GoPro (GPRO) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document, Entity and Informatio

Document, Entity and Information - USD ($)	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Entity Registrant Name	GoPro, Inc.
Entity Central Index Key	1,500,435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 868,700,000,000
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		112,158,370
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		35,958,034

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 104,987	$ 202,504
Marketable securities	39,846	44,886
Accounts receivable, net	81,431	112,935
Inventory	132,619	150,551
Prepaid expenses and other current assets	32,703	62,811
Total current assets	391,586	573,687
Property and equipment, net	62,791	68,587
Intangible assets, net	21,844	24,499
Goodwill	146,459	146,459
Other long-term assets	26,194	37,014
Total assets	648,874	850,246
Current liabilities:
Accounts payable	87,534	138,257
Accrued liabilities	146,945	213,030
Deferred revenue	15,235	19,244
Total current liabilities	249,714	370,531
Long-term taxes payable	18,559	21,188
Long-term debt	132,189	130,048
Other long-term liabilities	32,335	29,774
Total liabilities	432,797	551,541
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, 101,034 and 104,647 shares issued and outstanding, respectively; 150,000 Class B shares authorized, 35,966 and 36,712 shares issued and outstanding, respectively	866,033	854,452
Treasury stock, at cost, 10,710 and 1,545 shares, respectively	(113,613)	(113,613)
Accumulated deficit	(536,343)	(442,134)
Total stockholders’ equity	216,077	298,705
Total liabilities and stockholders’ equity	$ 648,874	$ 850,246

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
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	10,710,000
Common Class A [Member]
Common Stock, Shares Authorized (shares)	500,000,000	500,000,000
Common Stock, Shares, Issued (shares)	102,709,000	101,034,000
Common stock, shares, outstanding (shares)	102,709,000	101,034,000
Common Class B [Member]
Common Stock, Shares Authorized (shares)	150,000,000	150,000,000
Common Stock, Shares, Issued (shares)	35,964,000	35,966,000
Common stock, shares, outstanding (shares)	35,964,000	35,966,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 202,346	$ 218,614
Cost of revenue	157,430	150,048
Gross profit	44,916	68,566
Operating expenses:
Research and development	50,979	66,166
Sales and marketing	49,170	67,856
General and administrative	19,506	22,759
Total operating expenses	119,655	156,781
Operating income (loss)	(74,739)	(88,215)
Interest expense	(4,567)	(814)
Other income (expense), net	177	161
Total other expense, net	(4,390)	(653)
Income (loss) before income taxes	(79,129)	(88,868)
Income tax expense	(2,782)	22,282
Net Income (loss)	$ (76,347)	$ (111,150)
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ (0.55)	$ (0.78)
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ (0.55)	$ (0.78)
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares)	137,857	142,899
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares)	137,857	142,899

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Net income (loss)	$ (76,347)	$ (111,150)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	8,907	11,693
Stock-based compensation	10,823	13,125
Deferred income taxes	(593)	(2,050)
Non-cash restructuring charges	2,933	966
Non-cash interest expense	1,934
Amortization of Debt Discount (Premium)		0
Other	272	1,630
Changes in operating assets and liabilities:
Accounts receivable, net	31,277	109,588
Inventory	17,932	(40,543)
Prepaid expenses and other assets	26,138	(14,936)
Accounts payable and other liabilities	(117,879)	(105,524)
Deferred revenue	(2,509)	(737)
Net cash provided by (used in) operating activities	(97,112)	(137,938)
Investing activities:
Purchases of property and equipment, net	(6,782)	(5,166)
Purchases of marketable securities	(14,896)	0
Maturities of marketable securities	20,000	14,160
Sale of marketable securities	0	11,623
Net cash provided by (used in) investing activities	(1,678)	20,617
Financing activities:
Proceeds from issuance of common stock	3,210	6,038
Payments Related to Tax Withholding for Share-based Compensation	(2,402)	(6,283)
Payment of deferred acquisition-related consideration	0	(75)
Net cash provided by financing activities	808	(320)
Effect of exchange rate changes on cash and cash equivalents	465	404
Net increase (decrease) in cash and cash equivalents	(97,517)	(117,237)
Cash and cash equivalents at beginning of period	202,504	192,114
Cash and cash equivalents at end of period	$ 104,987	$ 74,877

Summary of business and signifi

Summary of business and significant accounting policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of business and significant accounting policies GoPro, Inc. (GoPro or the Company) is enabling the way people capture and share their lives from a perspective only achieved with a GoPro. What began as an idea to help athletes document themselves engaged in sport, GoPro has become a mobile storytelling solution that helps the world share itself through immersive content. To date, the Company’s cameras and mountable and wearable accessories have generated substantially all of its revenue. The Company sells its products globally through retailers, wholesale distributors, and on its 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, 2017 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, 2017. Except for accounting policies related to revenue recognition and intra-entity asset transfers that were updated as a result of adopting Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, and ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory, 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 (PCS), price protection and other sales incentives), 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. Accounts receivable and allowance for doubtful accounts. Accounts receivable are stated at invoice value less estimated allowances for doubtful accounts. Allowances are recorded based on the Company’s assessment of various factors, such as: historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions and other factors that may affect a customer’s ability to pay. The allowance for doubtful accounts as of March 31, 2018 and December 31, 2017 was $0.7 million and $0.8 million , respectively. Warranty. The Company records a liability for estimated product warranty costs at the time product revenue is recognized. The Company’s standard warranty obligation to its end-users generally provides a 12 -month warranty coverage on all of its products except in the European Union where the Company provides a 2 -year warranty. The Company also offers extended warranty programs for a fee. The Company’s estimate of costs to service its warranty obligations is based on its historical experience of repair and replacement of the associated products and expectations of future conditions. The warranty obligation is affected by product failure rates and the related use of materials, labor costs and freight incurred in correcting any product failure. Revenue recognition. Revenue is primarily comprised of product revenue, net of returns and variable consideration. The Company derives substantially all of its revenue from the sale of cameras, drones, mounts and accessories and the related implied post contract support to customers. The Company recognizes revenue when control of the promised goods or services are transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is deemed probable. For customers who purchase products directly from the Company’s website, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred under ASU 2014-19. The Company's standard terms and conditions of sale for non-web based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return to certain large retailers and distributors. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated refund liability along with a right to recover assets are also recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company’s camera and drone sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera or drone) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive PCS. PCS includes the right to receive, on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company accounts for and allocates revenue to PCS based on a cost plus method. Revenue is allocated to the remaining performance obligations on a residual value method. The Company’s process to allocate the transaction price considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company’s support, the amount of time and cost that is allocated to the Company’s efforts to develop the undelivered elements, and market trends in the pricing for similar offerings. Revenue allocated to the delivered hardware, related embedded firmware and free software solutions is recognized at the time of sale provided the conditions for recognition of revenue have been met. Revenue allocated to PCS is deferred and recognized on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of March 31, 2018 and December 31, 2017 also included immaterial amounts related to the Company’s GoPro Care and GoPro Plus fee-based service offerings. The Company’s deferred revenue balance related to PCS was $14.1 million as of March 31, 2018 and the Company recognized $5.5 million of related revenue during the three months ended March 31, 2018 . Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors. Sales taxes. Sales taxes collected from customers and remitted to respective governmental authorities are recorded as liabilities and are not included in revenue. The Company maintained its policy to exclude sales taxes from revenue under the adoption of ASU 2014-09. Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker. 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 Company’s date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards that were adopted 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 Adoption of the standard resulted in the recognition of previously unrecognized deferred charges using a modified retrospective method. The Company recorded a reversal of the $15.0 million of deferred charges, an increase to U.S. deferred tax assets of $1.2 million with a corresponding U.S. valuation allowance of $1.2 million. The net impact to equity was an increase in the accumulated deficit of approximately $15.0 million upon adoption. Stock Compensation 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 adopted ASU 2017-09 which did not impact its condensed consolidated financial statements and related disclosures. The Company adopted the amendment on a prospective basis. Revenue from Contracts with Customers ASU No. 2014-09, 2015-14, 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 modified retrospective basis method is permitted. January 1, 2018 The Company completed an analysis of the impact of the new standard on its sales contract portfolio by reviewing its previous accounting policies and practices to identify differences that would result from applying the requirements of the new standard to its sales contracts. The Company’s analysis of its contracts under the new standard supported the recognition of its product revenue at the time the product is delivered, and PCS revenue on a straight-line basis, consistent with its previous revenue policy. As a result of the adoption of the new standard, the Company recorded a $2.9 million increase to its accumulated deficit on January 1, 2018, of which $4.9 million related to certain estimated sales incentives which would have been recognized at the time the product was shipped in the prior period, partially offset by $2.0 million related to revenue that would have been recognized in the prior period from the Company’s website sales that had shipped but had not been delivered as of December 31, 2017. Sales incentives are considered variable consideration under the new standard and are accounted for as a reduction to the transaction price. This change resulted in a reduction of revenue being recorded earlier than under the previous guidance. Additionally, for customers who purchased products directly from the Company’s website, the new standard provides for a policy election whereby the Company has recorded revenue when the related product was shipped. This change resulted in recognition of revenue earlier than under previous guidance. In addition, the Company recorded a $1.0 million increase to deferred tax assets and a corresponding $1.0 million increase in valuation allowance. The Company adopted the standard using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Prior periods were not retrospectively adjusted. Refer below for the impact on each financial statement line item as of and for the three months ended March 31, 2018 due to the adoption of the standard. The cumulative effect of the changes made to the Company’s condensed consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09, Revenue from Contracts with Customers and ASU 2016-16, Income Taxes — Intra-Entity Transfers of Assets Other Than Inventory , were as follows: (in thousands) Balance at December 31, 2017 Adjustment due to ASU 2014-09 Adjustment due to ASU 2016-16 Balance at January 1, 2018 Accumulated deficit $ (442,134 ) $ (2,872 ) $ (14,990 ) $ (459,996 ) As mentioned above, the adoption of ASU 2014-09 impacted the timing of revenue recognized related to certain sales incentives and sales from the Company’s website, which impacted the revenue and current deferred revenue financial statement line items. Additionally, under ASU 2014-09, the Company presents an estimated refund liability along with a right to recover asset for future product returns, which impacted the accounts receivable, net, inventory, net, prepaid expenses and other assets, and accrued liabilities financial statement line items. The above adjustments do not impact net cash used in operating activities, however, they do impact the changes in operating assets and liabilities for the related accounts within the disclosure of operating activities on the statement of cash flow. Refer to the tables below for the quantitative impact to the Company’s financial statements as of and for the quarter ended March 31, 2018 due to the adoption of ASU 2014-09 (ASC 606). For the three months ended March 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balance Under ASC 605 Revenue $ 202,346 $ 6,956 $ 209,302 As of March 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balance Under ASC 605 Accounts receivable, net $ 81,431 $ (19,980 ) $ 61,451 Inventory, net 132,619 7,526 140,145 Prepaid expenses and other current assets 32,703 (7,526 ) 25,177 Accrued liabilities 146,945 (19,980 ) 126,965 Current deferred revenue 15,235 602 15,837 Standard Description Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted 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 condensed 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. 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 condensed consolidated financial statements and related disclosures. Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these additional accounting pronouncements has had or will have a material impact on its financial statements.

Fair value measurements

Fair value measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value measurements	Fair value measurements The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows: March 31, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 33,074 $ — $ 33,074 $ 25,251 $ — $ 25,251 Commercial paper 9,990 — 9,990 14,981 — 14,981 Corporate debt securities — — — — 2,500 2,500 Agency securities — — — — 4,999 4,999 Total cash equivalents $ 43,064 $ — $ 43,064 $ 40,232 $ 7,499 $ 47,731 Marketable securities: U.S. treasury securities $ — $ 4,985 $ 4,985 $ — $ 4,995 $ 4,995 Commercial paper 17,397 — 17,397 19,888 — 19,888 Corporate debt securities — 17,464 17,464 — 20,003 20,003 Total marketable securities $ 17,397 $ 22,449 $ 39,846 $ 19,888 $ 24,998 $ 44,886 (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $61.9 million and $154.8 million as of March 31, 2018 and December 31, 2017 , 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. The contractual maturities of available-for-sale marketable securities as of March 31, 2018 and December 31, 2017 were all less than one year in duration. At March 31, 2018 and December 31, 2017 , 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 March 31, 2018 and December 31, 2017 , the amortized cost of the Company’s cash equivalents and marketable securities approximated their fair value and there were no material realized or unrealized gains or losses, either individually or in the aggregate. In April 2017, the Company issued $175.0 million principal amount of Convertible Senior Notes due 2022 (Notes) (see Note 4 , Financing Arrangements ). The estimated fair value of the Notes is based on quoted market prices of the Company’s instruments in markets that are not active and are classified as Level 2 within the fair value hierarchy. The Company estimated the fair value of the Notes by evaluating quoted market prices and calculating the upfront cash payment a market participant would require to assume these obligations. The calculated fair value of the Notes, of $149.6 million , is highly correlated to the Company’s stock price and as a result, significant changes to the Company’s stock price will have a significant impact on the calculated fair value of the Notes. For certain other financial assets and liabilities, including accounts receivable, accounts payable and other current assets and liabilities, the carrying amounts approximate their fair value primarily due to the relatively short maturity of these balances.

Condensed consolidated financia

Condensed consolidated financial statement details Condensed consolidated financial statement details	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated financial statement details	Condensed consolidated financial statement details The following sections and tables provide details of selected balance sheet items. Inventory (in thousands) March 31, 2018 December 31, 2017 Components $ 22,209 $ 18,995 Finished goods 110,410 131,556 Total inventory $ 132,619 $ 150,551 Property and equipment, net (in thousands) March 31, 2018 December 31, 2017 Leasehold improvements $ 67,853 $ 67,713 Production, engineering and other equipment 47,770 47,502 Tooling 24,919 24,871 Computers and software 20,909 20,636 Furniture and office equipment 15,599 14,895 Tradeshow equipment and other 7,235 7,237 Construction in progress 120 347 Gross property and equipment 184,405 183,201 Less: Accumulated depreciation and amortization (121,614 ) (114,614 ) Property and equipment, net $ 62,791 $ 68,587 Intangible assets March 31, 2018 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 49,901 $ (28,672 ) $ 21,229 In-process research and development (IPR&D) 615 — 615 Total intangible assets $ 50,516 $ (28,672 ) $ 21,844 December 31, 2017 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 49,901 $ (26,017 ) $ 23,884 IPR&D 615 — 615 Total intangible assets $ 50,516 $ (26,017 ) $ 24,499 For the three months ended March 31, 2018 and 2017 , the Company did not record any impairment charges for in-process research and development (IPR&D) assets. As of March 31, 2018 , 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 $2.7 million and $2.3 million in the three months ended March 31, 2018 and 2017 , respectively. At March 31, 2018 , expected amortization expense of intangible assets with definite lives for future periods is as follows: (in thousands) Total Year ending December 31, 2018 (remaining 9 months) $ 8,659 2019 7,458 2020 4,242 2021 870 2022 — $ 21,229 Other long-term assets (in thousands) March 31, 2018 December 31, 2017 Point of purchase (POP) displays $ 15,828 $ 16,451 Long-term deferred tax assets 1,251 825 Deposits and other 9,115 19,738 Other long-term assets $ 26,194 $ 37,014 Accrued liabilities (in thousands) March 31, 2018 December 31, 2017 Accrued payables (1) $ 38,698 $ 44,582 Employee related liabilities (1) 15,100 24,945 Accrued sales incentives 36,281 89,549 Refund liability 19,980 — Warranty liability 9,082 9,934 Customer deposits 10,114 8,700 Income taxes payable 1,049 1,247 Purchase order commitments 4,914 6,162 Inventory received 6,751 14,470 Other 4,976 13,441 Accrued liabilities $ 146,945 $ 213,030 (1) See Note 11 for amounts associated with restructuring liabilities. Product warranty The following table summarizes the warranty liability activity: Three months ended March 31, (in thousands) 2018 2017 Beginning balance $ 10,373 $ 11,945 Charged to cost of revenue 4,758 4,226 Settlement of warranty claims (5,724 ) (4,729 ) Ending balance $ 9,407 $ 11,442

Financing Arrangements

Financing Arrangements	3 Months Ended
	Mar. 31, 2018
Line of Credit Facility [Line Items]
Financing Arrangements	Financing Arrangements Credit Facility In March 2016, the Company entered into a Credit Agreement (Credit Agreement) with certain banks which provides for a secured revolving credit facility (Credit Facility) under which the Company may borrow up to an aggregate of $250.0 million . The Company and its lenders may increase the total commitments under the Credit Facility to up to $300.0 million , subject to certain conditions. The Credit Facility will terminate and any 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 the Company’s inventory and accounts receivable balances. Borrowed funds accrue interest, at the Company’s election, based on an annual rate of (a) London Interbank Offered Rate (LIBOR) or (b) the administrative agent’s base rate, plus an applicable margin of between 1.50% and 2.00% for LIBOR rate loans, and between 0.50% and 1.00% for base rate loans. The Company is required to pay a commitment fee on the unused portion of the Credit Facility of 0.25% or 0.375% per annum, based on the level of utilization of the Credit Facility. Amounts owed under the Credit Agreement and related credit documents are guaranteed by the Company and its material subsidiaries. The Company and its Cayman and Netherlands subsidiaries have also granted security interests in substantially all of their assets to collateralize this obligation. The Credit Agreement contains customary covenants, such as financial statement reporting requirements and limiting the ability of the Company and its subsidiaries to pay dividends or incur debt, create liens and encumbrances, make investments, and redeem or repurchase stock. The Company is required to maintain a minimum fixed charge coverage ratio if and when the unborrowed availability under the Credit Facility is less than the greater of $25.0 million or 10.0% of the borrowing base at such time. The Credit Agreement also contains customary events of default, such as the failure to pay obligations when due, initiation of bankruptcy or insolvency proceedings, or defaults on certain other indebtedness. Upon an event of default, the lenders may, subject to customary cure rights, require the immediate payment of all amounts outstanding and foreclose on collateral. At March 31, 2018 and December 31, 2017 , the Company could borrow up to approximately $68.3 million and $118.0 million , respectively, under the Credit Facility, and was in compliance with all financial covenants contained in the Credit Agreement. The Company has made no borrowings from the Credit Facility to date. Convertible Notes In April 2017, the Company issued $175.0 million aggregate principal amount of 3.50% Convertible Senior Notes due 2022 (Notes). The Notes are senior, unsecured obligations of GoPro and 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. Based on current and projected liquidity, the Company has the intent and ability to deliver cash up to the principal amount of the Notes then outstanding upon conversion. The Company pays interest on the Notes semi-annually in arrears on April 15 and October 15 of each year. The $175.0 million of proceeds received from the issuance of the Notes were allocated between long-term debt (liability component) of $128.3 million and additional paid-in-capital (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 accretion of the Notes to par and debt issuance cost is amortized into interest expense over the term of the Note using an effective interest rate of 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. The $4.2 million of issuance costs recorded as long-term debt on the condensed consolidated balance sheet are being amortized over the five-year contractual term of the Notes using the effective interest method. 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 have the option to convert the Notes 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. 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 15, 2022 , a holder may convert its Notes, in multiples of $1,000 principal amount. 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 March 31, 2018 , the outstanding principal on the Notes was $175.0 million , the unamortized debt discount was $39.4 million , the unamortized debt issuance cost was $3.4 million and the net carrying amount of the liability component was $132.2 million , which was recorded as long-term debt within the condensed consolidated balance sheet. For the three months ended March 31, 2018 , the Company recorded interest expense of $1.5 million for contractual coupon interest, $0.2 million for amortization of debt issuance costs and $1.9 million 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 condensed 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	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee benefit plans	Employee benefit plans Equity incentive plans . The Company has outstanding equity grants from its three stock-based employee compensation plans: the 2014 Equity Incentive Plan (2014 Plan), the 2010 Equity Incentive Plan (2010 Plan) and the 2014 Employee Stock Purchase Plan (ESPP). No new options or awards have been granted under the 2010 Plan since June 2014. Outstanding options and awards under the 2010 Plan continue to be subject to the terms and conditions of the 2010 Plan. Options granted under the 2014 Plan generally expire within ten years from the date of grant and generally vest over one to four years. Restricted stock units (RSUs) granted under the 2014 Plan generally vest over two to four years based upon continued service and are settled at vesting in shares of the Company’s Class A common stock. The ESPP allows eligible employees to purchase shares of the Company’s Class A common stock through payroll deductions at a price equal to 85% of the lesser of the fair market value of the stock as of the first date or the ending date of each six month offering period. For additional information regarding the Company’s equity incentive plans, refer to the audited financial statements contained in the 2017 Annual Report. S tock options A summary of the Company’s stock option activity for the three months ended March 31, 2018 is as follows: Shares (in thousands) Weighted- average Weighted-average remaining contractual term (in years) Aggregate intrinsic value Outstanding at December 31, 2017 9,809 $ 11.16 6.00 $ 19,971 Granted — — Exercised (222 ) 0.86 Forfeited/Cancelled (555 ) 12.84 Outstanding at March 31, 2018 9,032 $ 11.31 5.12 $ 10,931 Vested and expected to vest at March 31, 2018 9,020 $ 11.31 5.11 $ 10,931 Exercisable at March 31, 2018 8,093 $ 11.27 4.72 $ 10,931 The aggregate intrinsic value of the stock options outstanding as of March 31, 2018 represents the value of the Company’s closing stock price on March 31, 2018 in excess of the exercise price multiplied by the number of options outstanding. Restricted stock units A summary of the Company’s RSU activity for the three months ended March 31, 2018 is as follows: Shares (in thousands) Weighted- average grant date fair value Non-vested shares at December 31, 2017 9,483 $ 11.87 Granted 122 6.04 Vested (1,246 ) 11.02 Forfeited (1,859 ) 11.91 Non-vested shares at March 31, 2018 6,500 $ 11.91 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 zero and $0.5 million for the three months ended March 31, 2018 and 2017 , respectively. Employee stock purchase plan. For the three months ended March 31, 2018 and 2017 , the Company issued 632,046 and 625,811 shares under its ESPP, respectively, at weighted average prices of $4.78 and $8.02 , 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 2017 Annual Report. The following table summarizes stock-based compensation expense included in the condensed consolidated statements of operations: Three months ended March 31, (in thousands) 2018 2017 Cost of revenue $ 382 $ 495 Research and development 5,005 5,682 Sales and marketing 2,747 2,691 General and administrative 2,689 4,257 Total stock-based compensation expense $ 10,823 $ 13,125 The income tax benefit related to stock-based compensation expense was zero for the three months ended March 31, 2018 and 2017 due to a full valuation allowance on the Company’s U.S. net deferred tax assets (see Note 7 below). At March 31, 2018 , total unearned stock-based compensation of $65.4 million related to stock options, RSUs and ESPP shares is expected to be recognized over a weighted average period of 1.8 years.

Net loss per share

Net loss per share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss per share	Net loss per share The following table presents the calculations of basic and diluted net loss per share: Three months ended March 31, (in thousands, except per share data) 2018 2017 Numerator: Net loss $ (76,347 ) $ (111,150 ) Denominator: Weighted-average common shares—basic for Class A and Class B common stock 137,857 142,899 Effect of dilutive stock-based awards — — Weighted-average common shares—diluted for Class A and Class B common stock 137,857 142,899 Net loss per share Basic $ (0.55 ) $ (0.78 ) Diluted $ (0.55 ) $ (0.78 ) 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 March 31, (in thousands) 2018 2017 Effect of anti-dilutive stock-based awards 17,593 20,720 The Company’s Notes mature on April 15, 2022 , unless earlier repurchased or converted into shares of Class A common stock under certain circumstances as described further in Note 4 , Financing Arrangements , 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. Based on the Company’s current and projected liquidity, the Company has the intent and ability to deliver cash up to the principal amount of the Notes subject to conversion. As such, no shares associated with the Note conversion were included in the Company’s weighted-average number of common shares outstanding for any periods presented. While the Company has the intent and ability to deliver cash up to the principal amount, the maximum number of shares issuable upon conversion of the Notes is 20.6 million shares of Class A common stock. Additionally, the calculation of weighted-average shares outstanding as of March 31, 2018 excludes approximately 9.2 million shares effectively repurchased and held in treasury stock on the condensed consolidated balance sheet as a result of the Prepaid Forward transaction entered into in connection with the Note offering. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible at any time at the option of the stockholder into one share of Class A common stock and has no expiration date. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date when the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of common stock then outstanding. Class A common stock is not convertible into Class B common stock. The computation of the diluted net loss per share of Class A common stock assumes the conversion of Class B common stock.

Income taxes

Income taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
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 deferred tax assets are 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. In each quarter, the Company updates its estimate of the annual effective tax rate, and if the estimated annual tax rate changes, a cumulative adjustment is made in that quarter. Three months ended March 31, (dollars in thousands) 2018 2017 Income tax (benefit) expense $ (2,782 ) $ 22,282 Effective tax rate 3.5 % (25.1 )% The Company recorded an income tax benefit of $2.8 million for the three months ended March 31, 2018 on a pre-tax net loss of $79.1 million , which resulted in an effective tax rate of 3.5% . The Company’s income tax benefit for the three months ended March 31, 2018 was composed of $0.4 million of tax expense incurred on pre-tax income in profitable foreign jurisdictions, and one-time items that included $10.9 million of tax benefit primarily relating to the conclusion of the IRS audit and the release of uncertain tax positions, $4.2 million of tax benefit relating to restructuring expenses, $1.1 million of net non-deductible equity tax expense, and $0.2 million tax expense relating to other items, offset by $10.6 million net decrease in the valuation allowance. For the three months ended March 31, 2017 , the Company recorded an income tax provision of $22.3 million on a pre-tax net loss of $88.9 million , which resulted in a negative effective tax rate of 25.1% . The Company’s income tax provision for the three months ended March 31, 2017 was principally composed of tax expenses incurred on pre-tax income in profitable foreign jurisdictions. Due to certain tax structure changes effective January 1, 2018, including the planned liquidation of the Company’s subsidiary, Woodman Labs Cayman, Inc., the Company’s tax provision and resulting effective tax rate for interim periods in 2018 and future years is expected to be subject to less volatility and fluctuation quarter over quarter than in 2017. Further, for both 2018 and 2017, 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. During the quarter ended March 31, 2018 , the Internal Revenue Service concluded its audit for the 2012 through 2015 tax years. The Closing Agreement was received on January 24, 2018 and the Company received an income tax refund of approximately $32.9 million , net of IRS adjustments, in February 2018. As a result, the Company recognized a reduction in gross unrecognized tax benefits of $26.0 million and an income tax benefit, net of valuation allowance, of approximately $2.6 million . At March 31, 2018 and December 31, 2017 , the Company’s gross unrecognized tax benefits were $33.0 million and $58.6 million , respectively. If recognized, $16.9 million of these unrecognized tax benefits (net of U.S. federal benefit) at March 31, 2018 would be recorded as a reduction of future income tax provision. These unrecognized tax benefits relate primarily to unresolved matters with taxing authorities regarding 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 and tax positions on IP transfers. Although the completion, settlement and closure of any audits is uncertain, it is reasonably possible that the total amount of unrecognized tax benefits will not materially increase within the next 12 months. However, given the number of years remaining that are subject to examination, the range of the reasonably possible change cannot by estimated reliably. U.S. Tax Reform. The Tax Cuts and Jobs Act (TCJA) of 2017, enacted on December 22, 2017, reduced the U.S. statutory tax rate from 35% to 21%, effective January 1, 2018. The TCJA also implemented a territorial tax system. Under the territorial tax system, in general, the Company’s foreign earnings would no longer be subject to tax in the U.S. As part of transitioning to the territorial tax system, the TCJA includes a mandatory deemed repatriation of all undistributed foreign earnings that are subject to a U.S. income tax. The Company estimates that the deemed repatriation will not result in any additional U.S. income tax. This estimate may be impacted by a number of additional considerations, including, but not limited to, the issuance of final regulations and the Company's ongoing analysis of the new law. While the TJCA provides for a territorial tax system, beginning in 2018, it includes two new U.S. tax base erosion provisions, the global intangible low-taxed income (GILTI) provisions and the base-erosion and anti-abuse tax (BEAT) provisions. The GILTI provisions require the Company to include in its U.S. income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. The BEAT provisions in the TCJA eliminates the deduction of certain base-erosion payments made to related foreign corporations and impose a minimum tax if greater than regular tax. The BEAT or GILTI provisions did not result in significant additional U.S. tax beginning in 2018. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118) to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the TCJA. The Company has recognized the provisional tax impacts related to deemed repatriated earnings and the revaluation of deferred tax assets and liabilities to the extent needed and included these amounts in its consolidated financial statements for the year ended December 31, 2017. The ultimate impact may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be issued, and actions the Company may take as a result of the TCJA. The accounting is expected to be complete when the 2017 U.S. corporate income tax return is filed in 2018.

Related party transactions

Related party transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
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 a de minimis expense in the three months ended March 31, 2018 and zero expense in the three months ended March 31, 2017 . As of March 31, 2018 and December 31, 2017 , the Company had $0.3 million and zero accounts payable associated with these aircraft fees, respectively.

Commitments, contingencies and

Commitments, contingencies and guarantees	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
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 March 31, 2018 , the Company’s total future minimum lease payments under non-cancelable operating leases were $122.6 million . There have been no material changes to the Company’s lease commitments since December 31, 2017. Rent expense was $3.4 million and $5.2 million for the three months ended March 31, 2018 and 2017 , 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; debt agreements; and various other contractual commitments. As of March 31, 2018 , the Company’s total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $183.4 million . There have been no material changes to the Company’s other commitments since December 31, 2017. 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 March 31, 2018 , 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 geog

Concentrations of risk and geographic information	3 Months Ended
	Mar. 31, 2018
Risks and Uncertainties [Abstract]
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: March 31, 2018 December 31, 2017 Customer A 21% 16% Customer B 31% 32% Customer C * 12% Customer D * 11% The following table summarizes the Company’s accounts receivables sold, without recourse, and factoring fees paid: Three months ended March 31, (in thousands) 2018 2017 Accounts receivable sold $ 18,596 $ 37,388 Factoring fees 221 313 Customers who represented 10% or more of the Company’s total revenue were as follows: Three months ended March 31, 2018 2017 Customer A 14% 16% Customer B 14% * * 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 March 31, (in thousands) 2018 2017 Americas $ 90,472 $ 95,707 Europe, Middle East and Africa (EMEA) 62,310 67,863 Asia and Pacific (APAC) 49,564 55,044 Total revenue $ 202,346 $ 218,614 Revenue in the United States, which is included in the Americas geographic region, was $78.9 million and $86.8 million for the three months ended March 31, 2018 and 2017 , 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 March 31, 2018 and December 31, 2017 , long-lived assets, which represent gross property and equipment, located outside the United States, primarily in Hong Kong and China, were $80.6 million and $79.7 million , respectively.

Restructuring charges

Restructuring charges	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring charges	Restructuring charges Restructuring charges for each period were as follows: Three months ended March 31, (in thousands) 2018 2017 Cost of revenue $ 1,239 $ 393 Research and development 9,599 5,679 Sales and marketing 3,618 5,242 General and administrative 2,282 1,141 Total restructuring charges $ 16,738 $ 12,455 First quarter 2018 restructuring On January 2, 2018, the Company approved a restructuring plan to further reduce future operating expense and better align resources around its long-term business strategy. The restructuring provided for a reduction of the Company's global workforce of approximately 18% , the closure of the Company's aerial group and the consolidation of certain leased office facilities. Under the first quarter 2018 restructuring plan, the Company recorded restructuring charges of $14.2 million , including $11.9 million related to severance and $2.3 million related to other charges. The following table provides a summary of the Company’s restructuring activities for the three months ended March 31, 2018 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, 2017 $ — $ — $ — Restructuring charges 11,895 2,271 14,166 Cash paid (9,332 ) (138 ) (9,470 ) Non-cash reductions (226 ) (793 ) (1,019 ) Restructuring liability as of March 31, 2018 $ 2,337 $ 1,340 $ 3,677 First quarter 2017 restructuring On March 15, 2017, the Company approved a restructuring plan to reduce future operating expenses and further align resources around its long-term business strategy. The restructuring provided for a reduction of the Company’s global workforce by approximately 270 positions, and the consolidation of certain leased office facilities. Under the first quarter 2017 restructuring plan, the Company recorded restructuring charges of $19.1 million , including $10.3 million related to severance, and $8.8 million related to accelerated depreciation and other charges. The actions associated with the first quarter 2017 restructuring plan were substantially completed by 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 three months ended March 31, 2018 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, 2017 $ — $ 3,550 $ 3,550 Restructuring charges — 2,139 2,139 Cash paid — (819 ) (819 ) Non-cash charges — 262 262 Restructuring liability as of March 31, 2018 $ — $ 5,132 $ 5,132 Fourth quarter 2016 restructuring On November 29, 2016, the Company approved a restructuring plan 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 plan, the Company recorded restructuring charges of $40.2 million , including $37.0 million related to severance, and $3.2 million related to accelerated depreciation and other charges. The actions associated with the fourth quarter 2016 restructuring plan were completed by March 31, 2017, with only small incremental charges recorded through March 31, 2018. The following table provides a summary of the Company’s restructuring activities for the three months ended March 31, 2018 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, 2017 $ 400 $ 50 $ 450 Restructuring charges 434 — 434 Cash paid (241 ) — (241 ) Restructuring liability as of March 31, 2018 $ 593 $ 50 $ 643 First quarter 2016 restructuring On January 12, 2016, the Company approved a restructuring plan that provided for a reduction in the Company’s global workforce of approximately 7% . Under the first quarter 2016 restructuring plan, the Company recorded restructuring charges of $6.5 million in the first quarter of 2016, which primarily included cash-based severance costs. The Company completed this plan at the end of the first quarter of 2016 and all costs have been paid. No charges were recorded in periods after March 31, 2016.

Summary of business and signi17

Summary of business and significant accounting policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
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, 2017 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, 2017.
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 (PCS), price protection and other sales incentives), 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
Accounts receivable and allowance for doubtful accounts	Accounts receivable and allowance for doubtful accounts. Accounts receivable are stated at invoice value less estimated allowances for doubtful accounts. Allowances are recorded based on the Company’s assessment of various factors, such as: historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions and other factors that may affect a customer’s ability to pay. The allowance for doubtful accounts as of March 31, 2018 and December 31, 2017 was $0.7 million and $0.8 million , respectively.
Warranty	Warranty. The Company records a liability for estimated product warranty costs at the time product revenue is recognized. The Company’s standard warranty obligation to its end-users generally provides a 12 -month warranty coverage on all of its products except in the European Union where the Company provides a 2 -year warranty. The Company also offers extended warranty programs for a fee. The Company’s estimate of costs to service its warranty obligations is based on its historical experience of repair and replacement of the associated products and expectations of future conditions. The warranty obligation is affected by product failure rates and the related use of materials, labor costs and freight incurred in correcting any product failure.
Revenue Recognition, Policy [Policy Text Block]	Revenue recognition. Revenue is primarily comprised of product revenue, net of returns and variable consideration. The Company derives substantially all of its revenue from the sale of cameras, drones, mounts and accessories and the related implied post contract support to customers. The Company recognizes revenue when control of the promised goods or services are transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is deemed probable. For customers who purchase products directly from the Company’s website, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred under ASU 2014-19. The Company's standard terms and conditions of sale for non-web based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return to certain large retailers and distributors. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated refund liability along with a right to recover assets are also recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company’s camera and drone sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera or drone) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive PCS. PCS includes the right to receive, on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company accounts for and allocates revenue to PCS based on a cost plus method. Revenue is allocated to the remaining performance obligations on a residual value method. The Company’s process to allocate the transaction price considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company’s support, the amount of time and cost that is allocated to the Company’s efforts to develop the undelivered elements, and market trends in the pricing for similar offerings. Revenue allocated to the delivered hardware, related embedded firmware and free software solutions is recognized at the time of sale provided the conditions for recognition of revenue have been met. Revenue allocated to PCS is deferred and recognized on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of March 31, 2018 and December 31, 2017 also included immaterial amounts related to the Company’s GoPro Care and GoPro Plus fee-based service offerings. The Company’s deferred revenue balance related to PCS was $14.1 million as of March 31, 2018 and the Company recognized $5.5 million of related revenue during the three months ended March 31, 2018 .
Sales Incentives [Policy Text Block]	Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors.
Sales Taxes [Policy Text Block]	Sales taxes. Sales taxes collected from customers and remitted to respective governmental authorities are recorded as liabilities and are not included in revenue. The Company maintained its policy to exclude sales taxes from revenue under the adoption of ASU 2014-09.
Segment Reporting, Policy [Policy Text Block]	Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker.
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	Standard Description Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted 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 condensed 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. 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 condensed consolidated financial statements and related disclosures.

Summary of business and signi18

Summary of business and significant accounting policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of recent accounting pronouncements	The cumulative effect of the changes made to the Company’s condensed consolidated January 1, 2018 balance sheet for the adoption of ASU 2014-09, Revenue from Contracts with Customers and ASU 2016-16, Income Taxes — Intra-Entity Transfers of Assets Other Than Inventory , were as follows: (in thousands) Balance at December 31, 2017 Adjustment due to ASU 2014-09 Adjustment due to ASU 2016-16 Balance at January 1, 2018 Accumulated deficit $ (442,134 ) $ (2,872 ) $ (14,990 ) $ (459,996 ) As mentioned above, the adoption of ASU 2014-09 impacted the timing of revenue recognized related to certain sales incentives and sales from the Company’s website, which impacted the revenue and current deferred revenue financial statement line items. Additionally, under ASU 2014-09, the Company presents an estimated refund liability along with a right to recover asset for future product returns, which impacted the accounts receivable, net, inventory, net, prepaid expenses and other assets, and accrued liabilities financial statement line items. The above adjustments do not impact net cash used in operating activities, however, they do impact the changes in operating assets and liabilities for the related accounts within the disclosure of operating activities on the statement of cash flow. Refer to the tables below for the quantitative impact to the Company’s financial statements as of and for the quarter ended March 31, 2018 due to the adoption of ASU 2014-09 (ASC 606). For the three months ended March 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balance Under ASC 605 Revenue $ 202,346 $ 6,956 $ 209,302 As of March 31, 2018 (in thousands) As Reported Under ASC 606 Effect of Change Balance Under ASC 605 Accounts receivable, net $ 81,431 $ (19,980 ) $ 61,451 Inventory, net 132,619 7,526 140,145 Prepaid expenses and other current assets 32,703 (7,526 ) 25,177 Accrued liabilities 146,945 (19,980 ) 126,965 Current deferred revenue 15,235 602 15,837 Recent accounting standards Standard Description Company’s date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards that were adopted 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 Adoption of the standard resulted in the recognition of previously unrecognized deferred charges using a modified retrospective method. The Company recorded a reversal of the $15.0 million of deferred charges, an increase to U.S. deferred tax assets of $1.2 million with a corresponding U.S. valuation allowance of $1.2 million. The net impact to equity was an increase in the accumulated deficit of approximately $15.0 million upon adoption. Stock Compensation 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 adopted ASU 2017-09 which did not impact its condensed consolidated financial statements and related disclosures. The Company adopted the amendment on a prospective basis. Revenue from Contracts with Customers ASU No. 2014-09, 2015-14, 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 modified retrospective basis method is permitted. January 1, 2018 The Company completed an analysis of the impact of the new standard on its sales contract portfolio by reviewing its previous accounting policies and practices to identify differences that would result from applying the requirements of the new standard to its sales contracts. The Company’s analysis of its contracts under the new standard supported the recognition of its product revenue at the time the product is delivered, and PCS revenue on a straight-line basis, consistent with its previous revenue policy. As a result of the adoption of the new standard, the Company recorded a $2.9 million increase to its accumulated deficit on January 1, 2018, of which $4.9 million related to certain estimated sales incentives which would have been recognized at the time the product was shipped in the prior period, partially offset by $2.0 million related to revenue that would have been recognized in the prior period from the Company’s website sales that had shipped but had not been delivered as of December 31, 2017. Sales incentives are considered variable consideration under the new standard and are accounted for as a reduction to the transaction price. This change resulted in a reduction of revenue being recorded earlier than under the previous guidance. Additionally, for customers who purchased products directly from the Company’s website, the new standard provides for a policy election whereby the Company has recorded revenue when the related product was shipped. This change resulted in recognition of revenue earlier than under previous guidance. In addition, the Company recorded a $1.0 million increase to deferred tax assets and a corresponding $1.0 million increase in valuation allowance. The Company adopted the standard using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Prior periods were not retrospectively adjusted. Refer below for the impact on each financial statement line item as of and for the three months ended March 31, 2018 due to the adoption of the standard.

Fair value measurements (Tables

Fair value measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Assets measured at fair value on recurring basis	The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows: March 31, 2018 December 31, 2017 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 33,074 $ — $ 33,074 $ 25,251 $ — $ 25,251 Commercial paper 9,990 — 9,990 14,981 — 14,981 Corporate debt securities — — — — 2,500 2,500 Agency securities — — — — 4,999 4,999 Total cash equivalents $ 43,064 $ — $ 43,064 $ 40,232 $ 7,499 $ 47,731 Marketable securities: U.S. treasury securities $ — $ 4,985 $ 4,985 $ — $ 4,995 $ 4,995 Commercial paper 17,397 — 17,397 19,888 — 19,888 Corporate debt securities — 17,464 17,464 — 20,003 20,003 Total marketable securities $ 17,397 $ 22,449 $ 39,846 $ 19,888 $ 24,998 $ 44,886 (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $61.9 million and $154.8 million as of March 31, 2018 and December 31, 2017 , respectively.

Condensed consolidated financ20

Condensed consolidated financial statement details (Tables)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventory	Inventory (in thousands) March 31, 2018 December 31, 2017 Components $ 22,209 $ 18,995 Finished goods 110,410 131,556 Total inventory $ 132,619 $ 150,551
Property, Plant and Equipment	Property and equipment, net (in thousands) March 31, 2018 December 31, 2017 Leasehold improvements $ 67,853 $ 67,713 Production, engineering and other equipment 47,770 47,502 Tooling 24,919 24,871 Computers and software 20,909 20,636 Furniture and office equipment 15,599 14,895 Tradeshow equipment and other 7,235 7,237 Construction in progress 120 347 Gross property and equipment 184,405 183,201 Less: Accumulated depreciation and amortization (121,614 ) (114,614 ) Property and equipment, net $ 62,791 $ 68,587
Schedule of Finite-Lived Intangible Assets	Intangible assets March 31, 2018 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 49,901 $ (28,672 ) $ 21,229 In-process research and development (IPR&D) 615 — 615 Total intangible assets $ 50,516 $ (28,672 ) $ 21,844 December 31, 2017 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 49,901 $ (26,017 ) $ 23,884 IPR&D 615 — 615 Total intangible assets $ 50,516 $ (26,017 ) $ 24,499
Schedule of Future Amortization	Amortization expense was $2.7 million and $2.3 million in the three months ended March 31, 2018 and 2017 , respectively. At March 31, 2018 , expected amortization expense of intangible assets with definite lives for future periods is as follows: (in thousands) Total Year ending December 31, 2018 (remaining 9 months) $ 8,659 2019 7,458 2020 4,242 2021 870 2022 — $ 21,229
Schedule of Other Assets	Other long-term assets (in thousands) March 31, 2018 December 31, 2017 Point of purchase (POP) displays $ 15,828 $ 16,451 Long-term deferred tax assets 1,251 825 Deposits and other 9,115 19,738 Other long-term assets $ 26,194 $ 37,014
Schedule of Accrued Liabilities	Accrued liabilities (in thousands) March 31, 2018 December 31, 2017 Accrued payables (1) $ 38,698 $ 44,582 Employee related liabilities (1) 15,100 24,945 Accrued sales incentives 36,281 89,549 Refund liability 19,980 — Warranty liability 9,082 9,934 Customer deposits 10,114 8,700 Income taxes payable 1,049 1,247 Purchase order commitments 4,914 6,162 Inventory received 6,751 14,470 Other 4,976 13,441 Accrued liabilities $ 146,945 $ 213,030
Schedule of Product Warranty Liability	Product warranty The following table summarizes the warranty liability activity: Three months ended March 31, (in thousands) 2018 2017 Beginning balance $ 10,373 $ 11,945 Charged to cost of revenue 4,758 4,226 Settlement of warranty claims (5,724 ) (4,729 ) Ending balance $ 9,407 $ 11,442

Employee benefit plans (Tables)

Employee benefit plans (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of the Company’s stock option activity for the three months ended March 31, 2018 is as follows: Shares (in thousands) Weighted- average Weighted-average remaining contractual term (in years) Aggregate intrinsic value Outstanding at December 31, 2017 9,809 $ 11.16 6.00 $ 19,971 Granted — — Exercised (222 ) 0.86 Forfeited/Cancelled (555 ) 12.84 Outstanding at March 31, 2018 9,032 $ 11.31 5.12 $ 10,931 Vested and expected to vest at March 31, 2018 9,020 $ 11.31 5.11 $ 10,931 Exercisable at March 31, 2018 8,093 $ 11.27 4.72 $ 10,931
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	A summary of the Company’s RSU activity for the three months ended March 31, 2018 is as follows: Shares (in thousands) Weighted- average grant date fair value Non-vested shares at December 31, 2017 9,483 $ 11.87 Granted 122 6.04 Vested (1,246 ) 11.02 Forfeited (1,859 ) 11.91 Non-vested shares at March 31, 2018 6,500 $ 11.91
Allocation of Stock-based Compensation Expense	The following table summarizes stock-based compensation expense included in the condensed consolidated statements of operations: Three months ended March 31, (in thousands) 2018 2017 Cost of revenue $ 382 $ 495 Research and development 5,005 5,682 Sales and marketing 2,747 2,691 General and administrative 2,689 4,257 Total stock-based compensation expense $ 10,823 $ 13,125

Net loss per share (Tables)

Net loss per share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Net Income per Share, Basic and Diluted	The following table presents the calculations of basic and diluted net loss per share: Three months ended March 31, (in thousands, except per share data) 2018 2017 Numerator: Net loss $ (76,347 ) $ (111,150 ) Denominator: Weighted-average common shares—basic for Class A and Class B common stock 137,857 142,899 Effect of dilutive stock-based awards — — Weighted-average common shares—diluted for Class A and Class B common stock 137,857 142,899 Net loss per share Basic $ (0.55 ) $ (0.78 ) Diluted $ (0.55 ) $ (0.78 )
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 March 31, (in thousands) 2018 2017 Effect of anti-dilutive stock-based awards 17,593 20,720

Income taxes (Tables)

Income taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Three months ended March 31, (dollars in thousands) 2018 2017 Income tax (benefit) expense $ (2,782 ) $ 22,282 Effective tax rate 3.5 % (25.1 )%

Concentrations of risk and ge24

Concentrations of risk and geographic information (Tables)	3 Months Ended
	Mar. 31, 2018
Concentration Risk [Line Items]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table summarizes the Company’s accounts receivables sold, without recourse, and factoring fees paid: Three months ended March 31, (in thousands) 2018 2017 Accounts receivable sold $ 18,596 $ 37,388 Factoring fees 221 313
Schedule of Revenue by Geographic Region	Revenue by geographic region, based on ship-to destinations, was as follows: Three months ended March 31, (in thousands) 2018 2017 Americas $ 90,472 $ 95,707 Europe, Middle East and Africa (EMEA) 62,310 67,863 Asia and Pacific (APAC) 49,564 55,044 Total revenue $ 202,346 $ 218,614
Accounts Receivable [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	Customers who represented 10% or more of the Company’s net accounts receivable balance were as follows: March 31, 2018 December 31, 2017 Customer A 21% 16% Customer B 31% 32% Customer C * 12% Customer D * 11%
Sales Revenue [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	Customers who represented 10% or more of the Company’s total revenue were as follows: Three months ended March 31, 2018 2017 Customer A 14% 16% Customer B 14% * * Less than 10% of total revenue for the period indicated

Restructuring charges (Tables)

Restructuring charges (Tables)	3 Months Ended
	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	Restructuring charges for each period were as follows: Three months ended March 31, (in thousands) 2018 2017 Cost of revenue $ 1,239 $ 393 Research and development 9,599 5,679 Sales and marketing 3,618 5,242 General and administrative 2,282 1,141 Total restructuring charges $ 16,738 $ 12,455
Schedule of Restructuring Reserve by Type of Cost	The following table provides a summary of the Company’s restructuring activities for the three months ended March 31, 2018 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, 2017 $ — $ 3,550 $ 3,550 Restructuring charges — 2,139 2,139 Cash paid — (819 ) (819 ) Non-cash charges — 262 262 Restructuring liability as of March 31, 2018 $ — $ 5,132 $ 5,132 The following table provides a summary of the Company’s restructuring activities for the three months ended March 31, 2018 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, 2017 $ — $ — $ — Restructuring charges 11,895 2,271 14,166 Cash paid (9,332 ) (138 ) (9,470 ) Non-cash reductions (226 ) (793 ) (1,019 ) Restructuring liability as of March 31, 2018 $ 2,337 $ 1,340 $ 3,677 The following table provides a summary of the Company’s restructuring activities for the three months ended March 31, 2018 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, 2017 $ 400 $ 50 $ 450 Restructuring charges 434 — 434 Cash paid (241 ) — (241 ) Restructuring liability as of March 31, 2018 $ 593 $ 50 $ 643

Summary of business and signi26

Summary of business and significant accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Accumulated deficit	$ (536,343)		$ (459,996)	$ (442,134)
Accounts receivable, net	81,431			112,935
Revenue	$ 202,346	$ 218,614
Warranty Period	12 months
Deferred Revenue	$ 14,100
Allowance for Doubtful Accounts Receivable, Current	700			800
Deferred Revenue, Revenue Recognized	5,500
Inventory	132,619			150,551
Prepaid expenses and other current assets	32,703			62,811
Accrued liabilities	146,945			213,030
Deferred revenue	15,235			$ 19,244
Accounting Standards Update 2015-16 [Member]
Property, Plant and Equipment [Line Items]
Accumulated deficit			(14,990)
Adjustments for New Accounting Pronouncement [Member]
Property, Plant and Equipment [Line Items]
Accounts receivable, net	61,451
Revenue	209,302
Inventory	140,145
Prepaid expenses and other current assets	25,177
Accrued liabilities	126,965
Deferred revenue	15,837
Accounting Standards Update 2014-09 [Member]
Property, Plant and Equipment [Line Items]
Accumulated deficit			$ (2,872)
Accounts receivable, net	(19,980)
Revenue	6,956
Inventory	7,526
Prepaid expenses and other current assets	(7,526)
Accrued liabilities	(19,980)
Deferred revenue	$ 602
European Union [Member]
Property, Plant and Equipment [Line Items]
Warranty Period	2 years

Summary of business and signi27

Summary of business and significant accounting policies New Accounting Pronouncement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Deficit	$ (536,343)		$ (459,996)	$ (442,134)
Revenue	202,346	$ 218,614
Accounts Receivable, Net	81,431			112,935
Inventory	132,619			150,551
Prepaid Expense and Other current Assets	32,703			62,811
Accrued liabilities	146,945			213,030
Deferred Revenue	15,235			$ 19,244
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Deficit			(2,872)
Revenue	6,956
Accounts Receivable, Net	(19,980)
Inventory	7,526
Prepaid Expense and Other current Assets	(7,526)
Accrued liabilities	(19,980)
Deferred Revenue	$ 602
Accounting Standards Update 2015-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Deficit			$ (14,990)

Fair value measurements (Detail

Fair value measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	$ 61,900	$ 154,800
Marketable securities	39,846	44,886
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	149,600
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	43,064	47,731
Marketable securities	39,846	44,886
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	4,985	4,995
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	17,397	19,888
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	17,464	20,003
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	4,999
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	9,990	14,981
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	33,074	25,251
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	0	2,500
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	43,064	40,232
Marketable securities	17,397	19,888
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury 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	17,397	19,888
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] | Agency Securities [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 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	9,990	14,981
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	33,074	25,251
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]
Cash and Cash Equivalents	0	0
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	0	7,499
Marketable securities	22,449	24,998
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	4,985	4,995
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	17,464	20,003
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	4,999
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Paper [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] | 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	$ 0	$ 2,500

Condensed consolidated financ29

Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 39,846	$ 44,886
Cash	61,900	154,800
Cash and cash equivalents	104,987	202,504	$ 74,877	$ 192,114
Fair Value, Measurements, Recurring [Member]
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 39,846	$ 44,886

Condensed consolidated financ30

Condensed consolidated financial statement details - Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 22,209	$ 18,995
Finished goods	110,410	131,556
Total inventory	$ 132,619	$ 150,551

Condensed consolidated financ31

Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 184,405	$ 183,201
Less: Accumulated depreciation and amortization		(121,614)	(114,614)
Property and equipment, net		62,791	68,587
Depreciation	$ 32,400
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		67,853	67,713
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		47,770	47,502
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		24,919	24,871
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		20,909	20,636
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		15,599	14,895
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		7,235	7,237
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 120	$ 347

Condensed consolidated financ32

Condensed consolidated financial statement details - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value			$ 49,901	$ 49,901
Accumulated amortization			(28,672)	(26,017)
Net carrying value			21,229	23,884
Indefinite lived intangible assets	$ 615		615	615
Intangible Assets, Gross (Excluding Goodwill)			50,516	50,516
Intangible assets, net			21,844	24,499
Indefinite-lived Intangible Assets [Roll Forward]
Balance at December 31, 2016	615
Balance at June 30, 2017	615
Amortization of intangible assets	$ 2,700	$ 2,300
Goodwill			$ 146,459	$ 146,459

Condensed consolidated financ33

Condensed consolidated financial statement details - Future Amortization (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2,018	$ 8,659
2,019	7,458
2,020	4,242
2,021	870
2,022	0
Net carrying value	$ 21,229	$ 23,884

Condensed consolidated financ34

Condensed consolidated financial statement details - Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Business Combination, Goodwill [Abstract]
Goodwill	$ 146,459	$ 146,459

Condensed consolidated financ35

Condensed consolidated financial statement details - Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
POP Displays	$ 15,828	$ 16,451
Long-term deferred tax assets	1,251	825
Deposits and other	9,115	19,738
Other long-term assets	$ 26,194	$ 37,014

Condensed consolidated financ36

Condensed consolidated financial statement details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued payables	$ 38,698	$ 44,582
Employee related liabilities	15,100	24,945
Accrued sales incentives	36,281	89,549
Customer Refund Liability, Current	19,980	0
Warranty liability	9,082	9,934
Customer deposits	10,114	8,700
Income taxes payable	1,049	1,247
Purchase Commitment, Remaining Minimum Amount Committed	4,914	6,162
Inventory received	6,751	14,470
Other	4,976	13,441
Accrued liabilities	$ 146,945	$ 213,030

Condensed consolidated financ37

Condensed consolidated financial statement details - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Beginning balances	$ 10,373	$ 11,945
Charged to cost of revenue	4,758	4,226
Settlements of warranty claims	(5,724)	(4,729)
Ending balances	9,407	$ 11,442
Warranty liability	$ 9,082		$ 9,934

Financing Arrangements (Details

Financing Arrangements (Details) $ / shares in Units, shares in Millions	Apr. 12, 2017USD ($)$ / sharesshares	Mar. 31, 2016USD ($)	Mar. 31, 2018USD ($)shares	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Line of Credit Facility [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 128,300,000
Convertible debt, equity portion	46,700,000
Long-term debt			$ 132,189,000		$ 130,048,000
Amortization of Debt Discount (Premium)				$ 0
Payments for Repurchase of Equity, Prepaid Forward	$ 78,000,000
Treasury Shares Acquired, Estimated, Prepaid Forward | shares	9.2		9
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit agreement, current borrowing capacity		$ 250,000,000
Credit agreement, maximum borrowing capacity		300,000,000
Minimum Fixed Charge Coverage Ratio, minimum balance		$ 25,000,000
Minimum Fixed Charge Coverage Ratio, minimum percent		10.00%
Line of Credit Facility, Remaining Borrowing Capacity			$ 68,000,000		$ 118,000,000
Amount outstanding			0
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt instrument	$ 175,000,000		175,000,000
Debt Instrument, Unamortized Discount			$ 39,400,000
Interest rate	3.50%
Debt Instrument, Convertible, Conversion Ratio	94.0071
Convertible Debt Principal Amount Conversion	$ 1,000
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 10.64
Effective rate			10.50%
Debt Issuance Costs, Net			$ 5,700,000
Percentage of conversion price of notes			130.00%
Percentage of trading price of notes			98.00%
Long-term debt			$ 132,200,000
Interest Expense, Debt			1,500,000
Amortization of Debt Issuance Costs			200,000
Amortization of Debt Discount (Premium)			1,900,000
Long-term Debt [Member] | Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			4,200,000
Debt Issuance Costs, Net			3,400,000
Additional Paid-in Capital [Member] | Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			$ 1,500,000
Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage		0.25%
Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage		0.375%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		2.00%
Base Rate [Member] | Minimum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		0.50%
Base Rate [Member] | Maximum [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate		1.00%

Employee benefit plans - Narrat

Employee benefit plans - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Jun. 30, 2014shares	Mar. 31, 2018USD ($)plan$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Stock-based Employee Compensation Plans | plan		3
Shares granted (shares)		122,000
ESPP stock issued during period (shares)		632,046	625,811
ESPP weighted average purchase price of shares purchased (usd per share) | $ / shares		$ 4.78	$ 8.02
Weighted average price of shares granted (usd per share) | $ / shares		$ 6.04
Unearned stock-based compensation, expected recognition period		1 year 9 months 25 days
RSUs [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	4,500,000
RSUs [Member] | Vested Immediately [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)	1,500,000
RSUs [Member] | Share-based Compensation Award, Tranche Two [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
Shares granted (shares)	3,000,000
Allocated share-based compensation expense | $		$ 0	$ 0.5
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase Price of Common Stock, Percent		85.00%
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs | $		$ 65.4
2014 Equity Incentive Plans [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period		10 years
2014 Equity Incentive Plans [Member] | Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		1 year
2014 Equity Incentive Plans [Member] | Minimum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		2 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		4 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period		4 years

Employee benefit plans - Stock

Employee benefit plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Shares (in thousands)
Outstanding at beginning of period (shares)	9,809
Granted (shares)	0
Exercised (shares)	(222)
Forfeited/Cancelled (shares)	(555)
Outstanding at end of period (shares)	9,032	9,809
Weighted- average exercise price
Outstanding at beginning of period (in dollars per share)	$ 11.16
Granted (usd per share)	0
Exercised (usd per share)	0.86
Outstanding at end of period (in dollars per share)	$ 11.31	$ 11.16
Weighted Average Remaining Contractual Term (in years)	5 years 1 month 12 days	6 years
Aggregate intrinsic value (in thousands)	$ 10,931	$ 19,971
Vested and Expected to Vest (shares)	9,020
Vested and Expected to Vest - Weighted Average Exercise Price (in dollars per share)	$ 11.31
Vested and Expected to Vest- Weighted Average Remaining Contractual Term	5 years 1 month 10 days
Vested and Expected to Vest - Aggregate Intrinsic Value	$ 10,931
Exercisable (shares)	8,093
Exercisable - Weighted average exercise price (in dollars per share)	$ 11.27
Exercisable - Weighted Average Remaining Contractual Term	4 years 8 months 18 days
Exercisable - Aggregate intrinsic value	$ 10,931
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 12.84

Employee benefit plans - Restri

Employee benefit plans - Restricted Stock Units Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Shares (in thousands)
Granted (shares) | shares	122
Vested (shares) | shares	(1,246)
Forfeited (shares) | shares	(1,859)
Weighted- average grant date fair value
Weighted average price of shares granted (usd per share) | $ / shares	$ 6.04
Weighted average price of shares vested (usd per share) | $ / shares	11.02
Weighted average price of shares forfeited (usd per share) | $ / shares	$ 11.91
RSUs [Member]
Shares (in thousands)
Non-vested shares at beginning of period (shares) | shares	9,483
Non-vested shares at end of period (shares) | shares	6,500
Weighted- average grant date fair value
Non-vested shares at beginning of period (in dollars per share) | $ / shares	$ 11.87
Non-vested shares at end of period (in dollars per share) | $ / shares	$ 11.91

Employee benefit plans - Alloca

Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 10,823	$ 13,125
Total tax benefit recognized	0	0
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	382	495
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	5,005	5,682
Selling and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	2,747	2,691
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 2,689	$ 4,257

Net loss per share Additional I

Net loss per share Additional Information (Details) $ in Millions	Apr. 12, 2017USD ($)shares	Mar. 31, 2018USD ($)shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Shares Acquired, Estimated, Prepaid Forward	9,200,000	9,000,000
Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number		1
Conversion of Stock, Shares Issued		1
Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number		10
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt instrument | $	$ 175	$ 175
Interest rate	3.50%
Maximum number of shares issuable upon conversion of the notes	21,000,000

Net loss per share - Basic and

Net loss per share - Basic and Diluted Net Income per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss)	$ (76,347)	$ (111,150)
Denominator:
Weighted-average common shares—basic for Class A and Class B common stock (shares)	137,857	142,899
Effect of potentially dilutive shares (shares)	0	0
Weighted-average common shares—diluted for Class A and Class B common stock (shares)	137,857	142,899
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ (0.55)	$ (0.78)
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ (0.55)	$ (0.78)

Net loss per share - Antidiluti

Net loss per share - Antidilutive Securities Excluded from Computation of Net Income per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	17,593	20,720

Income taxes - Income Tax Expen

Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ (2,782)	$ 22,282
Effective Income Tax Rate Reconciliation, Percent	3.50%	(25.10%)

Income taxes - Unrecognized Inc

Income taxes - Unrecognized Income Tax Benefits (Details) $ in Thousands	Mar. 31, 2018USD ($)
Reconciliation of Unrecognized Tax Benefits
Unrecognized Tax Benefits, beginning balance	$ 58,584
Unrecognized Tax Benefits, ending balance	$ 33,000

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (79,129)	$ (88,868)
Effective Income Tax Rate Reconciliation, Percent	3.50%	(25.10%)
Current Foreign Tax Expense (Benefit)	$ 400
Income Tax Effects Allocated Directly to Equity, Other	1,100
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	10,900
Other Tax Expense (Benefit)	200
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	10,600
Proceeds from Income Tax Refunds	32,900
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	26,000
Income Tax Expense (Benefit)	(2,782)	$ 22,282
Unrecognized tax benefits	33,000		$ 58,584
Unrecognized tax benefits that would impact effective tax rate	16,900
Restructuring Charges [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense (Benefit)	$ 4,200

Income taxes Income Taxes (Deta

Income taxes Income Taxes (Details) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ (2,782)	$ 22,282
Effective Income Tax Rate Reconciliation, Percent	3.50%	(25.10%)

Related party transactions (Det

Related party transactions (Details) - Chief Executive Officer (CEO) [Member] - Related Party Transaction, Chartered Aircraft Expenses [Member] - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Expense for services rendered	$ 0
Accounts payable to related party		$ 296,700	$ 0

Commitments, contingencies an51

Commitments, contingencies and guarantees - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Long-term Purchase Commitment [Line Items]
Other Commitment	$ 183.4
Facilities Lease [Member]
Long-term Purchase Commitment [Line Items]
Future minimum sublease rentals	122.6
Rent expense	$ 3.4	$ 5.2

Concentrations of risk and ge52

Concentrations of risk and geographic information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue, Major Customer [Line Items]
Revenue	$ 202,346	$ 218,614
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	78,900	$ 86,800
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 80,600		$ 79,700

Concentrations of risk and ge53

Concentrations of risk and geographic information - Schedule of Customer Concentration by Risk Factor (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Concentration Risk [Line Items]
Accounts receivable sold	$ 18,596	$ 37,388
Factoring fees	$ 221	$ 313
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk	21.00%		16.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk	31.00%		32.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk			12.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk			11.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk	14.00%	16.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk	14.00%

Concentrations of risk and ge54

Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 202,346	$ 218,614
United States [Member]
Segment Reporting Information [Line Items]
Revenue	78,900	86,800
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	90,472	95,707
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	62,310	67,863
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 49,564	$ 55,044

Restructuring charges - Restruc

Restructuring charges - Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 16,738	$ 12,455
Cost of Revenue [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,239	393
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,599	5,679
Sales and Marketing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,618	5,242
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,282	1,141
First quarter 2018 restructuring [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	14,200
Restructuring charges	14,166
First quarter 2018 restructuring [Member] [Domain] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	11,895
First quarter 2018 restructuring [Member] [Domain] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,271
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		19,100
Restructuring charges	2,139
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8,800
First quarter 2017 restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	$ 10,300
First quarter 2017 restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,139

Restructuring charges (Details)

Restructuring charges (Details) $ in Thousands	Jan. 02, 2018	Mar. 15, 2017employee	Nov. 29, 2016	Jan. 12, 2016	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Mar. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 16,738	$ 12,455
First quarter 2018 restructuring [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	18.00%
Restructuring charges					14,200
Restructuring charges					14,166
First quarter 2018 restructuring [Member] [Domain] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					11,895
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Positions eliminated | employee		270
Restructuring charges						19,100
Restructuring charges					2,139
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						8,800
First quarter 2017 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0	$ 10,300
Fourth quarter 2016 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated			15.00%
Restructuring charges							$ 40,200
Restructuring charges					434
Fourth quarter 2016 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							3,200
Fourth quarter 2016 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ 37,000
Restructuring charges					$ 434
first quarter 2016 restructuring [Domain]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated				7.00%
Restructuring charges								$ 6,500

Restructuring charges - Restr57

Restructuring charges - Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 16,738	$ 12,455
First quarter 2017 restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	3,550
Restructuring charges	2,139
Restructuring charges		19,100
Cash paid	(819)
Restructuring liability as of December 31, 2016	5,132
First quarter 2017 restructuring [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	0
Restructuring charges	0	10,300
Cash paid	0
Restructuring liability as of December 31, 2016	0
First quarter 2017 restructuring [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	3,550
Restructuring charges	2,139
Cash paid	(819)
Restructuring liability as of December 31, 2016	5,132
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 8,800
Fourth quarter 2016 restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	450
Restructuring charges	434
Restructuring charges			$ 40,200
Cash paid	(241)
Restructuring liability as of December 31, 2016	643
Fourth quarter 2016 restructuring [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	400
Restructuring charges	434
Restructuring charges			37,000
Cash paid	(241)
Restructuring liability as of December 31, 2016	593
Fourth quarter 2016 restructuring [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	50
Restructuring charges	0
Cash paid	0
Restructuring liability as of December 31, 2016	50
Fourth quarter 2016 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges			$ 3,200
First quarter 2018 restructuring [Member] [Domain]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	0
Restructuring charges	14,166
Restructuring charges	14,200
Cash paid	(9,470)
Non-cash settlements	(1,019)
Restructuring liability as of December 31, 2016	3,677
First quarter 2018 restructuring [Member] [Domain] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	0
Restructuring charges	11,895
Cash paid	(9,332)
Non-cash settlements	(226)
Restructuring liability as of December 31, 2016	2,337
First quarter 2018 restructuring [Member] [Domain] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016	0
Restructuring charges	2,271
Cash paid	(138)
Non-cash settlements	(793)
Restructuring liability as of December 31, 2016	$ 1,340