equivalents	79,679	150,301	$ 91,250	$ 152,095
Fair Value, Recurring [Member]
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 0	$ 14,847

Condensed consolidated financial statement details - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 24,232	$ 20,370
Finished goods	117,919	123,866
Total inventory	$ 142,151	$ 144,236

Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 155,416	$ 155,220
Less: Accumulated depreciation and amortization	(126,236)	(118,681)
Property and equipment, net	29,180	36,539
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	49,846	50,736
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	47,019	45,649
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	18,223	19,216
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	22,431	21,719
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	10,527	10,846
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	7,083	7,009
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 287	$ 45

Condensed consolidated financial statement details - Intangible Assets and Goodwill (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, Net [Abstract]
Gross carrying value	$ 51,066		$ 51,066		$ 50,501
Accumulated amortization	(48,180)		(48,180)		(45,269)
Net carrying value	2,886		2,886		5,232
Intangible Assets, Gross (Excluding Goodwill)	51,081		51,081		50,516
Intangible assets, net	2,901		2,901		5,247
Indefinite-lived Intangible Assets [Roll Forward]
Amortization of intangible assets	1,000	$ 2,000	2,900	$ 4,100
Goodwill	146,459		146,459		146,459
Indefinite-Lived Trademarks	$ 15		$ 15		$ 15

Condensed consolidated financial statement details - Future Amortization (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2020	$ 1,687
2021	1,152
Net carrying value	2,886	$ 5,232
Finite-Lived Intangible Assets, Amortization Expense, Year Three	$ 47

Condensed consolidated financial statement details - Other Assets (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]
POP Displays	$ 6,023		$ 6,023		$ 7,595
Deferred Tax Assets, Net	811		811		864
Deposits and other	6,730		6,730		7,002
Other long-term assets	13,564		13,564		$ 15,461
Amortization of intangible assets	$ 1,000	$ 2,000	$ 2,900	$ 4,100

Condensed consolidated financial statement details - Accrued Liabilities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Employee related liabilities	$ 6,574,000	$ 20,494,000
Accrued sales incentives	23,701,000	39,120,000
Other Accounts Payable and Accrued Liabilities	28,970,000	42,153,000
Customer Refund Liability, Current	12,430,000	14,854,000
Warranty liability	5,679,000	9,899,000
Customer deposits	3,332,000	2,063,000
Income taxes payable	1,101,000	1,166,000
Purchase Commitment, Remaining Minimum Amount Committed	2,083,000	1,710,000
Inventory received	1,281,000	5,737,000
Other	3,454,000	4,594,000
Accrued expenses and other current liabilities	$ 88,605,000	$ 141,790,000

Condensed consolidated financial statement details - Product Warranty (Details) - USD ($)	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]
Beginning balances	$ 8,954,000	$ 11,593,000	$ 11,398,000	$ 10,971,000
Charged to cost of revenue	1,269,000	4,254,000	2,986,000	10,403,000
Settlements of warranty claims	(2,897,000)	(2,997,000)	(7,058,000)	(8,524,000)
Ending balances	7,326,000	$ 12,850,000	7,326,000	$ 12,850,000
Warranty liability	5,679,000		5,679,000		$ 9,899,000
Product Warranty Accrual, Noncurrent	$ 1,600,000		$ 1,600,000		$ 1,500,000

Financing Arrangements (Details) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 12, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Credit agreement, current borrowing capacity			$ 58,500,000		$ 58,500,000
Document Period End Date					Jun. 30, 2020
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 128,300,000
Convertible debt, equity portion	46,700,000
Long-term debt			154,063,000		$ 154,063,000		$ 148,810,000
Amortization of Debt Discount (Premium)					$ 4,850,000	$ 4,378,000
Payments for Repurchase of Equity, Prepaid Forward	$ 78,000,000.0
Treasury Shares Acquired, Estimated, Prepaid Forward \| shares	9.2				9.2	9.2
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit agreement, current borrowing capacity		$ 250,000,000.0
Debt, Current			30,000,000.0		$ 30,000,000.0
Credit agreement, maximum borrowing capacity		300,000,000.0
Minimum Fixed Charge Coverage Ratio, minimum balance		$ 25,000,000.0
Minimum Fixed Charge Coverage Ratio, minimum percent		10.00%
Amount outstanding							0
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Instrument	$ 175,000,000.0
Debt Instrument, Unamortized Discount			19,400,000		19,400,000		24,300,000
Interest rate	3.50%
Debt Instrument, Convertible, Conversion Ratio	94.0071
Convertible Debt Principal Amount Conversion	$ 1,000		$ 175,000,000.0		175,000,000.0		175,000,000.0
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 10.64
Effective rate	10.50%
Debt Issuance Costs, Net	$ 5,700,000
Percentage of conversion price of notes			130.00%
Percentage of trading price of notes			98.00%
Long-term debt			$ 154,100,000		154,100,000		148,800,000
Interest Expense, Debt			1,600,000	$ 1,600,000	3,100,000	$ 3,100,000
Amortization of Debt Issuance Costs			200,000	200,000	400,000	400,000
Amortization of Debt Discount (Premium)			2,500,000	$ 2,300,000	4,900,000	$ 4,400,000
Long-term Debt [Member] \| Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross	4,200,000
Debt Issuance Costs, Net			$ 1,500,000		$ 1,500,000		$ 1,900,000
Additional Paid-in Capital [Member] \| Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross	$ 1,500,000
Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage		0.25%
Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage		0.375%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		1.50%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		2.00%
Base Rate [Member] \| Minimum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		0.50%
Base Rate [Member] \| Maximum [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		1.00%

Employee benefit plans - Narrative (Details) - USD ($)	3 Months Ended				6 Months Ended
Employee benefit plans - Narrative (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 5,876,000	$ 7,637,000	$ 10,606,000	$ 9,782,000
ESPP stock issued during period (shares)					556,000	458,000
ESPP weighted average purchase price of shares purchased (usd per share)					$ 3.38	$ 4.96
Unearned stock-based compensation, expected recognition period					2 years 3 months 18 days
Share-based Payment Arrangement, Expense, Tax Benefit	0		$ 0		$ 0	$ 0
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)					5,604,000
Weighted average price of shares granted (usd per share)					$ 4.09
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)					1,221,000
Weighted average price of shares granted (usd per share)					$ 4.04
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase Price of Common Stock, Percent					85.00%
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs	$ 45,700,000				$ 45,700,000
2014 Equity Incentive Plans [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period					10 years
2014 Equity Incentive Plans [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period					3 years
2014 Equity Incentive Plans [Member] \| Minimum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period					1 year
2014 Equity Incentive Plans [Member] \| Minimum [Member] \| RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period					2 years
2014 Equity Incentive Plans [Member] \| Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period					4 years
2014 Equity Incentive Plans [Member] \| Maximum [Member] \| RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period					4 years

Employee benefit plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Shares (in thousands)
Outstanding at beginning of period (shares)	3,963
Granted (shares)	1,006
Exercised (shares)	(25)
Forfeited/Cancelled (shares)	(773)
Outstanding at end of period (shares)	4,171	3,963
Weighted-average exercise price
Outstanding at beginning of period (in dollars per share)	$ 10.16
Granted (usd per share)	3.99
Exercised (usd per share)	1.13
Outstanding at end of period (in dollars per share)	$ 8.78	$ 10.16
Weighted Average Remaining Contractual Term (in years)	6 years 7 months 2 days	6 years 4 months 6 days
Aggregate intrinsic value (in thousands)	$ 1,064	$ 374
Vested and Expected to Vest (shares)	4,171
Vested and Expected to Vest - Weighted Average Exercise Price (in dollars per share)	$ 8.78
Vested and Expected to Vest- Weighted Average Remaining Contractual Term	6 years 7 months 2 days
Vested and Expected to Vest - Aggregate Intrinsic Value	$ 1,064
Exercisable (shares)	2,676
Exercisable - Weighted average exercise price (in dollars per share)	$ 10.93
Exercisable - Weighted Average Remaining Contractual Term	5 years 1 month 13 days
Exercisable - Aggregate intrinsic value	$ 324
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 9.88

Employee benefit plans - Restricted Stock Units Activity (Details) - RSUs [Member] shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Shares (in thousands)
Non-vested shares at beginning of period (shares) \| shares	8,225
Granted (shares) \| shares	5,604
Vested (shares) \| shares	(1,649)
Forfeited (shares) \| shares	(1,823)
Non-vested shares at end of period (shares) \| shares	10,357
Weighted-average grant date fair value
Non-vested shares at beginning of period (in dollars per share) \| $ / shares	$ 6.11
Weighted average price of shares granted (usd per share) \| $ / shares	4.09
Weighted average price of shares vested (usd per share) \| $ / shares	6.78
Weighted average price of shares forfeited (usd per share) \| $ / shares	5.50
Non-vested shares at end of period (in dollars per share) \| $ / shares	$ 5.02

Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) - USD ($)	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	$ 5,876,000	$ 10,606,000	$ 13,513,000	$ 20,391,000
Share-based Payment Arrangement, Expense, Tax Benefit	0	0	0	0
Cost of Revenue [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	332,000	522,000	835,000	1,035,000
Research and Development [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	3,063,000	4,884,000	6,085,000	9,561,000
Selling and Marketing Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	789,000	2,221,000	2,506,000	4,434,000
General and Administrative [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 1,692,000	$ 2,979,000	$ 4,087,000	$ 5,361,000

Employee benefit plans Performance Stock Units activity (Details) - Performance Shares [Member] - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (shares)	1,625	788
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 4.97	$ 7.51
Granted (shares)	1,221
Weighted average price of shares granted (usd per share)	$ 4.04
Vested (shares)	(179)
Weighted average price of shares vested (usd per share)	$ 7.51
Forfeited (shares)	(205)
Weighted average price of shares forfeited (usd per share)	$ 7.02

Net loss per share Additional Information (Details) - USD ($) $ in Millions		6 Months Ended
	Apr. 12, 2017	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Document Period End Date		Jun. 30, 2020
Treasury Shares Acquired, Estimated, Prepaid Forward	9,200,000	9,200,000	9,200,000
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number		1
Conversion of Stock, Shares Issued		1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number		10
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument	$ 175.0
Interest rate	3.50%
Maximum number of shares issuable upon conversion of the notes	20,600,000

Net loss per share - Basic and Diluted Net Income per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
	Apr. 12, 2017	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Treasury Shares Acquired, Estimated, Prepaid Forward	9,200					9,200	9,200
Numerator:
Net loss		$ (50,975)	$ (63,528)	$ (11,287)	$ (24,365)	$ (114,503)	$ (35,652)
Denominator:
Weighted-average common shares—basic for Class A and Class B common stock (shares)		148,497		144,668		148,028	143,640
Earnings Per Share, Basic and Diluted		$ (0.34)		$ (0.08)		$ (0.77)	$ (0.25)

- 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 - Antidilutive Securities Excluded from Computation of Net Income per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	15,057	12,817	14,519	12,870

Income taxes Income Taxes (Details) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (49,906)	$ (11,892)	$ (111,035)	$ (35,879)
Income tax (benefit) expense	$ (1,069)	$ 605	$ (3,468)	$ 227
Effective Income Tax Rate Reconciliation, Percent	(2.10%)	5.10%	(3.10%)	0.60%
Other Tax Expense (Benefit)		$ 100		$ 300

Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 1,069	$ (605)	$ 3,468	$ (227)
Effective Income Tax Rate Reconciliation, Percent	(2.10%)	5.10%	(3.10%)	0.60%
Current Foreign Tax Expense (Benefit)	$ 600	$ 400	$ 2,900	$ 900

Income taxes - Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 14.1
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 0.5

Income taxes - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Income taxes - Narrative (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 13,000,000.0		$ 13,000,000.0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	800,000		2,000,000.0	$ 1,400,000
Income Tax Effects Allocated Directly to Equity, Other	700,000	$ 400,000	1,800,000	900,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions				500,000
Tax Adjustments, Settlements, and Unusual Provisions		900,000		900,000
Other Tax Expense (Benefit)		100,000		300,000
Unrecognized Tax Benefits	28,700,000		28,700,000		$ 27,200,000
Current Foreign Tax Expense (Benefit)	600,000	400,000	2,900,000	900,000
Loss before income taxes	(49,906,000)	(11,892,000)	(111,035,000)	(35,879,000)
Income tax (benefit) expense	1,069,000	(605,000)	3,468,000	(227,000)
Unrecognized Tax Benefits, Period Increase (Decrease)	500,000		500,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	2,600,000		2,600,000
Restructuring adjustments	$ 2,400,000	$ 400,000	$ 2,400,000	$ 500,000

Commitments, contingencies and guarantees - Narrative (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
Long-term Purchase Commitment [Line Items]
Operating Lease, Cost	$ 4,088	$ 4,459	$ 8,295	$ 9,564
Operating Lease, Payments			$ 7,441	6,551
Document Period End Date			Jun. 30, 2020
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	6,102		$ 6,102
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	13,706		13,706
Lessee, Operating Lease, Liability, Payments, Due Year Two	12,804		12,804
Lessee, Operating Lease, Liability, Payments, Due Year Three	12,035		12,035
Lessee, Operating Lease, Liability, Payments, Due Year Five	11,897		11,897
Lessee, Operating Lease, Liability, Payments, Due after Year Five	25,065		25,065
Lessee, Operating Lease, Liability, Payments, Due	81,609		81,609
us-gaap_Lessee Operating Lease Liability Undiscounted Excess Amount	(14,524)		(14,524)
Other Commitment	$ 215,800		215,800
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 147	10,780
Operating Lease, Weighted Average Remaining Lease Term	6 years 14 days		6 years 14 days		6 years 5 months 8 days
Operating Lease, Weighted Average Discount Rate, Percent	6.20%		6.20%		6.20%
Operating Lease, Liability	$ 67,085		$ 67,085
Sublease Income	(131)	(168)	(260)	(399)
Lease, Cost	$ 3,957	$ 4,291	$ 8,035	$ 9,165

Concentrations of risk and geographic information - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Revenue	$ 134,246,000	$ 292,429,000	$ 253,646,000	$ 535,137,000
Document Period End Date			Jun. 30, 2020
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	76,800,000	$ 117,700,000	$ 122,500,000	$ 200,700,000
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 8,500,000		$ 8,500,000		$ 11,000,000.0

Concentrations of risk and geographic information - Schedule of Customer Concentration by Risk Factor (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Document Period End Date			Jun. 30, 2020
Accounts receivable sold	$ 4,242	$ 38,525	$ 35,561	$ 54,948
Factoring fees	$ 38	$ 478	$ 186	$ 698
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer A [Member]
Concentration Risk [Line Items]
Concentration risk					15.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer B [Member]
Concentration Risk [Line Items]
Concentration risk			24.00%		11.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer C [Member]
Concentration Risk [Line Items]
Concentration risk			24.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer D
Concentration Risk [Line Items]
Concentration risk			10.00%
Customer Concentration Risk [Member] \| Sales Revenue [Member] \| Customer A [Member]
Concentration Risk [Line Items]
Concentration risk		17.00%		15.00%
Customer Concentration Risk [Member] \| Sales Revenue [Member] \| Customer B [Member]
Concentration Risk [Line Items]
Concentration risk	13.00%
Customer Concentration Risk [Member] \| Sales Revenue [Member] \| Customer C [Member]
Concentration Risk [Line Items]
Concentration risk	10.00%

Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 134,246,000	$ 292,429,000	$ 253,646,000	$ 535,137,000
United States [Member]
Segment Reporting Information [Line Items]
Revenue	76,800,000	117,700,000	122,500,000	200,700,000
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	82,640,000	142,267,000	139,887,000	251,341,000
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	34,909,000	82,893,000	64,628,000	153,759,000
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 16,697,000	$ 67,269,000	$ 49,131,000	$ 130,037,000

Restructuring charges - Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2017	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 11,287	$ 1,425
Cost of Revenue [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			332	54
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2,500	556
Selling and Marketing Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			7,215	314
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,240	$ 501
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 23,100
Restructuring charges			(73)
Restructuring Reserve	$ 2,661		2,661		$ 4,470
Other Restructuring Costs			(73)
Cash paid			(1,736)
First quarter 2017 restructuring [Member] \| Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		12,800
First quarter 2017 restructuring [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0		0		0
Severance Costs		$ 10,300	0
Cash paid			0
First quarter 2017 restructuring [Member] \| Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,661		2,661		4,470
Cash paid			(1,736)
Second quarter 2020 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	11,500
Restructuring charges			11,492
Restructuring Reserve	1,548		1,548		0
Other Restructuring Costs			3,584
Cash paid			(6,648)
Restructuring Reserve, Settled without Cash			(3,296)
Second quarter 2020 restructuring [Member] \| Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,600
Second quarter 2020 restructuring [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,548		1,548		0
Severance Costs	7,900		7,908
Cash paid			(6,360)
Restructuring Reserve, Settled without Cash			0
Second quarter 2020 restructuring [Member] \| Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0		0		$ 0
Cash paid			(288)
Restructuring Reserve, Settled without Cash			$ (3,296)

Restructuring charges (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
Restructuring charges (Details) - USD ($) $ in Thousands	Apr. 14, 2020	Mar. 15, 2017	Jun. 30, 2020	Jun. 30, 2017	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 11,287	$ 1,425
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated		17.00%
Restructuring charges				$ 23,100
Other Restructuring Costs					(73)
First quarter 2017 restructuring [Member] \| Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				12,800
First quarter 2017 restructuring [Member] \| Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs				$ 10,300	0
Second quarter 2020 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	20.00%
Restructuring charges			$ 11,500
Other Restructuring Costs					3,584
Second quarter 2020 restructuring [Member] \| Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			3,600
Second quarter 2020 restructuring [Member] \| Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 7,900		$ 7,908

Restructuring charges - Restructuring Liability (Details) - First quarter 2017 restructuring [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs		$ (73)
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470
Restructuring charges		(73)
Cash paid		(1,736)
Restructuring liability as of December 31, 2017		2,661
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 10,300	0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		0
Cash paid		0
Restructuring liability as of December 31, 2017		0
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470
Cash paid		(1,736)
Restructuring liability as of December 31, 2017		$ 2,661

Subsequent Events (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Subsequent Event [Line Items]
Restructuring charges		$ 11,287	$ 1,425
Subsequent Event [Member] \| Minimum [Member]
Subsequent Event [Line Items]
Restructuring charges	$ 31,000
Restructuring Costs and Asset Impairment Charges	26,000
Subsequent Event [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Restructuring charges	49,000
Restructuring Costs and Asset Impairment Charges	44,000
Subsequent Event [Member] \| Employee Severance [Member]
Subsequent Event [Line Items]
Severance Costs	5,000
Subsequent Event [Member] \| Leasehold Improvements [Member]
Subsequent Event [Line Items]
Restructuring charges	4,000
Subsequent Event [Member] \| point of purchase (POP) Displays [Domain]
Subsequent Event [Line Items]
Restructuring charges	$ 5,000