GOPRO, INC., 10-Q filed on 11/3/2017
Quarterly Report
Document, Entity and Information
9 Months Ended
Sep. 30, 2017
Class of Stock [Line Items]
 
Entity Registrant Name
GoPro, Inc. 
Entity Central Index Key
0001500435 
Current Fiscal Year End Date
--12-31 
Entity Filer Category
Large Accelerated Filer 
Document Type
10-Q 
Document Period End Date
Sep. 30, 2017 
Document Fiscal Year Focus
2017 
Document Fiscal Period Focus
Q3 
Amendment Flag
false 
Common Class A [Member]
 
Class of Stock [Line Items]
 
Entity Common Stock, Shares Outstanding
109,285,755 
Common Class B [Member]
 
Class of Stock [Line Items]
 
Entity Common Stock, Shares Outstanding
36,673,286 
Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Current assets:
 
 
Cash and cash equivalents
$ 164,616 
$ 192,114 
Marketable securities
31,946 
25,839 
Accounts receivable, net
100,026 
164,553 
Inventory
177,190 
167,192 
Prepaid expenses and other current assets
36,471 
38,115 
Total current assets
510,249 
587,813 
Property and equipment, net
74,196 
76,509 
Intangible assets, net
26,860 
33,530 
Goodwill
146,459 
146,459 
Other long-term assets
67,665 
78,329 
Total assets
825,429 
922,640 
Current liabilities:
 
 
Accounts payable
143,054 
205,028 
Accrued liabilities
149,395 
211,323 
Deferred revenue
16,301 
14,388 
Total current liabilities
308,750 
430,739 
Long-term taxes payable
21,670 
26,386 
Long-term Debt
127,861 
0 
Other long-term liabilities
26,878 
18,570 
Total liabilities
485,159 
475,695 
Commitments, contingencies and guarantees
   
   
Stockholders’ equity:
 
 
Preferred stock, $0.0001 par value, 5,000 shares authorized; none issued
0 
0 
Common stock and additional paid-in capital, $0.0001 par value, 500,000 Class A shares authorized, 100,079 and 104,647 shares issued and outstanding, respectively; 150,000 Class B shares authorized, 36,673 and 36,712 shares issued and outstanding, respectively
840,169 
757,226 
Treasury stock, at cost, 10,710 and 1,545 shares, respectively
(113,613)
(35,613)
Accumulated deficit
(386,286)
(274,668)
Total stockholders’ equity
340,270 
446,945 
Total liabilities and stockholders’ equity
$ 825,429 
$ 922,640 
Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2016
Dec. 31, 2015
Preferred Stock, par value (usd per share)
$ 0.0001 
$ 0.0001 
Preferred Stock, Shares Authorized (shares)
5,000,000 
5,000,000 
Preferred Stock, Shares Issued (shares)
0 
0 
Common stock, par value (in dollars per share)
$ 0.0001 
$ 0.0001 
Treasury Stock, Shares (shares)
10,710,000 
1,545,000 
Common Class A [Member]
 
 
Common Stock, Shares Authorized (shares)
500,000,000 
500,000,000 
Common Stock, Shares, Issued (shares)
100,079,000 
104,647,000 
Common stock, shares, outstanding (shares)
100,079,000 
104,647,000 
Common Class B [Member]
 
 
Common Stock, Shares Authorized (shares)
150,000,000 
150,000,000 
Common Stock, Shares, Issued (shares)
36,673,000 
36,712,000 
Common stock, shares, outstanding (shares)
36,673,000 
36,712,000 
Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]
 
 
 
 
Revenue
$ 329,805 
$ 240,569 
$ 844,945 
$ 644,860 
Cost of revenue
199,259 
143,500 
540,201 
395,075 
Gross profit
130,546 
97,069 
304,744 
249,785 
Operating expenses:
 
 
 
 
Research and development
55,098 
96,146 
176,761 
266,174 
Sales and marketing
46,622 
91,567 
171,156 
255,904 
General and administrative
20,777 
24,945 
61,976 
74,108 
Total operating expenses
122,497 
212,658 
409,893 
596,186 
Operating income (loss)
8,049 
(115,589)
(105,149)
(346,401)
Interest Expense
(4,554)
(1,156)
(9,152)
(1,815)
Other income, net
322 
348 
705 
1,360 
Total other income (expense), net
(4,232)
(808)
(8,447)
(455)
Income (loss) before income taxes
3,817 
(116,397)
(113,596)
(346,856)
Income tax expense (benefit)
(10,844)
(12,329)
13,429 
(43,562)
Net Income (loss)
$ 14,661 
$ (104,068)
$ (127,025)
$ (303,294)
Net income per share attributable to common stockholders - Basic (in dollars per share)
$ 0.11 
$ (0.74)
$ (0.92)
$ (2.18)
Net income per share attributable to common stockholders - Diluted (in dollars per share)
$ 0.10 
$ (0.74)
$ (0.92)
$ (2.18)
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares)
136,236 
140,124 
138,450 
138,875 
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares)
140,288 
140,124 
138,450 
138,875 
Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Cash Flows [Abstract]
 
 
Net loss
$ (127,025)
$ (303,294)
Adjustments to reconcile net loss to net cash used in operating activities:
 
 
Depreciation and amortization
32,260 
30,540 
Stock-based compensation
36,235 
51,601 
Excess tax benefit from stock-based compensation (1)
0 
(2,374)
Deferred income taxes
(1,818)
(20,956)
Non-cash restructuring charges
3,859 
0 
Non-cash interest expense
3,366 
0 
Asset Impairment Charges
0 
6,000 
Other
3,891 
4,754 
Changes in operating assets and liabilities:
 
 
Accounts receivable, net
64,874 
53,706 
Inventory
(9,998)
43,001 
Prepaid expenses and other assets
4,850 
(10,526)
Accounts payable and other liabilities
(106,432)
28,584 
Deferred revenue
2,095 
(1,485)
Net cash provided by (used in) operating activities
(93,843)
(120,449)
Investing activities:
 
 
Purchases of property and equipment, net
(18,313)
(26,516)
Purchases of marketable securities
31,918 
0 
Maturities of marketable securities
14,160 
93,224 
Sale of marketable securities
11,623 
6,791 
Acquisitions, net of cash acquired
0 
(104,353)
Net cash provided by (used in) investing activities
(24,448)
(30,854)
Financing activities:
 
 
Proceeds from issuance of common stock
9,623 
6,202 
Payments Related to Tax Withholding for Share-based Compensation
(11,278)
(860)
Proceeds from issuance of Convertible senior notes
175,000 
0 
Payments for Repurchase of Common Stock
(78,000)
0 
Excess tax benefit from stock-based compensation (1)
0 1
2,374 1
Payment of deferred acquisition-related consideration
(76)
(950)
Payment of debt issuance costs
(5,963)
(3,287)
Net cash provided by financing activities
89,306 
3,479 
Effect of exchange rate changes on cash and cash equivalents
1,487 
(271)
Net decrease in cash and cash equivalents
(27,498)
(148,095)
Cash and cash equivalents at beginning of period
192,114 
279,672 
Cash and cash equivalents at end of period
$ 164,616 
$ 131,577 
Summary of business and significant accounting policies
Summary of significant accounting policies
Summary of business and significant accounting policies
GoPro, Inc. (GoPro or the Company) makes mountable and wearable cameras, drones and accessories. The Company's products are sold globally through retailers, wholesale distributors and on the Company’s website. 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 U.S. 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 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, 2016 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, 2016. There have been no significant changes in the Company’s accounting policies 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 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 returns, implied post contract support and marketing allowances), stock-based compensation, inventory valuation, product warranty liabilities, the valuation and useful lives of long-lived assets (property and equipment, intangible assets and goodwill) and income taxes. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, 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. Actual results could differ materially from management's estimates. 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.
Prior period reclassifications. Reclassifications of certain prior period amounts in the condensed consolidated financial statements have been made to conform to the current period presentation.
Recent accounting standards
Standard
 
Description
 
Date of adoption
 
Effect on the financial statements or other significant matters
Standards that were adopted
 
 
 
 
Stock Compensation 
Accounting Standards Update (ASU) No. 2016-09 (Topic 718)
 
This standard simplifies certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification on the statement of cash flows. The new guidance also allows an entity to make a policy election to account for forfeitures as they occur.
 
January 1, 2017
 
Adoption of the standard resulted in the recognition of previously unrecognized excess tax benefits using the modified retrospective method. The Company recorded an increase to U.S. deferred tax assets of $179 million which was recorded directly against accumulated deficit. The increased deferred tax asset allowed for an offset against long-term income tax payable of $16 million. A full valuation allowance was provided on the remaining U.S. deferred tax asset of $163 million, which was also recorded against accumulated deficit. The net impact to equity was a decrease in the accumulated deficit of approximately $16 million. The Company elected to apply the change in presentation to the statements of cash flows prospectively and elected to account for forfeitures as they occur.
Standards not yet adopted
 
 
 
 
Revenue from Contracts with Customers
ASU No. 2014-09, 2016-08, 2016-10 and 2016-12 (Topic 606)
 
The updated revenue standard establishes principles for recognizing revenue and develops a common revenue standard for all industries. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard requires that entities disclose the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Early adoption is permitted, but not earlier than the first quarter of 2017. The retrospective or cumulative effect transition method is permitted.
 
January 1, 2018
 
The Company completed an initial analysis of the impact of the standard on its sales contract portfolio by reviewing its current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to its sales contracts. Although the Company is continuing to review certain aspects of its policies and practices, the Company's analysis of its contracts under the new standard supports the recognition of its product revenue at the time product is shipped, consistent with its current revenue policy. The Company expects that, as a result of the adoption of the new guidance, certain sales incentives will need to be estimated as variable consideration at the time product is shipped and included as a reduction to the transaction price. This will result in a reduction of revenue being recorded earlier than under the existing guidance. The Company recognized approximately $30 and $42 million as a reduction to revenue for such sales incentives for the first nine months of 2017 and for the full year 2016, respectively. The Company does not expect that the adoption of ASU 2014-09 will have a material impact to the quarterly or yearly revenue recognized.  The Company expects to utilize the modified retrospective transition method.


Leases
ASU No. 2016-02(Topic 842)
 
This standard requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. Lessees would recognize a right-to-use asset and lease liability for all leases with terms of more than 12 months. The new standard should be applied on a modified retrospective basis.
 
January 1, 2019
 
Although the Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements and related disclosures, the Company currently expects that most of its operating lease commitments will be subject to the new standard and recognized as operating lease liabilities and right-of-use assets upon adoption.

Income Taxes
ASU No. 2016-16 (Topic 740)
 
This standard requires entities to recognize the income tax consequences of intra-entity asset transfers when they occur. This removes the exception to postpone recognition until the asset has been sold to an outside party. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted during the first interim period of a fiscal year.

 
January 1, 2018
 
The Company completed an initial analysis of the impact of the new standard and intends to apply the modified retrospective approach upon adoption. The Company will continue to evaluate the impact of the new standard but does expect that the adoption of ASU 2016-16 on January 1, 2018 will result in a $10-15 million cumulative-effect increase in accumulated deficit on its consolidated financial statements and related disclosures.


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 will be 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. Early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017, and requires a prospective transition method.

 
January 1, 2020
 
The Company does not expect that the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures.
Stock Compensation 
ASU No. 2017-09 (Topic 718)

 
This standard clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under this standard, modification is required only if the fair value, the vesting conditions, or the classification of an award as equity or liability changes as a result of the change in terms or conditions. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted.

 
January 1, 2018
 
The Company is evaluating the impact that the adoption of this standard will have on its 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 additional accounting pronouncements has had or will have a material impact on its financial statements.
Fair value measurements
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:
 
September 30, 2017
 
December 31, 2016
(in thousands)
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Cash equivalents (1):
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
45,954

 
$
—

 
$
45,954

 
$
18,024

 
$
—

 
$
18,024

Commercial paper
9,991

 
—

 
9,991

 
—

 
—

 
—

Corporate debt securities
—

 
4,500

 
4,500

 
—

 
—

 
—

Total cash equivalents
$
55,945

 
$
4,500

 
$
60,445

 
$
18,024

 
$
—

 
$
18,024

Marketable securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
$
—

 
$
—

 
$
—

 
$
—

 
$
8,283

 
$
8,283

Commercial paper
17,428

 
—

 
17,428

 
—

 
—

 
—

Corporate debt securities
—

 
14,518

 
14,518

 
—

 
15,226

 
15,226

Municipal securities
—

 
—

 
—

 
—

 
2,330

 
2,330

Total marketable securities
$
17,428

 
$
14,518

 
$
31,946

 
$
—

 
$
25,839

 
$
25,839

(1) Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets. Cash balances were $104.2 million and $174.1 million as of September 30, 2017 and December 31, 2016, respectively.

There were no transfers of financial assets between levels for the periods presented.
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. There were no transfers of financial assets between levels during the nine months ended September 30, 2017. The contractual maturities of available-for-sale marketable securities as of September 30, 2017 and December 31. 2016 were all less than one year in duration. At September 30, 2017 and December 31, 2016, 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 September 30, 2017 and December 31, 2016, the amortized cost of the Company's cash equivalents and marketable securities approximated their fair value and there were no material unrealized gains or losses, either individually or in the aggregate.
The Company's liabilities that are disclosed but not measured at fair value include the Convertible Senior Notes (see Note 4, "Financing Arrangements") which are reflected on the unaudited condensed consolidated balance sheet at cost. The fair value measurement is classified as Level 2 within the fair value hierarchy since it is based on quoted market prices of the Company's instruments in markets that are not active. 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 upfront cash payment used in the calculations of fair value on September 30, 2017, excluding any issuance costs, is the amount that a market participant would be willing to lend at September 30, 2017 to an entity with a credit rating similar to the Company and achieve sufficient cash inflows to cover the scheduled cash outflows. The calculated fair value of the Notes, of $215.8 million, is highly correlated to the Company's stock price and as a result significant changes to 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 liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances.
Condensed consolidated financial statement details Condensed consolidated financial statement details
Consolidated financial statement details
Condensed consolidated financial statement details
The following sections and tables provide details of selected balance sheet items.
Inventory
(in thousands)
September 30,
2017
 
December 31, 2016
Components
$
25,997

 
$
25,236

Finished goods
151,193

 
141,956

Total inventory
$
177,190

 
$
167,192


Property and equipment, net
(in thousands)
September 30,
2017
 
December 31, 2016
Leasehold improvements
$
67,611

 
$
48,103

Production, engineering and other equipment
47,221

 
46,328

Tooling
24,865

 
23,742

Computers and software
20,834

 
18,750

Furniture and office equipment
14,602

 
12,530

Tradeshow equipment and other
7,549

 
7,578

Construction in progress
284

 
1,870

Gross property and equipment
182,966

 
158,901

Less: Accumulated depreciation and amortization
(108,770
)
 
(82,392
)
Property and equipment, net
$
74,196

 
$
76,509


Intangible assets
 
September 30, 2017
(in thousands)
Gross carrying value
 
Accumulated
amortization
 
Net carrying value
Purchased technology
$
49,901

 
$
(23,656
)
 
$
26,245

In-process research and development (IPR&D)
615

 
—

 
615

Total intangible assets
$
50,516

 
$
(23,656
)
 
$
26,860


 
December 31, 2016
(in thousands)
Gross carrying value
 
Accumulated
amortization
 
Net carrying value
Purchased technology
$
47,001

 
$
(17,086
)
 
$
29,915

IPR&D
3,615

 
—

 
3,615

Total intangible assets
$
50,616

 
$
(17,086
)
 
$
33,530


As of September 30, 2017, technological feasibility has not been established for the remaining IPR&D assets, which have no alternative future use and, as such, continue to be accounted for as indefinite-lived intangible assets.
Amortization expense was $6.7 million and $6.5 million in the nine months ended September 30, 2017 and 2016, respectively. At September 30, 2017, expected amortization expense of intangible assets with definite lives for future periods is as follows:
(in thousands)
Total
Year ending December 31,
 
2017 (remaining 3 months)
$
2,361

2018
9,263

2019
8,753

2020
4,998

2021
870

 
$
26,245


Accrued liabilities
(in thousands)
September 30,
2017
 
December 31, 2016
Accrued payables
$
38,504

 
$
91,655

Employee related liabilities (1)
25,503

 
42,577

Accrued sales incentives
23,712

 
40,070

Warranty liability
9,303

 
11,456

Customer deposits
2,735

 
4,381

Income taxes payable
7,477

 
2,756

Purchase order commitments
2,774

 
4,730

Inventory received
25,669

 
3,950

Other
13,718

 
9,748

Accrued liabilities
$
149,395

 
$
211,323


(1) 
See Note 11 for amounts associated with restructuring liabilities.
Financing Arrangements
Financing Arrangements
Financing Arrangements
Credit Facility
In March 2016, the Company entered into a Credit Agreement (Credit Agreement) with JPMorgan Chase Bank, N.A., as administrative agent, Wells Fargo, as co-agent, and the lender parties thereto. The Credit Agreement provides for a secured revolving credit facility (Credit Facility) under which the Company may borrow up to an aggregate of $250 million and the Company and lenders may increase the total commitments under the Credit Facility to up to $300 million, subject to certain conditions. The Credit Facility will terminate and all outstanding borrowings become due and payable in March 2021.
The amount that may be borrowed under the Credit Facility is determined at periodic intervals and is based upon a borrowing base formula with respect to the Company’s inventory and accounts receivable balances. For additional information regarding the credit facility, please refer to the audited financial statements contained in our Annual Report.
At September 30, 2017 and December 31, 2016, the Company could borrow up to approximately $110 million and $150 million, respectively, under the Credit Facility and was in compliance with all financial covenants contained in the Credit Agreement. No borrowings have been made from the Credit Facility to date.
Convertible Notes
On April 12, 2017, the Company issued $175.0 million aggregate principal amount of 3.50% Convertible Senior Notes due 2022 (Notes) in a private offering to qualified institutional buyers, pursuant to Rule 144A under the Securities Act of 1933, as amended (Securities Act). The Notes were issued pursuant to an Indenture, dated as of April 12, 2017, between the Company and Wells Fargo Bank, National Association, as trustee (Wells Fargo). The Notes are senior, unsecured obligations of GoPro. The Notes mature on April 15, 2022 (Maturity Date), unless earlier repurchased or converted into shares of Class A common stock under certain circumstances described below. The Notes are convertible into cash, shares of the Company’s Class A common stock, or a combination thereof, at the Company’s election, at an initial conversion rate of 94.0071 shares of Class A common stock per $1,000 principal amount of the Notes, which is equivalent to an initial conversion price of approximately $10.64 per share of common stock, subject to adjustment. The Company currently intends to deliver cash up to the principal amount of the Notes then outstanding upon conversion. The Company will pay interest on the Notes semi-annually in arrears on April 15 and October 15 of each year with interest payments beginning on October 15, 2017.
The $175.0 million of proceeds received from the issuance of the Notes were allocated between long-term debt (the liability component) of $128.3 million and additional paid-in-capital (the equity component) of $46.7 million on the condensed consolidated balance sheet. The fair value of the liability component was measured using rates determined for similar debt instruments without a conversion feature. The carrying amount of the equity component, representing the conversion option, was determined by deducting the fair value of the liability component from the aggregate face value of the Notes. The liability component will be accreted up to the face value of the Notes of $175.0 million, which will result in additional non-cash interest expense being recognized in the condensed consolidated statements of operations through the Notes' Maturity Date. The effective interest rate on the Notes, including accretion of the notes to par and debt issuance cost amortization, was approximately 10.5%. The equity component will not be remeasured as long as it continues to meet the conditions for equity classification.
The Company incurred approximately $5.7 million of issuance costs related to the issuance of the Notes, of which $4.2 million and $1.5 million were recorded to long-term debt and additional paid-in capital, respectively, in proportion to the allocation of the proceeds of the Notes. The $4.2 million of issuance costs recorded as long-term debt on the condensed consolidated balance sheet are being amortized ratably over the five-year contractual term of the Notes.
The Company may not redeem the Notes prior to the Maturity Date and no sinking fund is provided for the Notes. The Indenture includes customary terms and covenants, including certain events of default after which the Notes may be due and payable immediately.
Holders may convert the Notes, at their option, in multiples of $1,000 principal amount at any time prior to January 15, 2022, but only in the following circumstances:

•
during any calendar quarter beginning after the calendar quarter ending on September 30, 2017, if the last reported sale price of Class A common stock for at least 20 trading days (whether or not consecutive) during the last 30 consecutive trading days of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the Notes on each applicable trading day;
•
during the five-business day period following any five consecutive trading day period in which the trading price for the Notes is less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate for the Notes on each such trading day; or
•
upon the occurrence of specified corporate events.
Regardless of whether any of the foregoing circumstances occurs, a holder may convert its Notes, in multiples of $1,000 principal amount, at any time on or after January 15, 2022 until the second scheduled trading day immediately preceding the Maturity Date of the Notes on April 22, 2022. Holders of the Notes who convert their Notes in connection with a make-whole fundamental change (as defined in the Indenture) are, under certain circumstances, entitled to an increase in the conversion rate. In addition, in the event of a fundamental change prior to the Maturity Date, holders will, subject to certain conditions, have the right, at their option, to require the Company to repurchase for cash all or part of the Notes at a repurchase price equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the repurchase date.
As of September 30, 2017, the outstanding principal on the Notes was $175.0 million, the unamortized debt discount was $43.4 million, the unamortized debt issuance cost was $3.8 million and the net carrying amount of the liability component was $127.9 million, which was recorded as long-term debt within the condensed consolidated balance sheet. For the third quarter and first nine months of 2017, the Company recorded interest expense of $1.5 million and $2.8 million, respectively, for contractual coupon interest, $0.2 million and $0.4 million, respectively, for amortization of debt issuance costs and $1.8 million and $3.4 million, respectively, for amortization of the debt discount.
In connection with the offering, the Company entered into a prepaid forward stock repurchase transaction (Prepaid Forward) with a financial institution (Forward Counterparty). Pursuant to the Prepaid Forward, the Company used approximately $78.0 million of the net proceeds from the offering of the Notes to fund the Prepaid Forward. The aggregate number of shares of the Company’s Class A common stock underlying the Prepaid Forward was approximately 9.2 million. The expiration date for the Prepaid Forward is April 15, 2022, although it may be settled earlier in whole or in part. Upon settlement of the Prepaid Forward, at expiration or upon any early settlement, the Forward Counterparty will deliver to the Company the number of shares of Class A common stock underlying the Prepaid Forward or the portion thereof being settled early. The shares purchased under the Prepaid Forward are treated as treasury stock on the consolidated balance sheet (and not outstanding for purposes of the calculation of basic and diluted earnings per share), but will remain outstanding for corporate law purposes, including for purposes of any future stockholders' votes, until the Forward Counterparty delivers the shares underlying the Prepaid Forward to the Company. The Company’s Prepaid Forward hedge transaction exposes the Company to credit risk to the extent that its counterparty may be unable to meet the terms of the transaction. The Company mitigates this risk by limiting its counterparty to a major financial institution.
Employee benefit plans
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 10 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. 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, please refer to the audited financial statements contained in its 2016 Annual Report.
Stock options
A summary of the Company’s stock option activity for the nine months ended September 30, 2017 is as follows:
 
Options outstanding
 
Shares (in thousands)
 
Weighted- average
exercise price
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2016:
12,379

 
$
12.17

 
$
32,772

Granted
1,773

 
9.31

 
 
Exercised
(1,296
)
 
1.64

 
 
Forfeited/Cancelled
(2,910
)
 
18.19

 
 
Outstanding at September 30, 2017:
9,946

 
11.28

 
33,525

 
 
 
 
 
 
Exercisable at September 30, 2017
8,069

 
$
11.01

 
$
31,378


The aggregate intrinsic value of the stock options outstanding as of September 30, 2017 represents the value of the Company's closing stock price on September 30, 2017 in excess of the exercise price multiplied by the number of options outstanding.
Restricted stock units
A summary of RSU activity for the nine months ended September 30, 2017 is as follows:
 
Shares (in thousands)
 
Weighted- average grant date fair value
Non-vested shares at December 31, 2016:
7,970

 
$
18.08

Granted
5,763

 
9.45

Vested
(3,558
)
 
14.43

Forfeited
(3,103
)
 
16.93

Non-vested shares at September 30, 2017:
7,072

 
$
13.38


In June 2014, the Company granted an award of 4.5 million RSUs covering shares of the Company's Class B common stock to the Company's CEO (CEO RSUs), which included 1.5 million RSUs that vested immediately upon grant and 3.0 million RSUs that were subject to both a market-based vesting condition and a three-year service-based vesting condition. The market-based condition was achieved in January 2015. Stock-based compensation expense related to the CEO RSUs was $0.6 million and $5.5 million for the nine months ended September 30, 2017 and 2016, respectively.
Employee stock purchase plan. For the nine months ended September 30, 2017 and 2016, the Company issued 934,359 and 668,107 shares under its ESPP at weighted average prices of $8.02 and $9.15, 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 is 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 2016 Annual Report.
The following table summarizes stock-based compensation included in the condensed consolidated statements of operations:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Cost of revenue
$
445

 
$
426

 
$
1,355

 
$
1,195

Research and development
5,967

 
8,039

 
17,039

 
21,135

Sales and marketing
2,609

 
3,816

 
7,295

 
10,699

General and administrative
2,854

 
6,185

 
10,546

 
18,572

Total stock-based compensation expense
$
11,875

 
$
18,466

 
$
36,235

 
$
51,601

The income tax benefit related to stock-based compensation expense was zero and $15.7 million for the nine months ended September 30, 2017 and 2016, respectively. There was no income tax benefit in the nine months ended September 30, 2017 due to a full valuation allowance on the Company's U.S. net deferred tax assets (see Note 7 below).
At September 30, 2017, total unearned stock-based compensation of $90.2 million related to stock options, RSUs and ESPP shares is expected to be recognized over a weighted average period of 2.1 years.
Net loss per share
Net loss per share
Net income (loss) per share
Basic net income per share is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net income per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding, including all potentially dilutive common shares.
On April 12, 2017, the Company issued $175.0 million of 3.50% Convertible Senior Notes. The 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", above. The Notes are convertible into cash, shares of the Company’s Class A common stock, or a combination thereof, at the Company’s election. As the Company currently intends to deliver cash up to the principal amount of the Notes subject to conversion, no shares associated with the Note conversion were included in the Company’s weighted-average number of common shares outstanding for any periods presented. While the Company's intent is to settle any conversion in cash, 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 as of September 30, 2017 excludes approximately 9.2 million effectively repurchased and held in treasury stock on the condensed consolidated balance sheet as a result of the Prepaid Forward transactions 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 income (loss) per share of Class A common stock assumes the conversion of Class B common stock.
The following table presents the calculations of basic and diluted net income (loss) per share:
 
Three months ended
 
Nine months ended
(in thousands, except per share data)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
14,661

 
$
(104,068
)
 
$
(127,025
)
 
$
(303,294
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares—basic for Class A and Class B common stock
136,236

 
140,124

 
138,450

 
138,875

Effect of dilutive stock-based awards
4,052

 
—

 
—

 
—

Weighted-average common shares—diluted for Class A and Class B common stock
140,288

 
140,124

 
138,450

 
138,875

 
 
 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.11

 
$
(0.74
)
 
$
(0.92
)
 
$
(2.18
)
Diluted
$
0.10

 
$
(0.74
)
 
$
(0.92
)
 
$
(2.18
)

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
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Effect of anti-dilutive stock-based awards
10,573

 
22,693

 
10,837

 
20,803

Income taxes
Income taxes
Income taxes
The Company’s income tax expense and the resulting effective tax rate are based upon the estimated annual effective tax rates applicable for the respective period, including losses generated in countries where the Company is projecting annual losses for which a deferred tax asset is not anticipated to be recognized. In the fourth quarter of 2016, the Company recorded a full valuation allowance against its net U.S. deferred tax assets, and for the foreseeable future anticipates providing a valuation allowance against any additional deferred tax assets until such time it is more likely than not the benefit of these deferred tax assets may be recognized.
The Company's tax provision and the resulting effective tax rate for interim periods is determined based upon its estimated annual effective tax rate, adjusted for the effect of discrete items arising in that quarter. The Company also includes jurisdictions with a projected loss for the year (or year-to-date loss) where the Company cannot or does not expect to recognize a tax benefit from its estimated annual effective tax rate. The impact of such inclusions could result in a higher or lower effective tax rate during a particular quarter, based upon the mix and timing of actual earnings or losses versus annual projections. The Company updates its estimate of the annual effective tax rate each quarter, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter.
 
Three months ended
 
Nine months ended
(dollars in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Income tax expense (benefit)
$
(10,844
)
 
$
(12,329
)
 
$
13,429

 
$
(43,562
)
Effective tax rate
(284.1
)%
 
10.6
%
 
(11.8
)%
 
12.6
%

The Company recorded an income tax benefit of $10.8 million for the three months ended September 30, 2017 on pre-tax net income of $3.8 million, which resulted in a negative effective tax rate of 284.1%. The Company recorded an income tax provision of $13.4 million for the nine months ended September 30, 2017 on a pre-tax net loss of $113.6 million, which resulted in a negative effective tax rate of 11.8%. The Company’s income tax provision for the nine months ended September 30, 2017 was principally composed of tax expense incurred on pre-tax income in profitable foreign jurisdictions based on the Company's estimated annual tax rate. The Company’s income tax benefit for the three months ended September 30, 2017 related primarily to foreign taxes and a cumulative adjustment due to the change in the Company's estimated annual tax rate. While the Company incurred pre-tax losses in the United States and certain lower-rate jurisdictions, the Company does not expect to recognize any tax benefits on pre-tax losses in the United States due to a full valuation allowance recorded against its U.S. deferred tax assets. The effective tax rate of 10.6% and 12.6% for the three and nine months ended September 30, 2016 resulted from the Company providing a net tax benefit on pre-tax losses in the United States, which was offset by income taxes at lower rates in profitable foreign jurisdictions (primarily related to the Company's wholly owned subsidiaries in Europe). Future changes in the forecast annual income (loss) projections, tax rate changes, or discrete tax items could result in significant adjustments to quarterly income tax expense (benefit) in future periods.
The Company is currently under examination by the Internal Revenue Service (IRS) for the 2012 through 2015 tax years. IRS audit fieldwork has been completed however due to the claimed income tax refund relating to the carryback of 2014 and 2015 net operating losses, the case will be submitted to the Congressional Joint Committee on Taxation for approval, which may take 12 months to approve after submission. The Company believes that it has made adequate tax payments or accrued adequate amounts for our tax liabilities for these years and that the outcome of the audit will not have a material adverse effect to the Company's consolidated operating results or financial position.
At September 30, 2017 and December 31, 2016, the Company’s gross unrecognized tax benefits were $70.3 million and $56.9 million, respectively. If recognized, $16.3 million of these unrecognized tax benefits (net of U.S. federal benefit) at September 30, 2017 would be recorded as a reduction of the future income tax provision. These unrecognized tax benefits relate primarily to unresolved matters with taxing authorities regarding the Company’s transfer pricing positions and tax positions based on the Company’s interpretation of certain U.S. trial and appellate court decisions, which remain subject to appeal and therefore could be overturned in future periods. The Company’s existing tax positions will continue to generate an increase in unrecognized tax benefits in subsequent periods. Management believes events that could occur in the next 12 months and cause a material change in unrecognized tax benefits include, but are not limited to, the completion of examinations by the U.S. or foreign taxing authorities and the expiration of statute of limitations on the Company's tax returns. Although the completion, settlement and closure of any audit is uncertain, it is reasonably possible that the total amount of unrecognized tax benefits will not materially increase within the next 12 months.
Related party transactions
Related party transactions
Related party transactions
The Company incurs costs for Company-related chartered aircraft fees for the use of the CEO’s private plane. The Company recorded expense of $31 thousand and $68 thousand in the three months ended September 30, 2017 and 2016, respectively, while recording $66 thousand and $670 thousand in the nine months ended September 30, 2017 and 2016, respectively. As of September 30, 2017 and December 31, 2016, the Company had no accounts payable associated with these aircraft fees.
See Note 5 above for information regarding CEO RSUs.
Commitments, contingencies and guarantees
Commitments, contingencies and guarantees
Commitments, contingencies and guarantees
Facility Leases. The Company leases its facilities under long-term operating leases, which expire at various dates through 2027. As of December 31, 2016, the Company’s total future minimum lease payments under non-cancelable operating leases were $139.5 million. There have been no material changes to the Company's lease commitments. Rent expense was $4.6 million for both the three months ended September 30, 2017 and 2016 while rent expense for the nine months ended September 30, 2017 and 2016 was $14.6 million and $14.4 million, respectively.
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 and various other contractual commitments. As of September 30, 2017, the Company's total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $11.8 million, composed of payments of $2.9 million to be made during the remaining three months of 2017, and $5.4 million and $3.5 million in 2018 and 2019, respectively. The decrease of $41.9 million from future expected obligations of $53.7 million at December 31, 2016 was primarily due to the termination of a 3.5-year agreement the Company entered into with Red Bull GmbH in May 2016 and the termination of a contract with a software technology development vendor that resulted in a reduction to the Company's future expected obligations. There were no other material changes during the first nine months of 2017.
Product warranty
The following table summarizes the warranty liability activity:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Beginning balances
$
9,974

 
$
8,939

 
$
11,944

 
$
10,855

Charged to cost of revenue
5,986

 
4,485

 
13,394

 
13,026

Settlements of warranty claims
(6,273
)
 
(4,068
)
 
(15,651
)
 
(14,525
)
Ending balances
$
9,687

 
$
9,356

 
$
9,687

 
$
9,356


Legal proceedings. From time to time, the Company is involved in legal proceedings in the ordinary course of business, including the litigation matters described in Part II, Item 1 of this Quarterly Report on Form 10-Q. Due to inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of these matters. The Company is unable at this time to determine whether the outcome of the litigation would have a material impact on the results of operations, financial condition or cash flows of the Company.
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 September 30, 2017, 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.
Concentrations of risk and geographic information
Concentrations of risk and segment information
Concentrations of risk and geographic information
Customer concentration. Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables. The Company believes that credit risk for accounts receivable is mitigated by the Company's credit evaluation process, relatively short collection terms and dispersion of its customer base. The Company generally does not require collateral and losses on trade receivables have historically been within management’s expectations.
Customers who represented 10% or more of the Company's net accounts receivable balance were as follows:
 
September 30,
2017
 
December 31, 2016
Customer A
13%
 
15%
Customer B
20%
 
27%

The following table summarizes the Company's accounts receivables sold, without recourse, and factoring fees paid:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Accounts receivable sold
$
51,593

 
$
35,210

 
$
130,555

 
$
99,514

Factoring fees
473

 
267

 
1,153

 
726


Customers who represented 10% or more of the Company's total revenue were as follows:
 
Three months ended
 
Nine months ended
 
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Customer A
16%
 
21%
 
16%
 
19%
Customer B
*
 
10%
 
*
 
12%
* Less than 10% of total revenue for the period indicated
Supplier concentration. The Company relies on third parties for the supply and manufacture of its products, some of which are sole-source suppliers. The Company believes that outsourcing manufacturing enables greater scale and flexibility. As demand and product lines change, the Company periodically evaluates the need and advisability of adding manufacturers to support its operations. In instances where a supply and manufacture agreement does not exist or suppliers fail to perform their obligations, the Company may be unable to find alternative suppliers or satisfactorily deliver its products to its customers on time, if at all. The Company also relies on third parties with whom it outsources supply chain activities related to inventory warehousing, order fulfillment, distribution and other direct sales logistics.
Geographic information
Revenue by geographic region, based on ship-to destinations, was as follows:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Americas
$
163,430

 
$
135,895

 
$
416,164

 
$
345,770

Europe, Middle East and Africa (EMEA)
97,179

 
77,346

 
245,256

 
198,338

Asia and Pacific (APAC)
69,196

 
27,328

 
183,525

 
100,752

Total revenue
$
329,805

 
$
240,569

 
$
844,945

 
$
644,860


Revenue in the United States, which is included in the Americas geographic region, was $375.9 million and $310.7 million for the nine months ended September 30, 2017 and 2016, respectively. No other individual country exceeded 10% of total revenue for any period presented. The Company does not disclose revenue by product category as it does not track sales incentives and other revenue adjustments by product category to report such data.
As of September 30, 2017 and December 31, 2016, long-lived assets, which represent gross property and equipment, located outside the United States, primarily in Hong Kong and China, were $79.9 million and $76.6 million, respectively.
Restructuring charges
Restructuring charges
Restructuring charges
Restructuring charges for each period were as follows:
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
Cost of revenue
$
458

 
$
364

Research and development
8,406

 
2,655

Sales and marketing
5,960

 
2,678

General and administrative
1,964

 
811

Total restructuring charges
$
16,788

 
$
6,508


First quarter 2017 restructuring
On March 15, 2017, the Company approved a restructuring to further reduce future operating expenses and better align resources around its long-term business strategy. The restructuring provided for a reduction of employee headcount and open positions, eliminating a total of approximately 270 positions, as well as the consolidation of certain leased office facilities. In the first nine months of 2017, the Company recorded restructuring charges of $13.6 million, including $10.4 million related to severance and $3.2 million related to accelerated depreciation and other charges. The actions associated with the first quarter 2017 restructuring are expected to be substantially completed in the fourth quarter of 2017. While the Company anticipates that any additional charges related to this restructuring will be immaterial, actual results may differ from current estimates as it relates to the consolidation of certain leased office facilities.
The following table provides a summary of the Company's restructuring activities for the first nine months of 2017 and the related liabilities recorded in accrued liabilities on the condensed consolidated balance sheet.
(in thousands)
Severance
 
Other
 
Total
Restructuring liability as of December 31, 2016
$
—

 
$
—

 
$
—

Restructuring charges
10,435

 
3,171

 
13,606

Cash paid
(9,103
)
 
(71
)
 
(9,174
)
Non-cash reductions
(803
)
 
(2,925
)
 
(3,728
)
Restructuring liability as of September 30, 2017
$
529

 
$
175

 
$
704


Fourth quarter 2016 restructuring
On November 29, 2016, the Company approved a restructuring to reduce future operating expenses. The restructuring provided for a reduction of the Company's global workforce of approximately 15%, the closure of the Company’s entertainment group to concentrate on its core business and the consolidation of certain leased office facilities. Under the fourth quarter 2016 restructuring, the Company has recorded cumulative charges of $40.7 million, including $3.2 million related to severance, facilities contract terminations in the nine months ended September 30, 2017. The fourth quarter 2016 restructuring actions were completed by March 31, 2017, with only small incremental charges recorded through the third quarter of 2017.
The following table provides a summary of the Company's restructuring activities for the first nine months of 2017 and the related liabilities recorded in accrued liabilities on the condensed consolidated balance sheet.
(in thousands)
Severance
 
Other
 
Total
Restructuring liability as of December 31, 2016
$
9,660

 
$
879

 
$
10,539

Restructuring charges
2,127

 
1,055

 
3,182

Cash paid
(11,363
)
 
(1,884
)
 
(13,247
)
Non-cash reductions
—

 
—

 
—

Restructuring liability as of September 30, 2017
$
424

 
$
50

 
$
474


First quarter 2016 restructuring
On January 12, 2016, the Company approved a restructuring that provided for a reduction in the Company’s global workforce of approximately 7%. The Company incurred aggregate restructuring expenses of $6.5 million in the first quarter of 2016, which primarily included cash-based severance costs. The plan was completed as of March 31, 2016 and all costs have been paid. No charges were recorded in periods after March 31, 2016.
Summary of business and significant accounting policies (Policies)
Basis of presentation 
Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. 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 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, 2016 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, 2016. There have been no significant changes in the Company’s accounting policies 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 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 returns, implied post contract support and marketing allowances), stock-based compensation, inventory valuation, product warranty liabilities, the valuation and useful lives of long-lived assets (property and equipment, intangible assets and goodwill) and income taxes. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, 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. Actual results could differ materially from management's estimates. 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
Prior period reclassifications 
Prior period reclassifications. Reclassifications of certain prior period amounts in the condensed consolidated financial statements have been made to conform to the current period presentation.
Recent accounting pronouncements 
Recent accounting standards
Standard
 
Description
 
Date of adoption
 
Effect on the financial statements or other significant matters
Standards that were adopted
 
 
 
 
Stock Compensation 
Accounting Standards Update (ASU) No. 2016-09 (Topic 718)
 
This standard simplifies certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification on the statement of cash flows. The new guidance also allows an entity to make a policy election to account for forfeitures as they occur.
 
January 1, 2017
 
Adoption of the standard resulted in the recognition of previously unrecognized excess tax benefits using the modified retrospective method. The Company recorded an increase to U.S. deferred tax assets of $179 million which was recorded directly against accumulated deficit. The increased deferred tax asset allowed for an offset against long-term income tax payable of $16 million. A full valuation allowance was provided on the remaining U.S. deferred tax asset of $163 million, which was also recorded against accumulated deficit. The net impact to equity was a decrease in the accumulated deficit of approximately $16 million. The Company elected to apply the change in presentation to the statements of cash flows prospectively and elected to account for forfeitures as they occur.
Standards not yet adopted
 
 
 
 
Revenue from Contracts with Customers
ASU No. 2014-09, 2016-08, 2016-10 and 2016-12 (Topic 606)
 
The updated revenue standard establishes principles for recognizing revenue and develops a common revenue standard for all industries. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard requires that entities disclose the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Early adoption is permitted, but not earlier than the first quarter of 2017. The retrospective or cumulative effect transition method is permitted.
 
January 1, 2018
 
The Company completed an initial analysis of the impact of the standard on its sales contract portfolio by reviewing its current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to its sales contracts. Although the Company is continuing to review certain aspects of its policies and practices, the Company's analysis of its contracts under the new standard supports the recognition of its product revenue at the time product is shipped, consistent with its current revenue policy. The Company expects that, as a result of the adoption of the new guidance, certain sales incentives will need to be estimated as variable consideration at the time product is shipped and included as a reduction to the transaction price. This will result in a reduction of revenue being recorded earlier than under the existing guidance. The Company recognized approximately $30 and $42 million as a reduction to revenue for such sales incentives for the first nine months of 2017 and for the full year 2016, respectively. The Company does not expect that the adoption of ASU 2014-09 will have a material impact to the quarterly or yearly revenue recognized.  The Company expects to utilize the modified retrospective transition method.


Leases
ASU No. 2016-02(Topic 842)
 
This standard requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. Lessees would recognize a right-to-use asset and lease liability for all leases with terms of more than 12 months. The new standard should be applied on a modified retrospective basis.
 
January 1, 2019
 
Although the Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements and related disclosures, the Company currently expects that most of its operating lease commitments will be subject to the new standard and recognized as operating lease liabilities and right-of-use assets upon adoption.

Income Taxes
ASU No. 2016-16 (Topic 740)
 
This standard requires entities to recognize the income tax consequences of intra-entity asset transfers when they occur. This removes the exception to postpone recognition until the asset has been sold to an outside party. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted during the first interim period of a fiscal year.

 
January 1, 2018
 
The Company completed an initial analysis of the impact of the new standard and intends to apply the modified retrospective approach upon adoption. The Company will continue to evaluate the impact of the new standard but does expect that the adoption of ASU 2016-16 on January 1, 2018 will result in a $10-15 million cumulative-effect increase in accumulated deficit on its consolidated financial statements and related disclosures.


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 will be 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. Early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017, and requires a prospective transition method.

 
January 1, 2020
 
The Company does not expect that the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures.
Stock Compensation 
ASU No. 2017-09 (Topic 718)

 
This standard clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under this standard, modification is required only if the fair value, the vesting conditions, or the classification of an award as equity or liability changes as a result of the change in terms or conditions. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted.

 
January 1, 2018
 
The Company is evaluating the impact that the adoption of this standard will have on its consolidated financial statements and related disclosures.
Summary of business and significant accounting policies (Tables)
Schedule of recent accounting pronouncements
Recent accounting standards
Standard
 
Description
 
Date of adoption
 
Effect on the financial statements or other significant matters
Standards that were adopted
 
 
 
 
Stock Compensation 
Accounting Standards Update (ASU) No. 2016-09 (Topic 718)
 
This standard simplifies certain aspects of the accounting for share-based payment transactions, including income taxes, classification of awards and classification on the statement of cash flows. The new guidance also allows an entity to make a policy election to account for forfeitures as they occur.
 
January 1, 2017
 
Adoption of the standard resulted in the recognition of previously unrecognized excess tax benefits using the modified retrospective method. The Company recorded an increase to U.S. deferred tax assets of $179 million which was recorded directly against accumulated deficit. The increased deferred tax asset allowed for an offset against long-term income tax payable of $16 million. A full valuation allowance was provided on the remaining U.S. deferred tax asset of $163 million, which was also recorded against accumulated deficit. The net impact to equity was a decrease in the accumulated deficit of approximately $16 million. The Company elected to apply the change in presentation to the statements of cash flows prospectively and elected to account for forfeitures as they occur.
Standards not yet adopted
 
 
 
 
Revenue from Contracts with Customers
ASU No. 2014-09, 2016-08, 2016-10 and 2016-12 (Topic 606)
 
The updated revenue standard establishes principles for recognizing revenue and develops a common revenue standard for all industries. Under the new model, recognition of revenue occurs when a customer obtains control of promised goods or services in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new standard requires that entities disclose the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Early adoption is permitted, but not earlier than the first quarter of 2017. The retrospective or cumulative effect transition method is permitted.
 
January 1, 2018
 
The Company completed an initial analysis of the impact of the standard on its sales contract portfolio by reviewing its current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to its sales contracts. Although the Company is continuing to review certain aspects of its policies and practices, the Company's analysis of its contracts under the new standard supports the recognition of its product revenue at the time product is shipped, consistent with its current revenue policy. The Company expects that, as a result of the adoption of the new guidance, certain sales incentives will need to be estimated as variable consideration at the time product is shipped and included as a reduction to the transaction price. This will result in a reduction of revenue being recorded earlier than under the existing guidance. The Company recognized approximately $30 and $42 million as a reduction to revenue for such sales incentives for the first nine months of 2017 and for the full year 2016, respectively. The Company does not expect that the adoption of ASU 2014-09 will have a material impact to the quarterly or yearly revenue recognized.  The Company expects to utilize the modified retrospective transition method.


Leases
ASU No. 2016-02(Topic 842)
 
This standard requires lessees to put most leases on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. Lessees would recognize a right-to-use asset and lease liability for all leases with terms of more than 12 months. The new standard should be applied on a modified retrospective basis.
 
January 1, 2019
 
Although the Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements and related disclosures, the Company currently expects that most of its operating lease commitments will be subject to the new standard and recognized as operating lease liabilities and right-of-use assets upon adoption.

Income Taxes
ASU No. 2016-16 (Topic 740)
 
This standard requires entities to recognize the income tax consequences of intra-entity asset transfers when they occur. This removes the exception to postpone recognition until the asset has been sold to an outside party. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted during the first interim period of a fiscal year.

 
January 1, 2018
 
The Company completed an initial analysis of the impact of the new standard and intends to apply the modified retrospective approach upon adoption. The Company will continue to evaluate the impact of the new standard but does expect that the adoption of ASU 2016-16 on January 1, 2018 will result in a $10-15 million cumulative-effect increase in accumulated deficit on its consolidated financial statements and related disclosures.


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 will be 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. Early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017, and requires a prospective transition method.

 
January 1, 2020
 
The Company does not expect that the adoption of this standard will have a material impact on its consolidated financial statements and related disclosures.
Stock Compensation 
ASU No. 2017-09 (Topic 718)

 
This standard clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. Under this standard, modification is required only if the fair value, the vesting conditions, or the classification of an award as equity or liability changes as a result of the change in terms or conditions. The updated standard is effective in annual and interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted.

 
January 1, 2018
 
The Company is evaluating the impact that the adoption of this standard will have on its consolidated financial statements and related disclosures.
Fair value measurements (Tables)
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:
 
September 30, 2017
 
December 31, 2016
(in thousands)
Level 1
 
Level 2
 
Total
 
Level 1
 
Level 2
 
Total
Cash equivalents (1):
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
45,954

 
$
—

 
$
45,954

 
$
18,024

 
$
—

 
$
18,024

Commercial paper
9,991

 
—

 
9,991

 
—

 
—

 
—

Corporate debt securities
—

 
4,500

 
4,500

 
—

 
—

 
—

Total cash equivalents
$
55,945

 
$
4,500

 
$
60,445

 
$
18,024

 
$
—

 
$
18,024

Marketable securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. agency securities
$
—

 
$
—

 
$
—

 
$
—

 
$
8,283

 
$
8,283

Commercial paper
17,428

 
—

 
17,428

 
—

 
—

 
—

Corporate debt securities
—

 
14,518

 
14,518

 
—

 
15,226

 
15,226

Municipal securities
—

 
—

 
—

 
—

 
2,330

 
2,330

Total marketable securities
$
17,428

 
$
14,518

 
$
31,946

 
$
—

 
$
25,839

 
$
25,839

(1) Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets. Cash balances were $104.2 million and $174.1 million as of September 30, 2017 and December 31, 2016, respectively.
Condensed consolidated financial statement details (Tables)
Schedule of Inventory 
Inventory
(in thousands)
September 30,
2017
 
December 31, 2016
Components
$
25,997

 
$
25,236

Finished goods
151,193

 
141,956

Total inventory
$
177,190

 
$
167,192

Property, Plant and Equipment 
Property and equipment, net
(in thousands)
September 30,
2017
 
December 31, 2016
Leasehold improvements
$
67,611

 
$
48,103

Production, engineering and other equipment
47,221

 
46,328

Tooling
24,865

 
23,742

Computers and software
20,834

 
18,750

Furniture and office equipment
14,602

 
12,530

Tradeshow equipment and other
7,549

 
7,578

Construction in progress
284

 
1,870

Gross property and equipment
182,966

 
158,901

Less: Accumulated depreciation and amortization
(108,770
)
 
(82,392
)
Property and equipment, net
$
74,196

 
$
76,509

Schedule of Finite-Lived Intangible Assets 
Intangible assets
 
September 30, 2017
(in thousands)
Gross carrying value
 
Accumulated
amortization
 
Net carrying value
Purchased technology
$
49,901

 
$
(23,656
)
 
$
26,245

In-process research and development (IPR&D)
615

 
—

 
615

Total intangible assets
$
50,516

 
$
(23,656
)
 
$
26,860


 
December 31, 2016
(in thousands)
Gross carrying value
 
Accumulated
amortization
 
Net carrying value
Purchased technology
$
47,001

 
$
(17,086
)
 
$
29,915

IPR&D
3,615

 
—

 
3,615

Total intangible assets
$
50,616

 
$
(17,086
)
 
$
33,530

Schedule of Future Amortization 
Amortization expense was $6.7 million and $6.5 million in the nine months ended September 30, 2017 and 2016, respectively. At September 30, 2017, expected amortization expense of intangible assets with definite lives for future periods is as follows:
(in thousands)
Total
Year ending December 31,
 
2017 (remaining 3 months)
$
2,361

2018
9,263

2019
8,753

2020
4,998

2021
870

 
$
26,245


Schedule of Accrued Liabilities 
Accrued liabilities
(in thousands)
September 30,
2017
 
December 31, 2016
Accrued payables
$
38,504

 
$
91,655

Employee related liabilities (1)
25,503

 
42,577

Accrued sales incentives
23,712

 
40,070

Warranty liability
9,303

 
11,456

Customer deposits
2,735

 
4,381

Income taxes payable
7,477

 
2,756

Purchase order commitments
2,774

 
4,730

Inventory received
25,669

 
3,950

Other
13,718

 
9,748

Accrued liabilities
$
149,395

 
$
211,323

Employee benefit plans (Tables)
Schedule of Share-based Compensation, Stock Options, Activity 
 
Options outstanding
 
Shares (in thousands)
 
Weighted- average
exercise price
 
Aggregate
intrinsic value
(in thousands)
Outstanding at December 31, 2016:
12,379

 
$
12.17

 
$
32,772

Granted
1,773

 
9.31

 
 
Exercised
(1,296
)
 
1.64

 
 
Forfeited/Cancelled
(2,910
)
 
18.19

 
 
Outstanding at September 30, 2017:
9,946

 
11.28

 
33,525

 
 
 
 
 
 
Exercisable at September 30, 2017
8,069

 
$
11.01

 
$
31,378

Schedule of Share-based Compensation, Restricted Stock Units Award Activity 
 
Shares (in thousands)
 
Weighted- average grant date fair value
Non-vested shares at December 31, 2016:
7,970

 
$
18.08

Granted
5,763

 
9.45

Vested
(3,558
)
 
14.43

Forfeited
(3,103
)
 
16.93

Non-vested shares at September 30, 2017:
7,072

 
$
13.38

Allocation of Stock-based Compensation Expense 
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Cost of revenue
$
445

 
$
426

 
$
1,355

 
$
1,195

Research and development
5,967

 
8,039

 
17,039

 
21,135

Sales and marketing
2,609

 
3,816

 
7,295

 
10,699

General and administrative
2,854

 
6,185

 
10,546

 
18,572

Total stock-based compensation expense
$
11,875

 
$
18,466

 
$
36,235

 
$
51,601

Net loss per share (Tables)
Schedule of Net Income per Share, Basic and Diluted 
The following table presents the calculations of basic and diluted net income (loss) per share:
 
Three months ended
 
Nine months ended
(in thousands, except per share data)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
14,661

 
$
(104,068
)
 
$
(127,025
)
 
$
(303,294
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares—basic for Class A and Class B common stock
136,236

 
140,124

 
138,450

 
138,875

Effect of dilutive stock-based awards
4,052

 
—

 
—

 
—

Weighted-average common shares—diluted for Class A and Class B common stock
140,288

 
140,124

 
138,450

 
138,875

 
 
 
 
 
 
 
 
Net income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.11

 
$
(0.74
)
 
$
(0.92
)
 
$
(2.18
)
Diluted
$
0.10

 
$
(0.74
)
 
$
(0.92
)
 
$
(2.18
)
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
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Effect of anti-dilutive stock-based awards
10,573

 
22,693

 
10,837

 
20,803

Income taxes (Tables)
Schedule of Components of Income Tax Expense (Benefit)
 
Three months ended
 
Nine months ended
(dollars in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Income tax expense (benefit)
$
(10,844
)
 
$
(12,329
)
 
$
13,429

 
$
(43,562
)
Effective tax rate
(284.1
)%
 
10.6
%
 
(11.8
)%
 
12.6
%
Commitments, contingencies and guarantees (Tables)
Other Commitments 
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 and various other contractual commitments. As of September 30, 2017, the Company's total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $11.8 million, composed of payments of $2.9 million to be made during the remaining three months of 2017, and $5.4 million and $3.5 million in 2018 and 2019, respectively. The decrease of $41.9 million from future expected obligations of $53.7 million at December 31, 2016 was primarily due to the termination of a 3.5-year agreement the Company entered into with Red Bull GmbH in May 2016 and the termination of a contract with a software technology development vendor that resulted in a reduction to the Company's future expected obligations. There were no other material changes during the first nine months of 2017.
Schedule of Product Warranty Liability Activity 
Product warranty
The following table summarizes the warranty liability activity:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Beginning balances
$
9,974

 
$
8,939

 
$
11,944

 
$
10,855

Charged to cost of revenue
5,986

 
4,485

 
13,394

 
13,026

Settlements of warranty claims
(6,273
)
 
(4,068
)
 
(15,651
)
 
(14,525
)
Ending balances
$
9,687

 
$
9,356

 
$
9,687

 
$
9,356

Concentrations of risk and geographic information (Tables)
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
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Accounts receivable sold
$
51,593

 
$
35,210

 
$
130,555

 
$
99,514

Factoring fees
473

 
267

 
1,153

 
726

Schedule of Revenue by Geographic Region 
Revenue by geographic region, based on ship-to destinations, was as follows:
 
Three months ended
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Americas
$
163,430

 
$
135,895

 
$
416,164

 
$
345,770

Europe, Middle East and Africa (EMEA)
97,179

 
77,346

 
245,256

 
198,338

Asia and Pacific (APAC)
69,196

 
27,328

 
183,525

 
100,752

Total revenue
$
329,805

 
$
240,569

 
$
844,945

 
$
644,860

Schedules of Customer Concentration by Risk Factor 
Customers who represented 10% or more of the Company's net accounts receivable balance were as follows:
 
September 30,
2017
 
December 31, 2016
Customer A
13%
 
15%
Customer B
20%
 
27%
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
 
Nine months ended
 
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Customer A
16%
 
21%
 
16%
 
19%
Customer B
*
 
10%
 
*
 
12%
* Less than 10% of total revenue for the period indicated
Restructuring charges (Tables)
Restructuring and Related Costs 
Restructuring charges for each period were as follows:
 
Nine months ended
(in thousands)
September 30,
2017
 
September 30,
2016
Cost of revenue
$
458

 
$
364

Research and development
8,406

 
2,655

Sales and marketing
5,960

 
2,678

General and administrative
1,964

 
811

Total restructuring charges
$
16,788

 
$
6,508

Schedule of Restructuring Reserve by Type of Cost 
The following table provides a summary of the Company's restructuring activities for the first nine months of 2017 and the related liabilities recorded in accrued liabilities on the condensed consolidated balance sheet.
(in thousands)
Severance
 
Other
 
Total
Restructuring liability as of December 31, 2016
$
9,660

 
$
879

 
$
10,539

Restructuring charges
2,127

 
1,055

 
3,182

Cash paid
(11,363
)
 
(1,884
)
 
(13,247
)
Non-cash reductions
—

 
—

 
—

Restructuring liability as of September 30, 2017
$
424

 
$
50

 
$
474

The following table provides a summary of the Company's restructuring activities for the first nine months of 2017 and the related liabilities recorded in accrued liabilities on the condensed consolidated balance sheet.
(in thousands)
Severance
 
Other
 
Total
Restructuring liability as of December 31, 2016
$
—

 
$
—

 
$
—

Restructuring charges
10,435

 
3,171

 
13,606

Cash paid
(9,103
)
 
(71
)
 
(9,174
)
Non-cash reductions
(803
)
 
(2,925
)
 
(3,728
)
Restructuring liability as of September 30, 2017
$
529

 
$
175

 
$
704

Summary of business and significant accounting policies (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]
 
 
Effective tax rate reconciliation, share based compensation, excess tax benefit
 
$ 179 
Accounting Standards Update 2014-09, 2016-08, 2016-10, 2016-12 [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Sales incentives
19 
42 
New Accounting Pronouncement, Early Adoption, Effect [Member] |
Accounting Standards Update 2016-09 [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Deferred tax liability
 
16 
Deferred income tax assets
 
163 
New Accounting Pronouncement, Early Adoption, Effect [Member] |
Retained Earnings [Member] |
Accounting Standards Update 2016-09 [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Cumulative effect of new accounting principle in period of adoption
 
$ 16 
(Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]
 
 
 
Cash consideration
$ 0 
$ 104,353 
 
Goodwill
$ 146,459 
 
$ 146,459 
Fair value measurements (Details) (USD $)
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash
$ 104,200,000 
$ 174,100,000 
Marketable securities
31,946,000 
25,839,000 
Level 2 [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Fair value of convertible senior notes
215,800,000 
 
Fair Value, Measurements, Recurring [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
60,445,000 
18,024,000 
Marketable securities
31,946,000 
25,839,000 
Fair Value, Measurements, Recurring [Member] |
US Agency Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
8,283,000 
Fair Value, Measurements, Recurring [Member] |
Commercial Paper [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
17,428,000 
0 
Fair Value, Measurements, Recurring [Member] |
Corporate Debt Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
14,518,000 
15,226,000 
Fair Value, Measurements, Recurring [Member] |
Municipal Notes [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
2,330,000 
Fair Value, Measurements, Recurring [Member] |
Commercial Paper [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
9,991,000 
 
Fair Value, Measurements, Recurring [Member] |
Money Market Funds [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
45,954,000 
18,024,000 
Fair Value, Measurements, Recurring [Member] |
Corporate Debt Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
4,500,000 
 
Fair Value, Measurements, Recurring [Member] |
Level 1 [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
55,945,000 
18,024,000 
Marketable securities
17,428,000 
0 
Fair Value, Measurements, Recurring [Member] |
Level 1 [Member] |
US Agency Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
0 
Fair Value, Measurements, Recurring [Member] |
Level 1 [Member] |
Commercial Paper [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
17,428,000 
0 
Fair Value, Measurements, 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, Measurements, Recurring [Member] |
Level 1 [Member] |
Municipal Notes [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
0 
Fair Value, Measurements, Recurring [Member] |
Level 1 [Member] |
Commercial Paper [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
9,991,000 
 
Fair Value, Measurements, 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
45,954,000 
18,024,000 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
4,500,000 
0 
Marketable securities
14,518,000 
25,839,000 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member] |
US Agency Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
8,283,000 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member] |
Commercial Paper [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
0 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member] |
Corporate Debt Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
14,518,000 
15,226,000 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member] |
Municipal Notes [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Marketable securities
0 
2,330,000 
Fair Value, Measurements, 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 
Fair Value, Measurements, Recurring [Member] |
Level 2 [Member] |
Corporate Debt Securities [Member]
 
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
 
 
Cash and Cash Equivalents
$ 4,500,000 
 
Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) (USD $)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
 
 
 
 
Marketable securities
$ 31,946,000 
$ 25,839,000 
 
 
Cash
104,200,000 
174,100,000 
 
 
Cash and cash equivalents
164,616,000 
192,114,000 
131,577,000 
279,672,000 
Fair Value, Measurements, Recurring [Member]
 
 
 
 
Cash and Cash Equivalents [Line Items]
 
 
 
 
Marketable securities
$ 31,946,000 
$ 25,839,000 
 
 
Condensed consolidated financial statement details - Inventory (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
 
 
Components
$ 25,997 
$ 25,236 
Finished goods
151,193 
141,956 
Total inventory
$ 177,190 
$ 167,192 
Condensed consolidated financial statement details - Property and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
$ 182,966 
$ 158,901 
Less: Accumulated depreciation and amortization
(108,770)
(82,392)
Property and equipment, net
74,196 
76,509 
Leasehold Improvements [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
67,611 
48,103 
Production, engineering and other equipment [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
47,221 
46,328 
Tooling [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
24,865 
23,742 
Computers and software [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
20,834 
18,750 
Furniture and office equipment [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
14,602 
12,530 
Tradeshow Equipment and other [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
7,549 
7,578 
Construction in Progress [Member]
 
 
Property, Plant and Equipment [Line Items]
 
 
Gross property and equipment
$ 284 
$ 1,870 
Condensed consolidated financial statement details - Intangible Assets and Goodwill (Details) (USD $)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]
 
 
 
Gross carrying value
$ 49,901,000 
 
$ 47,001,000 
Accumulated amortization
(23,656,000)
 
(17,086,000)
Net carrying value
26,245,000 
 
29,915,000 
Indefinite lived intangible assets
615,000 
 
 
Intangible Assets, Gross (Excluding Goodwill)
50,516,000 
 
50,616,000 
Intangible assets, net
26,860,000 
 
33,530,000 
Indefinite-lived Intangible Assets [Roll Forward]
 
 
 
Balance at December 31, 2016
3,615,000 
 
 
Balance at June 30, 2017
615,000 
 
 
Amortization of intangible assets
6,700,000 
6,500,000 
 
Goodwill
$ 146,459,000 
 
$ 146,459,000 
Condensed consolidated financial statement details - Future Amortization (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
 
 
2017
$ 2,361 
 
2018
9,263 
 
2019
8,753 
 
2020
4,998 
 
2021
870 
 
Net carrying value
$ 26,245 
$ 29,915 
Condensed consolidated financial statement details - Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Business Combination, Goodwill [Abstract]
 
 
Goodwill
$ 146,459 
$ 146,459 
Condensed consolidated financial statement details - Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
 
 
Accrued payables
$ 38,504 
$ 91,655 
Employee related liabilities
25,503 
42,577 
Accrued sales incentives
23,712 
40,070 
Warranty liability
9,303 
11,456 
Customer deposits
2,735 
4,381 
Income taxes payable
7,477 
2,756 
Purchase order commitments
2,774 
4,730 
Inventory received
25,669 
3,950 
Other
13,718 
9,748 
Accrued liabilities
$ 149,395 
$ 211,323 
Financing Arrangements (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
0 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Apr. 12, 2017
Sep. 30, 2017
Sep. 30, 2016
Apr. 12, 2017
Dec. 31, 2016
Sep. 30, 2017
Revolving Credit Facility [Member]
Dec. 31, 2016
Revolving Credit Facility [Member]
Mar. 31, 2016
Revolving Credit Facility [Member]
Apr. 12, 2017
Convertible Debt [Member]
Sep. 30, 2017
Convertible Debt [Member]
Sep. 30, 2017
Convertible Debt [Member]
Jun. 30, 2017
Convertible Debt [Member]
Apr. 12, 2017
Convertible Debt [Member]
Sep. 30, 2017
Long-term Debt [Member]
Convertible Debt [Member]
Sep. 30, 2017
Additional Paid-in Capital [Member]
Convertible Debt [Member]
Line of Credit Facility [Line Items]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Credit agreement, current borrowing capacity
 
 
 
 
 
 
 
$ 250,000,000 
 
 
 
 
 
 
 
Credit agreement, maximum borrowing capacity
 
 
 
 
 
 
 
300,000,000 
 
 
 
 
 
 
 
Line of Credit Facility, Remaining Borrowing Capacity
 
 
 
 
 
110,000,000 
150,000,000 
 
 
 
 
 
 
 
 
Amount outstanding
 
 
 
 
 
 
0 
 
 
 
 
 
 
 
 
Debt instrument
 
 
 
 
 
 
 
 
 
175,000,000 
175,000,000 
 
175,000,000 
 
 
Debt Instrument, Unamortized Discount
 
 
 
 
 
 
 
 
 
43,400,000 
43,400,000 
 
 
 
 
Interest rate
 
 
 
 
 
 
 
 
 
 
 
 
3.50% 
 
 
Debt Instrument, Convertible, Conversion Ratio
 
 
 
 
 
 
 
 
94.0071 
 
 
 
 
 
 
Debt Instrument, Convertible, Conversion Price
 
 
 
 
 
 
 
 
 
 
 
 
$ 10.64 
 
 
Proceeds from issuance of Convertible senior notes
 
175,000,000 
0 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible debt, equity portion
 
128,300,000 
 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible debt, long-term debt portion
 
46,700,000 
 
 
 
 
 
 
 
 
 
 
 
 
 
Effective rate
 
 
 
 
 
 
 
 
 
10.50% 
10.50% 
 
 
 
 
Debt Issuance Costs, Gross
 
 
 
 
 
 
 
 
 
 
 
 
 
4,200,000 
1,500,000 
Debt Issuance Costs, Net
 
 
 
 
 
 
 
 
 
5,700,000 
5,700,000 
 
 
3,800,000 
 
Percentage of conversion price of notes
 
 
 
 
 
 
 
 
 
 
 
130.00% 
 
 
 
Percentage of trading price of notes
 
 
 
 
 
 
 
 
 
 
 
98.00% 
 
 
 
Long-term Debt
 
127,861,000 
 
 
0 
 
 
 
 
127,900,000 
127,900,000 
 
 
 
 
Interest Expense, Debt
 
 
 
 
 
 
 
 
 
1,500,000 
2,800,000 
 
 
 
 
Amortization of Debt Issuance Costs
 
 
 
 
 
 
 
 
 
200,000 
400,000 
 
 
 
 
Amortization of Debt Discount (Premium)
 
 
 
 
 
 
 
 
 
1,800,000 
3,400,000 
 
 
 
 
Payments for Repurchase of Equity, Prepaid Forward
$ 78,000,000 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Treasury Shares Acquired, Estimated, Prepaid Forward
 
 
 
9.2 
 
 
 
 
 
 
 
 
 
 
 
Stockholders' equity (Details)
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Common Class A [Member]
Dec. 31, 2015
Common Class A [Member]
Sep. 30, 2016
Common Class B [Member]
Dec. 31, 2015
Common Class B [Member]
Sep. 30, 2017
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
 
 
 
 
 
 
 
 
Common stock authorized (shares)
 
 
500,000,000 
500,000,000 
150,000,000 
150,000,000 
 
 
Common stock issued (shares)
 
 
100,079,000 
104,647,000 
36,673,000 
36,712,000 
 
 
Common stock outstanding (shares)
 
 
100,079,000 
104,647,000 
36,673,000 
36,712,000 
 
 
Stock options outstanding (shares)
9,946,000 
12,379,000 
 
 
 
 
 
 
Restricted stock units outstanding (shares)
 
 
 
 
 
 
7,072,000 
7,970,000 
Employee benefit plans - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
plan
Sep. 30, 2016
Jun. 30, 2014
RSUs [Member]
Chief Executive Officer (CEO) [Member]
Jun. 30, 2014
RSUs [Member]
Vested Immediately [Member]
Chief Executive Officer (CEO) [Member]
Sep. 30, 2017
RSUs [Member]
Vested Immediately [Member]
Chief Executive Officer (CEO) [Member]
Sep. 30, 2016
RSUs [Member]
Vested Immediately [Member]
Chief Executive Officer (CEO) [Member]
Jun. 30, 2014
RSUs [Member]
Share-based Compensation Award, Tranche Two [Member]
Chief Executive Officer (CEO) [Member]
Sep. 30, 2017
Employee Stock Purchase Plan Shares [Member]
Sep. 30, 2017
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Sep. 30, 2017
2014 Equity Incentive Plans [Member]
Stock Options [Member]
Jun. 30, 2017
2014 Equity Incentive Plans [Member]
Minimum [Member]
Stock Options [Member]
Sep. 30, 2017
2014 Equity Incentive Plans [Member]
Minimum [Member]
RSUs [Member]
Sep. 30, 2017
2014 Equity Incentive Plans [Member]
Maximum [Member]
Stock Options [Member]
Sep. 30, 2017
2014 Equity Incentive Plans [Member]
Maximum [Member]
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Number of Stock-based Employee Compensation Plans
3 
 
 
 
 
 
 
 
 
 
 
 
 
 
Shares granted (shares)
5,763,000 
 
4,500,000 
1,500,000 
 
 
3,000,000 
 
 
 
 
 
 
 
Allocated share-based compensation expense
 
 
 
 
$ 0.6 
$ 5.5 
 
 
 
 
 
 
 
 
ESPP stock issued during period (shares)
934,359 
668,107 
 
 
 
 
 
 
 
 
 
 
 
 
ESPP weighted average purchase price of shares purchased (usd per share)
$ 8.02 
$ 9.15 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average price of shares granted (usd per share)
$ 9.45 
 
 
 
 
 
 
 
 
 
 
 
 
 
Unearned stock-based compensation costs
 
 
 
 
 
 
 
 
$ 90.2 
 
 
 
 
 
Unearned stock-based compensation, expected recognition period
2 years 1 month 
 
 
 
 
 
 
 
 
 
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
 
 
 
 
 
 
 
 
 
10 years 
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
 
 
 
 
 
 
3 years 
 
 
 
1 year 
2 years 
4 years 
4 years 
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent
 
 
 
 
 
 
 
85.00% 
 
 
 
 
 
 
Employee benefit plans - Stock Option Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Shares (in thousands)
 
 
Outstanding at beginning of period (shares)
12,379 
 
Granted (shares)
1,773 
 
Exercised (shares)
(1,296)
 
Forfeited/Cancelled (shares)
(2,910)
 
Outstanding at end of period (shares)
9,946 
 
Weighted- average exercise price
 
 
Outstanding at beginning of period (in dollars per share)
$ 12.17 
 
Granted (usd per share)
$ 9.31 
 
Exercised (usd per share)
$ 1.64 
 
Forfeited/Cancelled (usd per share)
$ 18.19 
 
Outstanding at end of period (in dollars per share)
$ 11.28 
 
Aggregate intrinsic value (in thousands)
$ 33,525 
$ 32,772 
Exercisable (shares)
8,069 
 
Exercisable - Weighted average exercise price (in dollars per share)
$ 11.01 
 
Exercisable - Aggregate intrinsic value
$ 31,378 
 
Employee benefit plans - Restricted Stock Units Activity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
RSUs [Member]
Dec. 31, 2016
RSUs [Member]
Shares (in thousands)
 
 
 
Non-vested shares at beginning of period (shares)
 
7,072 
7,970 
Granted (shares)
5,763 
 
 
Vested (shares)
(3,558)
 
 
Forfeited (shares)
(3,103)
 
 
Non-vested shares at end of period (shares)
 
7,072 
7,970 
Weighted- average grant date fair value
 
 
 
Non-vested shares at beginning of period (in dollars per share)
 
$ 13.38 
$ 18.08 
Weighted average price of shares granted (usd per share)
$ 9.45 
 
 
Weighted average price of shares vested (usd per share)
$ 14.43 
 
 
Weighted average price of shares forfeited (usd per share)
$ 16.93 
 
 
Non-vested shares at end of period (in dollars per share)
 
$ 13.38 
$ 18.08 
Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
 
 
 
 
Total stock-based compensation expense
$ 11,875,000 
$ 18,466,000 
$ 36,235,000 
$ 51,601,000 
Total tax benefit recognized
 
 
0 
(15,700,000)
Cost of Revenue [Member]
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
 
 
 
 
Total stock-based compensation expense
445,000 
426,000 
1,355,000 
1,195,000 
Research and Development [Member]
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
 
 
 
 
Total stock-based compensation expense
5,967,000 
8,039,000 
17,039,000 
21,135,000 
Selling and Marketing [Member]
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
 
 
 
 
Total stock-based compensation expense
2,609,000 
3,816,000 
7,295,000 
10,699,000 
General and Administrative [Member]
 
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
 
 
 
 
Total stock-based compensation expense
$ 2,854,000 
$ 6,185,000 
$ 10,546,000 
$ 18,572,000 
Net loss per share Additional Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended
Apr. 12, 2017
Sep. 30, 2017
Class A [Member]
vote
Sep. 30, 2017
Class B [Member]
vote
Apr. 12, 2017
Convertible Debt [Member]
Sep. 30, 2017
Convertible Debt [Member]
Apr. 12, 2017
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
 
 
 
 
 
 
Debt instrument
 
 
 
 
$ 175.0 
$ 175.0 
Interest rate
 
 
 
 
 
3.50% 
Maximum number of shares issuable upon conversion of the notes
 
 
 
20,600,000 
 
 
Treasury Shares Acquired, Estimated, Prepaid Forward
9,200,000 
 
 
 
 
 
Common Stock, Voting Rights, Number
 
1 
10 
 
 
 
Conversion of Stock, Shares Issued
 
1 
 
 
 
 
Net loss per share - Basic and Diluted Net Income per Share Attributable to Common Stockholders (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:
 
 
 
 
Net loss
$ 14,661 
$ (104,068)
$ (127,025)
$ (303,294)
Denominator:
 
 
 
 
Weighted-average common shares—basic for Class A and Class B common stock (shares)
136,236 
140,124 
138,450 
138,875 
Effect of potentially dilutive shares (shares)
4,052 
0 
0 
0 
Weighted-average common shares—diluted for Class A and Class B common stock (shares)
140,288 
140,124 
138,450 
138,875 
Net income per share attributable to common stockholders - Basic (in dollars per share)
$ 0.11 
$ (0.74)
$ (0.92)
$ (2.18)
Net income per share attributable to common stockholders - Diluted (in dollars per share)
$ 0.10 
$ (0.74)
$ (0.92)
$ (2.18)
Net loss per share - Antidilutive Securities Excluded from Computation of Net Income per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]
 
 
 
 
Antidilutive securities excluded from computation of earnings per share (shares)
10,573 
22,693 
10,837 
20,803 
Income taxes - Reconciliation to Federal Statutory Rate (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amount [Abstract]
 
 
 
 
Income tax expense (benefit)
$ (10,844)
$ (12,329)
$ 13,429 
$ (43,562)
Percent [Abstract]
 
 
 
 
Effective tax rate
(284.10%)
10.60% 
(11.80%)
12.60% 
Income taxes - Unrecognized Income Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits
 
 
Unrecognized Tax Benefits, beginning balance
$ 70.3 
$ 56.9 
Unrecognized Tax Benefits, ending balance
$ 70.3 
$ 56.9 
Income taxes - Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]
 
 
 
 
Income tax expense (benefit)
$ (10,844)
$ (12,329)
$ 13,429 
$ (43,562)
Effective tax rate
(284.10%)
10.60% 
(11.80%)
12.60% 
Income taxes - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
 
 
 
 
 
 
 
Income tax expense (benefit)
$ (10,844,000)
$ (12,329,000)
 
 
$ 13,429,000 
$ (43,562,000)
 
Unrecognized tax benefits
70,300,000 
 
 
 
70,300,000 
 
56,900,000 
Unrecognized tax benefits that would impact effective tax rate
16,300,000 
 
 
 
16,300,000 
 
 
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
$ (3,817,000)
$ 116,397,000 
 
 
$ 113,596,000 
$ 346,856,000 
 
Effective tax rate
(284.10%)
10.60% 
 
 
(11.80%)
12.60% 
 
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
 
 
10.60% 
12.60% 
 
 
 
Commitments, contingencies and guarantees - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Long-term Purchase Commitment [Line Items]
 
 
 
 
Product warranty accrual, current
$ 9,303,000 
$ 9,303,000 
 
$ 11,456,000 
Other commitment
11,800,000 
11,800,000 
 
53,700,000 
Other Commitments, Remainder of 2017
2,900,000 
2,900,000 
 
 
Other Commitment, Due 2018
5,400,000 
5,400,000 
 
 
Other Commitment, Due in 2019
3,500,000 
3,500,000 
 
 
Purchase obligation, reduction
41,900,000 
41,900,000 
 
 
Term of agreement terminated
 
3 years 6 months 
 
 
Facilities Lease [Member]
 
 
 
 
Long-term Purchase Commitment [Line Items]
 
 
 
 
Future minimum sublease rentals
 
 
 
139,500,000 
Rent expense
$ 4,600,000 
$ 14,600,000 
$ 14,400,000 
 
Commitments, contingencies and guarantees - Schedule of Product Warranty Liability Activity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
 
 
 
 
Beginning balances
$ 9,974 
$ 8,939 
$ 11,944 
$ 10,855 
Settlements of warranty claims
(6,273)
(4,068)
(15,651)
(14,525)
Charged to cost of revenue
5,986 
4,485 
13,394 
13,026 
Ending balances
$ 9,687 
$ 9,356 
$ 9,687 
$ 9,356 
Concentrations of risk and geographic information - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
United States [Member]
Sep. 30, 2016
United States [Member]
Sep. 30, 2017
Outside the United States [Member]
Dec. 31, 2016
Outside the United States [Member]
Revenue, Major Customer [Line Items]
 
 
 
 
 
 
 
 
Revenue
$ 329,805,000 
$ 240,569,000 
$ 844,945,000 
$ 644,860,000 
$ 375,900,000 
$ 310,700,000 
 
 
Long-lived assets
 
 
 
 
 
 
$ 79,900,000 
$ 76,600,000 
Concentrations of risk and geographic information - Schedule of Customer Concentration by Risk Factor (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Customer Concentration Risk [Member]
Accounts Receivable [Member]
Customer A [Member]
Sep. 30, 2017
Customer Concentration Risk [Member]
Accounts Receivable [Member]
Customer A [Member]
Dec. 31, 2016
Customer Concentration Risk [Member]
Accounts Receivable [Member]
Customer B [Member]
Sep. 30, 2017
Customer Concentration Risk [Member]
Accounts Receivable [Member]
Customer B [Member]
Sep. 30, 2017
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer A [Member]
Sep. 30, 2016
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer A [Member]
Sep. 30, 2017
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer A [Member]
Sep. 30, 2016
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer A [Member]
Sep. 30, 2016
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer B [Member]
Sep. 30, 2016
Customer Concentration Risk [Member]
Sales Revenue [Member]
Customer B [Member]
Concentration Risk [Line Items]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Concentration risk
 
 
 
 
15.00% 
13.00% 
27.00% 
20.00% 
16.00% 
21.00% 
16.00% 
19.00% 
10.00% 
12.00% 
Accounts receivable sold
$ 51,593 
$ 35,210 
$ 130,555 
$ 99,514 
 
 
 
 
 
 
 
 
 
 
Factoring fees
$ 473 
$ 267 
$ 1,153 
$ 726 
 
 
 
 
 
 
 
 
 
 
Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]
 
 
 
 
Revenue
$ 329,805 
$ 240,569 
$ 844,945 
$ 644,860 
Americas [Member]
 
 
 
 
Segment Reporting Information [Line Items]
 
 
 
 
Revenue
163,430 
135,895 
416,164 
345,770 
Europe, Middle East and Africa [Member]
 
 
 
 
Segment Reporting Information [Line Items]
 
 
 
 
Revenue
97,179 
77,346 
245,256 
198,338 
Asia and Pacific Area Countries [Member]
 
 
 
 
Segment Reporting Information [Line Items]
 
 
 
 
Revenue
$ 69,196 
$ 27,328 
$ 183,525 
$ 100,752 
Restructuring charges - Restructuring Costs (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
$ 6,500 
$ 16,788 
$ 6,508 
Cost of Revenue [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
458 
364 
Research and Development [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
8,406 
2,655 
Sales and Marketing [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
5,960 
2,678 
General and Administrative [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
1,964 
811 
Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
3,200 
 
First quarter 2017 restructuring [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
13,600 
 
Restructuring charges
 
13,606 
 
First quarter 2017 restructuring [Member] |
Employee Severance [Member]
 
 
 
Restructuring Cost and Reserve [Line Items]
 
 
 
Restructuring charges
 
$ 10,435 
 
Restructuring charges (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 6 Months Ended 9 Months Ended
Jan. 12, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Sep. 30, 2017
First quarter 2017 restructuring [Member]
employee
Sep. 30, 2017
First quarter 2017 restructuring [Member]
Employee Severance and Pay Related Costs [Member]
Nov. 29, 2016
Fourth quarter 2016 restructuring [Member]
Jun. 30, 2017
Fourth quarter 2016 restructuring [Member]
Sep. 30, 2017
Fourth quarter 2016 restructuring [Member]
Dec. 31, 2016
Fourth quarter 2016 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
 
 
 
 
 
 
 
 
 
 
 
Positions eliminated
 
 
 
 
 
270 
 
 
 
 
 
Expected percent of positions eliminated
7.00% 
 
 
 
 
 
 
15.00% 
 
 
 
Expected cost
 
 
 
 
 
 
 
 
 
 
$ 40,700,000 
Restructuring charges
 
6,500,000 
16,788,000 
6,508,000 
3,200,000 
13,600,000 
 
 
3,200,000 
 
 
Restructuring charges
 
 
 
 
 
$ 13,606,000 
$ 10,435,000 
 
 
$ 3,182,000 
 
Restructuring charges - Restructuring Liability (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended
Sep. 30, 2017
Fourth quarter 2016 restructuring [Member]
Sep. 30, 2017
Fourth quarter 2016 restructuring [Member]
Employee Severance [Member]
Sep. 30, 2017
Fourth quarter 2016 restructuring [Member]
Other Restructuring [Member]
Sep. 30, 2017
First quarter 2017 restructuring [Member]
Sep. 30, 2017
First quarter 2017 restructuring [Member]
Employee Severance [Member]
Sep. 30, 2017
First quarter 2017 restructuring [Member]
Other Restructuring [Member]
Dec. 31, 2016
First quarter 2017 restructuring [Member]
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
 
 
 
 
 
 
 
Restructuring liability as of October 1, 2016
$ 10,539 
$ 424 
 
$ 0 
$ 0 
$ 175 
$ 0 
Restructuring charges
3,182 
 
 
13,606 
10,435 
 
 
Cash paid
(13,247)
 
 
 
 
 
 
Non-cash settlements
0 
 
0 
 
 
 
 
Restructuring liability as of December 31, 2016
$ 474 
$ 424 
$ 50 
$ 704 
$ 529 
$ 175 
$ 0