GoPro (GPRO) 10-Q 8 Nov 19 2019 Q3 Quarterly report Financial data

Document, Entity and Informatio

Document, Entity and Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Class of Stock [Line Items]
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0629474
Entity Address, Address Line One	3000 Clearview Way
Entity Address, City or Town	San Mateo,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94402
Title of 12(b) Security	Class A Common Stock
Trading Symbol	GPRO
Entity Registrant Name	GOPRO, INC.
City Area Code	(650)
Local Phone Number	332-7600
Entity Central Index Key	0001500435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-36514
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Security Exchange Name	NASDAQ
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		126,859,037
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		28,896,866

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 43,016,000	$ 152,095,000
Marketable securities	35,960,000	45,417,000
Accounts receivable, net	71,977,000	129,216,000
Inventory	250,032,000	116,458,000
Prepaid expenses and other current assets	24,023,000	30,887,000
Total current assets	425,008,000	474,073,000
Property and equipment, net	39,727,000	46,567,000
Operating Lease, Right-of-Use Asset	52,512,000	0
Intangible assets, net	7,111,000	13,065,000
Goodwill	146,459,000	146,459,000
Other long-term assets	16,528,000	18,195,000
Total assets	687,345,000	698,359,000
Current liabilities:
Accounts payable	140,271,000	148,478,000
Accrued expenses and other current liabilities	159,475,000	135,892,000
Short-term operating lease liabilities	8,890,000	0
Deferred revenue	11,966,000	15,129,000
Total current liabilities	320,602,000	299,499,000
Long-term taxes payable	18,408,000	19,553,000
Long-term debt	146,249,000	138,992,000
Long-term operating lease liabilities	62,554,000	0
Other long-term liabilities	7,973,000	28,203,000
Total liabilities	555,786,000	486,247,000
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, 117,435 and 105,170 shares issued and outstanding, respectively; 150,000 Class B shares authorized, 28,897 and 35,897 shares issued and outstanding, respectively	924,725,000	894,755,000
Treasury stock, at cost, 10,710 and 10,710 shares, respectively	(113,613,000)	(113,613,000)
Accumulated deficit	(679,553,000)	(569,030,000)
Total stockholders’ equity	131,559,000	212,112,000
Total liabilities and stockholders’ equity	$ 687,345,000	$ 698,359,000

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
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	117,435,000	105,170,000
Common stock outstanding (shares)	117,435,000	105,170,000
Common Class B [Member]
Common Stock, Shares Authorized (shares)	150,000,000	150,000,000
Common Stock, Shares, Issued	28,897,000	35,897,000
Common stock outstanding (shares)	28,897,000	35,897,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 131,169	$ 285,936	$ 666,306	$ 770,959
Cost of revenue	102,737	194,904	455,342	551,642
Gross profit	28,432	91,032	210,964	219,317
Operating expenses:
Research and development	34,940	41,157	111,215	130,361
Sales and marketing	48,848	55,871	148,273	165,297
General and administrative	15,842	15,358	49,909	50,588
Total operating expenses	99,630	112,386	309,397	346,246
Operating loss	(71,198)	(21,354)	(98,433)	(126,929)
Interest expense	(4,623)	(4,616)	(14,032)	(13,804)
Other Nonoperating Expense				(268)
Other income (expense), net	738	661	1,503
Total other expense, net	(3,885)	(3,955)	(12,529)	(14,072)
Loss before income taxes	(75,083)	(25,309)	(110,962)	(141,001)
Income tax (benefit) expense	273	(1,780)	500	296
Net loss	$ (74,810)	$ (27,089)	$ (110,462)	$ (140,705)
Earnings Per Share, Basic and Diluted	$ (0.51)	$ (0.19)	$ (0.77)	$ (1.01)
Weighted Average Number of Shares Outstanding, Basic and Diluted	145,617	140,072	144,306	139,028

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net loss	$ (110,462)	$ (140,705)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	19,823	27,773
Amortization of Leased Asset	7,599	0
Stock-based compensation	30,160	31,171
Deferred income taxes	13	(987)
Restructuring Reserve, Settled without Cash		5,788
Non-cash restructuring charges	(199)
Amortization of Debt Discount (Premium)	6,633	5,988
Other	(779)	(301)
Changes in operating assets and liabilities:
Accounts receivable, net	57,160	(36,812)
Inventory	(133,574)	27,302
Prepaid expenses and other assets	8,136	32,203
Accounts payable and other liabilities	6,481	(38,917)
Deferred revenue	(3,686)	(3,350)
Net cash used in operating activities	(112,695)	(90,847)
Investing activities:
Purchases of property and equipment, net	(6,310)	(8,204)
Purchases of marketable securities	(43,636)	(14,896)
Maturities of marketable securities	51,738	55,000
Sale of marketable securities	1,889	0
Net cash provided by investing activities	3,681	31,900
Financing activities:
Proceeds from issuance of common stock	5,574	5,131
Payments Related to Tax Withholding for Share-based Compensation	(5,798)	(5,388)
Net cash used in financing activities	(224)	(257)
Effect of exchange rate changes on cash and cash equivalents	159	(54)
Net change in cash and cash equivalents	(109,079)	(59,258)
Cash and cash equivalents at beginning of period	152,095	202,504
Cash and cash equivalents at end of period	$ 43,016	$ 143,246

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Including Additional Paid in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2017	$ 298,705	$ 854,452	$ (113,613)	$ (442,134)
Beginning Balance (shares) at Dec. 31, 2017		137,000
Common stock issued under employee benefit plans, net of shares withheld for tax	3,186	$ 3,186
Adjustments Related to Tax Withholding for Share-based Compensation	(2,402)	$ 2,402
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,673
Allocated share-based compensation expense	10,797	$ 10,797
Cumulative Effect of New Accounting Principle in Period of Adoption	(17,862)			(17,862)
Net loss	(76,347)			(76,347)
Ending Balance at Mar. 31, 2018	216,077	$ 866,033	(113,613)	(536,343)
Ending Balance (shares) at Mar. 31, 2018		138,673
Beginning Balance at Dec. 31, 2017	298,705	$ 854,452	(113,613)	(442,134)
Beginning Balance (shares) at Dec. 31, 2017		137,000
Net loss	(140,705)
Ending Balance at Sep. 30, 2018	172,046	$ 886,360	(113,613)	(600,701)
Ending Balance (shares) at Sep. 30, 2018		140,583
Beginning Balance at Mar. 31, 2018	216,077	$ 866,033	(113,613)	(536,343)
Beginning Balance (shares) at Mar. 31, 2018		138,673
Common stock issued under employee benefit plans, net of shares withheld for tax	249	$ 249
Adjustments Related to Tax Withholding for Share-based Compensation	(1,350)	$ 1,350
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		833
Allocated share-based compensation expense	10,008	$ 10,008
Net loss	(37,269)			(37,269)
Ending Balance at Jun. 30, 2018	187,715	$ 874,940	(113,613)	(573,612)
Ending Balance (shares) at Jun. 30, 2018		139,506
Common stock issued under employee benefit plans, net of shares withheld for tax	1,721	$ 1,721
Adjustments Related to Tax Withholding for Share-based Compensation	(1,636)	$ 1,636
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,077
Allocated share-based compensation expense	11,335	$ 11,335
Net loss	(27,089)			(27,089)
Ending Balance at Sep. 30, 2018	172,046	$ 886,360	(113,613)	(600,701)
Ending Balance (shares) at Sep. 30, 2018		140,583
Beginning Balance at Dec. 31, 2018	212,112	$ 894,755	(113,613)	(569,030)
Beginning Balance (shares) at Dec. 31, 2018		141,067
Common stock issued under employee benefit plans, net of shares withheld for tax	3,761	$ 3,761
Adjustments Related to Tax Withholding for Share-based Compensation	(2,673)	$ 2,673
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		3,293
Allocated share-based compensation expense	9,782	$ 9,782
Cumulative Effect of New Accounting Principle in Period of Adoption	(61)			(61)
Net loss	(24,365)			(24,365)
Ending Balance at Mar. 31, 2019	198,556	$ 905,625	(113,613)	(593,456)
Ending Balance (shares) at Mar. 31, 2019		144,360
Beginning Balance at Dec. 31, 2018	212,112	$ 894,755	(113,613)	(569,030)
Beginning Balance (shares) at Dec. 31, 2018		141,067
Net loss	(110,462)
Ending Balance at Sep. 30, 2019	131,559	$ 924,725	(113,613)	(679,553)
Ending Balance (shares) at Sep. 30, 2019		146,331
Beginning Balance at Mar. 31, 2019	198,556	$ 905,625	(113,613)	(593,456)
Beginning Balance (shares) at Mar. 31, 2019		144,360
Common stock issued under employee benefit plans, net of shares withheld for tax	144	$ 144
Adjustments Related to Tax Withholding for Share-based Compensation	(1,324)	$ 1,324
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		528
Allocated share-based compensation expense	10,606	$ 10,606
Net loss	(11,287)			(11,287)
Ending Balance at Jun. 30, 2019	196,695	$ 915,051	(113,613)	(604,743)
Ending Balance (shares) at Jun. 30, 2019		144,888
Common stock issued under employee benefit plans, net of shares withheld for tax	1,706	$ 1,706
Adjustments Related to Tax Withholding for Share-based Compensation	(1,801)	$ 1,801
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,443
Allocated share-based compensation expense	9,769	$ 9,769
Net loss	(74,810)			(74,810)
Ending Balance at Sep. 30, 2019	$ 131,559	$ 924,725	$ (113,613)	$ (679,553)
Ending Balance (shares) at Sep. 30, 2019		146,331

Summary of business and signifi

Summary of business and significant accounting policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of business and significant accounting policies GoPro, Inc. and its subsidiaries (GoPro or the Company) helps its consumers capture and share their experiences in immersive and exciting ways. The Company is committed to developing solutions that create an easy, seamless experience for consumers to capture, create and share engaging personal content. To date, the Company’s cameras, mountable and wearable accessories, and subscription services have generated substantially all of its revenue. The Company sells its products globally 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 United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30. The 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, 2018 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, 2018. Except for the accounting policy related to leases that was updated as a result of adopting Accounting Standards Codification (ASC) 842, Leases , there have been no material changes in the Company’s critical accounting policies and estimates from those disclosed in its Annual Report. Principles of consolidation. These condensed consolidated financial statements include all the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Use of estimates. The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s condensed consolidated financial statements and accompanying notes. Significant estimates and assumptions made by management include those related to revenue recognition (including sales incentives, sales returns and implied post contract support), stock-based compensation, inventory valuation, product warranty liabilities, the valuation and useful lives of long-lived assets (property and equipment, operating lease right-of-use assets, intangible assets and goodwill) and income taxes. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from management’s estimates. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected. Comprehensive income (loss). For all periods presented, comprehensive income (loss) approximated net income (loss). Therefore, the condensed consolidated statements of comprehensive income (loss) have been omitted. Prior period reclassifications. Reclassifications of certain prior period amounts in the condensed consolidated financial statements, including a refinement in methodology for revenue by geography, have been made to conform to the current period presentation. Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. Beginning January 1, 2019, operating leases are presented in operating lease right-of-use (ROU) assets, short-term operating lease liabilities and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. ROU assets represent the Company’s right to control the use of an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of future lease payments. The Company determines its incremental borrowing rate based on information available at lease commencement date to calculate the present value of future lease payments. Lease expenses are recognized on a straight-line basis over the lease term. Certain leases include an option to renew with terms that can extend the lease term from one to five years. The exercise of a lease renewal option is at the Company’s sole discretion and is included in the lease term when the Company is reasonably certain it will exercise the option. Prior to January 1, 2019, the Company recognized leases under ASC 840, Leases , which had the following differences from the current lease standard, ASC 842, Leases: • Operating leases were previously not recorded on the Company’s condensed consolidated balance sheets. • The Company calculated a liability for future costs to be incurred under a lease for its remaining term without economic benefit to the Company upon determination of a cease-use date. The fair value of the liability was determined based on remaining lease payments, estimated sublease income and the effects of any prepaid or deferred items recognized under the lease. Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, the related implied post contract support to customers, and subscription services. The Company recognizes revenue when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The transaction price the Company expects to be entitled to is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is considered probable. For the Company’s subscription services, revenue is recognized on a ratable basis over the subscription term, with payments received in advanced of services being rendered recorded in deferred revenue. 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. The Company's standard terms and conditions of sale for non-web based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated refund liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company’s camera sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive support after the initial sale (post contract support or PCS). The Company’s PCS includes the right to receive on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company allocates the transaction price to PCS based on a cost-plus method. The transaction price 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. The transaction prices allocated to the delivered hardware, related embedded firmware and free software solutions are recognized as revenue at the time of sale, provided the conditions for recognition of revenue have been met. The transaction price allocated to PCS is deferred and recognized as revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of September 30, 2019 and December 31, 2018 also included immaterial amounts related to the Company’s GoPro Care and GoPro Plus fee-based service offerings. The Company’s deferred revenue balance was $12.3 million and $16.1 million as of September 30, 2019 and December 31, 2018 , respectively. During the three months ended September 30, 2019 and 2018 , revenue of $5.5 million and $6.1 million , respectively, was recognized that was included in the deferred revenue balances at the beginning of each period. During the nine months ended September 30, 2019 and 2018 , revenue of $12.9 million and $14.6 million , respectively, was recognized that was included in the deferred revenue balances at the beginning of each period. Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, price protection, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors. Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker. Recent accounting standards Standard Description Company’s date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards that were adopted Leases ASU No. 2016-02, 2018-10, 2018-11, 2019-01, (ASC 842) This standard replaces existing lease guidance for lessees and requires operating leases to be recognized on the balance sheet. Under the new standard, lessees recognize a lease liability for the present value of future lease payments and a corresponding right-to-use asset. January 1, 2019 The new standard was applied using a modified retrospective approach. Prior periods were not retrospectively adjusted. The Company completed its analysis of the impact of the standard by reviewing its lease agreements to identify changes resulting from applying the requirements of the new standard. The Company elected to utilize a package of practical expedients, which among other things, allowed the Company to maintain its existing classification of its current leases. The Company also elected the hindsight practical expedient to determine a reasonably certain lease term for existing leases. Additionally, the Company made a policy election to maintain its previous lease accounting for leases with an initial term of 12 months or less. Furthermore, the Company made the policy election to not separate non-lease components from lease components. The Company’s analysis of its lease agreements under the new standard resulted in the recognition of lease liabilities of $88.3 million and lease assets of $60.1 million on its condensed consolidated balance sheet as of January 1, 2019. The new standard did not have a material impact on the Company’s condensed consolidated income statement and condensed consolidated statement of cash flows. The cumulative effect of the changes made to the Company’s condensed consolidated January 1, 2019 balance sheet for the adoption of ASC 842, Leases were as follows: (in thousands) Balance at December 31, 2018 Adjustment due to ASC 842 Balance at January 1, 2019 Operating lease right-of-use assets $ — $ 60,111 $ 60,111 Property and equipment, net (1) 46,567 (57 ) 46,510 Accrued expenses and other current liabilities (2) 135,892 (4,332 ) 131,560 Short-term operating lease liabilities — 10,812 10,812 Long-term operating lease liabilities — 77,545 77,545 Other long-term liabilities (2) 28,203 (23,900 ) 4,303 Accumulated deficit (569,030 ) (61 ) (569,091 ) (1) Represents the reclassification of leasehold acquisition costs to operating lease right-of-use assets. (2) Represents the reclassification of deferred rent, tenant incentives and accrued cease-use charges to operating lease right-of-use assets. Standard Description Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted Intangible - Goodwill and Other ASU No. 2017-04 (Topic 350) This standard simplifies the accounting for goodwill and removes Step 2 of the annual goodwill impairment test. Upon adoption, goodwill impairment 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 is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017, and requires use of 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. Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments ASU No. 2016-13 (Topic 326) The standard changes the impairment model for most financial assets and replaces the existing incurred loss model with a current expected credit loss (CECL) model. The standard should be applied on a modified retrospective approach. January 1, 2020 The Company’s allowance for doubtful accounts and valuation of available-for-sale securities are subject to this standard. The Company is in the process of quantifying the impact on its condensed consolidated financial statements and related disclosures, but does not expect the impact to be material. The Company will evaluate its available-for-sale securities for impairment under Topic 326 upon adoption of this standard. The Company does not expect the results of its evaluation of available-for-sale securities for impairment to have a material impact on its condensed consolidated financial statements and related disclosures. Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these accounting pronouncements has had or will have a material impact on its condensed consolidated financial statements.

Fair value measurements

Fair value measurements	9 Months Ended
	Sep. 30, 2019
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: September 30, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 3,412 $ — $ 3,412 $ 10,901 $ — $ 10,901 Commercial paper — — — 7,577 — 7,577 Total cash equivalents $ 3,412 $ — $ 3,412 $ 18,478 $ — $ 18,478 Marketable securities: U.S. treasury securities $ — $ 8,265 $ 8,265 $ — $ 6,336 $ 6,336 Commercial paper — 7,694 7,694 20,657 — 20,657 Corporate debt securities — 20,001 20,001 — 18,424 18,424 Total marketable securities $ — $ 35,960 $ 35,960 $ 20,657 $ 24,760 $ 45,417 (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $39.6 million and $133.6 million as of September 30, 2019 and December 31, 2018 , respectively. Cash equivalents and marketable securities are classified as Level 1 or Level 2 because the Company uses quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value. The contractual maturities of available-for-sale marketable securities as of September 30, 2019 and December 31, 2018 were all less than one year in duration. At September 30, 2019 and December 31, 2018 , the Company had no financial assets or liabilities that were classified as Level 3, which are valued based on inputs supported by little or no market activity. At September 30, 2019 and December 31, 2018 , 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 $168.0 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	9 Months Ended
	Sep. 30, 2019
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) September 30, 2019 December 31, 2018 Components $ 32,996 $ 19,205 Finished goods 217,036 97,253 Total inventory $ 250,032 $ 116,458 Property and equipment, net (in thousands) September 30, 2019 December 31, 2018 Leasehold improvements $ 50,709 $ 66,198 Production, engineering and other equipment 45,578 43,019 Tooling 19,190 17,808 Computers and software 21,085 20,865 Furniture and office equipment 10,837 14,969 Tradeshow equipment and other 7,009 7,009 Construction in progress 81 80 Gross property and equipment 154,489 169,948 Less: Accumulated depreciation and amortization (114,762 ) (123,381 ) Property and equipment, net $ 39,727 $ 46,567 Intangible assets September 30, 2019 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 50,501 $ (43,405 ) $ 7,096 Domain name 15 — 15 Total intangible assets $ 50,516 $ (43,405 ) $ 7,111 December 31, 2018 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 50,501 $ (37,451 ) $ 13,050 Domain name 15 — 15 Total intangible assets $ 50,516 $ (37,451 ) $ 13,065 Amortization expense was $1.9 million and $3.4 million for the three months ended September 30, 2019 and 2018 , respectively, and $6.0 million and $9.4 million for the nine months ended September 30, 2019 and 2018 , respectively. At September 30, 2019 , expected amortization expense of intangible assets with definite lives for future periods was as follows: (in thousands) Total Year ending December 31, 2019 (remaining 3 months) $ 1,864 2020 4,363 2021 869 2022 — 2023 — $ 7,096 Other long-term assets (in thousands) September 30, 2019 December 31, 2018 Point of purchase (POP) displays $ 8,351 $ 9,130 Long-term deferred tax assets 819 945 Deposits and other 7,358 8,120 Other long-term assets $ 16,528 $ 18,195 Accrued expenses and other current liabilities (in thousands) September 30, 2019 December 31, 2018 Accrued sales incentives $ 43,051 $ 40,918 Accrued payables (1) 34,573 34,696 Employee related liabilities (1) 16,520 19,775 Refund liability 5,445 13,100 Warranty liability 9,072 9,604 Inventory received 25,057 5,061 Customer deposits 20,125 3,105 Purchase order commitments 613 2,015 Income taxes payable 1,261 1,948 Other 3,758 5,670 Accrued expenses and other current liabilities $ 159,475 $ 135,892 (1) See Note 10 Restructuring charges for amounts associated with restructuring liabilities. Product warranty Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance $ 12,850 $ 10,692 $ 10,971 $ 10,373 Charged to cost of revenue 1,610 5,055 12,013 18,163 Settlement of warranty claims (3,981 ) (5,878 ) (12,505 ) (18,667 ) Warranty liability $ 10,479 $ 9,869 $ 10,479 $ 9,869 At September 30, 2019 and December 31, 2018 , $9.1 million and $9.6 million , respectively, of the warranty liability was recorded as an element of accrued expenses and other current liabilities, and $1.4 million

Financing Arrangements

Financing Arrangements	9 Months Ended
	Sep. 30, 2019
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 amount of $250.0 million . The Company and its lenders may increase the total commitments under the Credit Facility to up to an aggregate amount of $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 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 GoPro, Inc. and its material subsidiaries. GoPro, Inc. and its Netherlands subsidiary 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 September 30, 2019 and December 31, 2018 , the Company 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. 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 recorded to long-term debt 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 September 30, 2019 and December 31, 2018 , the outstanding principal on the Notes was $175.0 million , the unamortized debt discount was $26.6 million and $33.3 million , respectively, the unamortized debt issuance cost was $2.1 million and $2.7 million , respectively, and the net carrying amount of the liability component was $146.2 million and $139.0 million , respectively, which was recorded as long-term debt within the condensed consolidated balance sheets. For the three months ended September 30, 2019 and 2018 , the Company recorded interest expense of $1.5 million for contractual coupon interest, $0.2 million for amortization of debt issuance costs, and $2.2 million and $2.0 million , respectively, for amortization of the debt discount. For the nine months ended September 30, 2019 and 2018 , the Company recorded interest expense of $4.6 million for contractual coupon interest, $0.6 million for amortization of debt issuance costs, and $6.6 million and $6.0 million , respectively, for amortization of the debt discount. In connection with the offering, the Company entered into a prepaid forward stock repurchase transaction (Prepaid Forward) with a financial institution (Forward Counterparty). Pursuant to the Prepaid Forward, the Company used approximately $78.0 million of the net proceeds from the offering of the Notes to fund the Prepaid Forward. The aggregate number of shares of the Company’s Class A common stock underlying the Prepaid Forward was approximately 9.2 million . The expiration date for the Prepaid Forward is April 15, 2022, although it may be settled earlier in whole or in part. Upon settlement of the Prepaid Forward, at expiration or upon any early settlement, the Forward Counterparty will deliver to the Company the number of shares of Class A common stock underlying the Prepaid Forward or the portion thereof being settled early. The shares purchased under the Prepaid Forward are treated as treasury stock on the condensed consolidated balance sheet (and not outstanding for purposes of the calculation of basic and diluted income (loss) 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	9 Months Ended
	Sep. 30, 2019
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. Performance stock units (PSUs) granted under the 2014 Plan generally vest over three years based upon continued service and the Company achieving certain revenue targets, and are settled at vesting in shares of the Company’s Class A common stock. The Company accounts for forfeitures of stock-based payment awards in the period they occur. The ESPP allows eligible employees to purchase shares of the Company’s Class A common stock through payroll deductions at a price equal to 85% of the lesser of the fair market value of the stock as of the first date or the ending date of each six-month offering period. For additional information regarding the Company’s equity incentive plans, refer to the 2018 Annual Report. S tock options A summary of the Company’s stock option activity for the nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average Weighted-average remaining contractual term (in years) Aggregate intrinsic value Outstanding at December 31, 2018 5,993 $ 7.28 5.44 $ 7,897 Granted 527 7.42 Exercised (2,159 ) 0.75 Forfeited/Cancelled (225 ) 18.62 Outstanding at September 30, 2019 4,136 $ 10.09 6.99 $ 488 Vested and expected to vest at September 30, 2019 4,136 $ 10.09 6.99 $ 488 Exercisable at September 30, 2019 2,927 $ 11.41 6.19 $ 475 The aggregate intrinsic value of the stock options outstanding as of September 30, 2019 represents the value of the Company’s closing stock price on September 30, 2019 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 nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2018 7,217 $ 8.15 Granted 5,293 5.88 Vested (3,231 ) 8.95 Forfeited (670 ) 7.61 Non-vested shares at September 30, 2019 8,609 $ 6.49 Performance stock units A summary of the Company’s PSU activity for the nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2018 300 $ 5.76 Granted 819 7.51 Forfeited (300 ) 5.76 Non-vested shares at September 30, 2019 819 $ 7.51 Employee stock purchase plan. For the nine months ended September 30, 2019 and 2018 , the Company issued 958,000 and 981,000 shares under its ESPP, respectively, at weighted-average prices of $4.13 and $4.78 , respectively. Stock-based compensation expense. The Company measures compensation expense for all stock-based payment awards based on the estimated fair values on the date of the grant. The fair value of stock options granted and ESPP issuance is estimated using the Black-Scholes option pricing model. The fair value of RSUs and PSUs are determined using the Company’s closing stock price on the date of grant. There have been no significant changes in the Company’s valuation assumptions from those disclosed in its 2018 Annual Report. The following table summarizes stock-based compensation expense included in the condensed consolidated statements of operations: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Cost of revenue $ 448 $ 534 $ 1,483 $ 1,406 Research and development 4,507 4,977 14,068 14,942 Sales and marketing 2,084 2,429 6,518 7,489 General and administrative 2,730 2,397 8,091 7,334 Total stock-based compensation expense $ 9,769 $ 10,337 $ 30,160 $ 31,171 The income tax benefit related to stock-based compensation expense was zero for the three and nine months ended September 30, 2019 and 2018 due to a full valuation allowance on the Company’s United States net deferred tax assets (see Note 7 Income taxes ). At September 30, 2019 , total unearned stock-based compensation of $54.3 million related to stock options, RSUs, PSUs and ESPP shares is expected to be recognized over a weighted-average period of 2.3 years.

Net loss per share

Net loss per share	9 Months Ended
	Sep. 30, 2019
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 September 30, Nine months ended September 30, (in thousands, except per share data) 2019 2018 2019 2018 Numerator: Net loss $ (74,810 ) $ (27,089 ) $ (110,462 ) $ (140,705 ) Denominator: Weighted-average common shares—basic and diluted for Class A and Class B common stock 145,617 140,072 144,306 139,028 Basic and diluted net loss per share $ (0.51 ) $ (0.19 ) $ (0.77 ) $ (1.01 ) 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 September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Anti-dilutive stock-based awards 13,168 15,075 13,064 15,965 The Company has the intent and ability to deliver cash up to the principal amount of the Notes subject to conversion, based on the Company’s current and projected liquidity. As such, no shares associated with the Note conversion were included in the Company’s weighted-average number of common shares outstanding for any periods presented. The Company’s Notes mature on April 15, 2022 , unless earlier repurchased or converted into shares of Class A common stock under certain circumstances as described further in Note 4 Financing Arrangements . The Notes are convertible into cash, shares of the Company’s Class A common stock, or a combination thereof, at the Company’s election. While the Company has the intent and ability to deliver cash up to the principal amount, the maximum number of shares issuable upon conversion of the Notes is 20.6 million shares of Class A common stock. Additionally, the calculation of weighted-average shares outstanding for the three and nine months ended September 30, 2019 and 2018 excludes approximately 9.2 million shares effectively repurchased and held in treasury stock on the condensed consolidated balance sheets as a result of the Prepaid Forward transaction entered into in connection with the Note offering. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Each share of Class B common stock is convertible at any time at the option of the stockholder into one share of Class A common stock and has no expiration date. Each share of Class B common stock will convert automatically into one share of Class A common stock upon the date when the outstanding shares of Class B common stock represent less than 10% of the aggregate number of shares of common stock then outstanding. Class A common stock is not convertible into Class B common stock. The computation of the diluted net loss per share of Class A common stock assumes the conversion of Class B common stock.

Income taxes

Income taxes	9 Months Ended
	Sep. 30, 2019
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. 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 September 30, Nine months ended September 30, (dollars in thousands) 2019 2018 2019 2018 Income tax (benefit) expense $ (273 ) $ 1,780 $ (500 ) $ (296 ) Effective tax rate 0.4 % (7.0 )% 0.5 % 0.2 % The Company recorded an income tax benefit of $0.3 million for the three months ended September 30, 2019 on a pre-tax net loss of $75.1 million , which resulted in an effective tax rate of 0.4% . The Company’s income tax benefit for the three months ended September 30, 2019 was primarily composed of $0.3 million of tax expense incurred on pre-tax income, and discrete items that included a $1.6 million of net non-deductible equity tax expense for employee stock-based compensation, $0.3 million of tax benefit relating to foreign provision to income tax returns adjustments and a $0.4 million tax benefit for other items, partially offset by a net decrease in the valuation allowance of $1.5 million . The Company recorded an income tax benefit of $0.5 million for the nine months ended September 30, 2019 on a pre-tax net loss of $111.0 million , which resulted in an effective tax rate of 0.5% . The Company’s income tax benefit for the nine months ended September 30, 2019 was primarily composed of $1.2 million of tax expense incurred on pre-tax income, and discrete items that included $1.2 million of tax benefit relating to foreign provision to income tax returns adjustments, $0.7 million of net non-deductible equity tax expense for employee stock-based compensation, $0.5 million of tax benefits relating to restructuring charges, and $0.3 million of tax benefits for the release of uncertain tax positions primarily attributable to the expiration of tax statute of limitations, partially offset by a $0.2 million net decrease in the valuation allowance and a $0.2 million tax benefit related to other items. For the three months ended September 30, 2018 , the Company recorded an income tax expense of $1.8 million on a pre-tax net loss of $25.3 million , which resulted in a negative effective tax rate of 7.0% . The Company’s income tax expense for the three months ended September 30, 2018 was composed of $1.5 million of tax expense incurred on pre-tax income in profitable foreign jurisdictions, discrete items that included $7.0 million of net non-deductible equity tax expense, and $0.4 million of tax expense related to foreign provision to return adjustments, partially offset by a $1.1 million tax benefit relating to restructuring expense and a $6.3 million net decrease in the valuation allowance. The Company recorded an income tax benefit of $0.3 million for the nine months ended September 30, 2018 on a pre-tax net loss of $141.0 million , which resulted in an effective tax rate of 0.2% . The Company’s income tax benefit for the nine months ended September 30, 2018 was composed of $2.4 million of tax expenses incurred on pre-tax income in profitable foreign jurisdictions, discrete 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, $9.6 million of net non-deductible equity tax expense, $5.4 million of tax benefit relating to restructuring expenses, $0.6 million of uncertain tax position interest expense and $0.3 million tax expense related to foreign provision to return adjustments, partially offset by a $3.1 million net increase in the valuation allowance. Further, for both 2019 and 2018, while the Company incurred pre-tax losses in the United States, 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 United States deferred tax assets. At September 30, 2019 and December 31, 2018 , the Company’s gross unrecognized tax benefits were $31.5 million and $32.6 million , respectively. If recognized, $17.1 million of these unrecognized tax benefits (net of United States federal benefit) at September 30, 2019 would reduce income tax expense after considering the impact of the change in the valuation allowance in the United States. A material portion of the Company’s gross unrecognized tax benefits, if recognized, would increase the Company’s net operating loss carryforward, which would be offset by a full valuation allowance based on present circumstances. These unrecognized tax benefits relate primarily to unresolved matters with taxing authorities regarding the Company’s transfer pricing positions and tax positions based on the Company’s interpretation of certain United States trial and appellate court decisions, which remain subject to appeal and therefore could be overturned in future periods. Although the completion, settlement and closure of any audits is uncertain, it is reasonably possible that the total amount of unrecognized tax benefits may change in a range of up to $5.0 million 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 be estimated reliably beyond the next 12 months.

Commitments, contingencies and

Commitments, contingencies and guarantees	9 Months Ended
	Sep. 30, 2019
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. The components of net lease cost, which were recorded in operating expenses, were as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 (1) 2018 (2) 2019 (1) 2018 (2) Operating lease cost $ 4,092 $ 3,619 $ 13,656 $ 10,349 Sublease income (129 ) (191 ) (528 ) (570 ) Net lease cost $ 3,963 $ 3,428 $ 13,128 $ 9,779 (1) Operating lease cost includes variable lease costs, which are immaterial. (2) Represents rent expense and sublease income under ASC 840, Leases . Supplemental cash flow information related to leases was as follows: (in thousands) Nine months ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 10,402 Right-of-use assets obtained in exchange for new operating lease liabilities 10,541 Supplemental balance sheet information related to leases was as follows: September 30, 2019 Weighted-average remaining lease term (in years) - operating leases 6.59 Weighted-average discount rate - operating leases 6.3% As of September 30, 2019 , maturities of operating lease liabilities under ASC 842, Leases , were as follows: (in thousands) September 30, 2019 2019 (remaining 3 months) $ 2,611 2020 13,811 2021 12,974 2022 12,426 2023 11,657 Thereafter 35,452 Total lease payments 88,931 Less: Imputed interest (17,259 ) Present value of lease liabilities $ 71,672 As of December 31, 2018 , future minimum lease payments under ASC 840, Leases, were as follows: (in thousands) December 31, 2018 2019 $ 14,845 2020 17,654 2021 17,763 2022 17,552 2023 17,052 Thereafter 22,951 Total lease payments $ 107,817 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 September 30, 2019 , the Company’s total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $195.8 million . 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 Legal Proceedings , of this Quarterly Report on Form 10-Q. Due to inherent uncertainties of litigation, the Company cannot accurately predict the ultimate outcome of these matters. The Company is unable at this time to determine whether the outcome of the litigation would have a material impact on the results of operations, financial condition or cash flows of the Company. Indemnifications. In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. It is not possible to determine the maximum potential amount under these indemnification agreements due to the Company’s limited history with indemnification claims and the unique facts and circumstances involved in each particular agreement. As of September 30, 2019 , 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	9 Months Ended
	Sep. 30, 2019
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: September 30, 2019 December 31, 2018 Customer A * 12% Customer B * 11% * Less than 10% of net accounts receivable for the period indicated. The following table summarizes the Company’s accounts receivables sold, without recourse, and factoring fees paid: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Accounts receivable sold $ 23,804 $ 31,164 $ 78,752 $ 83,618 Factoring fees 423 401 1,121 1,056 Customers who represented 10% or more of the Company’s total revenue were as follows: Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Customer A * 13% 12% 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 . In instances where an outsourcing agreement does not exist or these third parties fail to perform their obligations, the Company may be unable to find alternative partners or satisfactorily deliver its products to its customers on time. Geographic information Revenue by geographic region was as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Americas $ 60,409 $ 120,061 $ 311,750 $ 337,111 Europe, Middle East and Africa (EMEA) 49,387 95,564 203,146 250,016 Asia and Pacific (APAC) 21,373 70,311 151,410 183,832 Total revenue $ 131,169 $ 285,936 $ 666,306 $ 770,959 Revenue in the United States, which is included in the Americas geographic region, was $50.9 million and $93.2 million for the three months ended September 30, 2019 and 2018 , respectively, and $251.6 million and $264.9 million for the nine months ended September 30, 2019 and 2018 , respectively. No other individual country exceeded 10% of total revenue for any period presented. The Company does not disclose revenue by product category as it does not track sales incentives and other revenue adjustments by product category to report such data. As of September 30, 2019 and December 31, 2018 , long-lived assets, which represent net property and equipment, located outside the United States, primarily in Hong Kong and Mainland China, were $13.3 million and $15.9 million

Restructuring charges

Restructuring charges	9 Months Ended
	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring charges	Restructuring charges Restructuring charges for each period were as follows: Nine months ended September 30, (in thousands) 2019 2018 Cost of revenue $ 54 $ 1,357 Research and development 556 12,032 Sales and marketing 314 5,042 General and administrative 501 3,095 Total restructuring charges $ 1,425 $ 21,526 First quarter 2018 restructuring plan On January 2, 2018, the Company approved a restructuring plan to further reduce future operating expenses 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 $17.8 million , including $14.1 million related to severance and $3.7 million related to other charges. The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the first quarter 2018 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ 1,119 $ 399 $ 1,518 Restructuring charges — 3 3 Cash paid (1,095 ) (20 ) (1,115 ) Non-cash reductions (24 ) (250 ) (274 ) Restructuring liability as of September 30, 2019 $ — $ 132 $ 132 First quarter 2017 restructuring plan 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 17% and the consolidation of certain leased office facilities. Under the first quarter 2017 restructuring plan, the Company recorded restructuring charges of $23.1 million , including $10.3 million related to severance, and $12.8 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. The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the first quarter 2017 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ — $ 5,667 $ 5,667 Restructuring charges — 1,395 1,395 Cash paid — (1,082 ) (1,082 ) Non-cash reductions — (335 ) (335 ) Restructuring liability as of September 30, 2019 $ — $ 5,645 $ 5,645 Fourth quarter 2016 restructuring plan 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 $40.0 million , including $36.8 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 substantially completed by March 31, 2017. The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the fourth quarter 2016 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ 299 $ 50 $ 349 Restructuring charges 27 — 27 Cash paid (78 ) — (78 ) Non-cash reductions — (50 ) (50 ) Restructuring liability as of September 30, 2019 $ 248 $ — $ 248

Summary of business and signi_2

Summary of business and significant accounting policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30. The 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, 2018 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, 2018. Except for the accounting policy related to leases that was updated as a result of adopting Accounting Standards Codification (ASC) 842, Leases , there have been no material changes in the Company’s critical accounting policies and estimates from those disclosed in its Annual Report.
Principles of consolidation	Principles of consolidation. These condensed consolidated financial statements include all the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of estimates	Use of estimates. The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s condensed consolidated financial statements and accompanying notes. Significant estimates and assumptions made by management include those related to revenue recognition (including sales incentives, sales returns and implied post contract support), stock-based compensation, inventory valuation, product warranty liabilities, the valuation and useful lives of long-lived assets (property and equipment, operating lease right-of-use assets, 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).
Comparability of Prior Year Financial Data, Policy [Policy Text Block]	Prior period reclassifications. Reclassifications of certain prior period amounts in the condensed consolidated financial statements, including a refinement in methodology for revenue by geography, have been made to conform to the current period presentation.
Lessee, Operating Leases [Text Block]	Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. Beginning January 1, 2019, operating leases are presented in operating lease right-of-use (ROU) assets, short-term operating lease liabilities and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. ROU assets represent the Company’s right to control the use of an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at the lease commencement date based on the present value of future lease payments. The Company determines its incremental borrowing rate based on information available at lease commencement date to calculate the present value of future lease payments. Lease expenses are recognized on a straight-line basis over the lease term. Certain leases include an option to renew with terms that can extend the lease term from one to five years. The exercise of a lease renewal option is at the Company’s sole discretion and is included in the lease term when the Company is reasonably certain it will exercise the option. Prior to January 1, 2019, the Company recognized leases under ASC 840, Leases , which had the following differences from the current lease standard, ASC 842, Leases: • Operating leases were previously not recorded on the Company’s condensed consolidated balance sheets. • The Company calculated a liability for future costs to be incurred under a lease for its remaining term without economic benefit to the Company upon determination of a cease-use date. The fair value of the liability was determined based on remaining lease payments, estimated sublease income and the effects of any prepaid or deferred items recognized under the lease.
Revenue Recognition, Policy [Policy Text Block]	Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, the related implied post contract support to customers, and subscription services. The Company recognizes revenue when control of the promised goods or services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The transaction price the Company expects to be entitled to is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. For most of the Company’s revenue, revenue is recognized at the time products are delivered and when collection is considered probable. For the Company’s subscription services, revenue is recognized on a ratable basis over the subscription term, with payments received in advanced of services being rendered recorded in deferred revenue. 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. The Company's standard terms and conditions of sale for non-web based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated refund liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company’s camera sales contain multiple performance obligations that generally include the following three separate obligations: a) a hardware component (camera) and the embedded firmware essential to the functionality of the hardware component delivered at the time of sale, b) the implicit right to the Company's downloadable free apps and software solutions, and c) the implied right for the customer to receive support after the initial sale (post contract support or PCS). The Company’s PCS includes the right to receive on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, and email and telephone support. The Company allocates the transaction price to PCS based on a cost-plus method. The transaction price 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. The transaction prices allocated to the delivered hardware, related embedded firmware and free software solutions are recognized as revenue at the time of sale, provided the conditions for recognition of revenue have been met. The transaction price allocated to PCS is deferred and recognized as revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Deferred revenue as of September 30, 2019 and December 31, 2018 also included immaterial amounts related to the Company’s GoPro Care and GoPro Plus fee-based service offerings. The Company’s deferred revenue balance was $12.3 million and $16.1 million as of September 30, 2019 and December 31, 2018 , respectively. During the three months ended September 30, 2019 and 2018 , revenue of $5.5 million and $6.1 million , respectively, was recognized that was included in the deferred revenue balances at the beginning of each period. During the nine months ended September 30, 2019 and 2018 , revenue of $12.9 million and $14.6 million , respectively, was recognized that was included in the deferred revenue balances at the beginning of each period.
Sales Incentives [Policy Text Block]	Sales incentives. The Company offers sales incentives through various programs, including cooperative advertising, price protection, marketing development funds and other incentives. Sales incentives are considered to be variable consideration, which the Company estimates and records as a reduction to revenue at the date of sale. The Company estimates sales incentives based on historical experience, product sell-through and other factors.
Segment Reporting, Policy [Policy Text Block]	Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its Chief Executive Officer, who is the Company’s chief operating decision maker.
Schedule of recent accounting pronouncements	Recent accounting standards Standard Description Company’s date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards that were adopted Leases ASU No. 2016-02, 2018-10, 2018-11, 2019-01, (ASC 842) This standard replaces existing lease guidance for lessees and requires operating leases to be recognized on the balance sheet. Under the new standard, lessees recognize a lease liability for the present value of future lease payments and a corresponding right-to-use asset. January 1, 2019 The new standard was applied using a modified retrospective approach. Prior periods were not retrospectively adjusted. The Company completed its analysis of the impact of the standard by reviewing its lease agreements to identify changes resulting from applying the requirements of the new standard. The Company elected to utilize a package of practical expedients, which among other things, allowed the Company to maintain its existing classification of its current leases. The Company also elected the hindsight practical expedient to determine a reasonably certain lease term for existing leases. Additionally, the Company made a policy election to maintain its previous lease accounting for leases with an initial term of 12 months or less. Furthermore, the Company made the policy election to not separate non-lease components from lease components. The Company’s analysis of its lease agreements under the new standard resulted in the recognition of lease liabilities of $88.3 million and lease assets of $60.1 million on its condensed consolidated balance sheet as of January 1, 2019. The new standard did not have a material impact on the Company’s condensed consolidated income statement and condensed consolidated statement of cash flows. The cumulative effect of the changes made to the Company’s condensed consolidated January 1, 2019 balance sheet for the adoption of ASC 842, Leases were as follows: (in thousands) Balance at December 31, 2018 Adjustment due to ASC 842 Balance at January 1, 2019 Operating lease right-of-use assets $ — $ 60,111 $ 60,111 Property and equipment, net (1) 46,567 (57 ) 46,510 Accrued expenses and other current liabilities (2) 135,892 (4,332 ) 131,560 Short-term operating lease liabilities — 10,812 10,812 Long-term operating lease liabilities — 77,545 77,545 Other long-term liabilities (2) 28,203 (23,900 ) 4,303 Accumulated deficit (569,030 ) (61 ) (569,091 ) (1) Represents the reclassification of leasehold acquisition costs to operating lease right-of-use assets. (2) Represents the reclassification of deferred rent, tenant incentives and accrued cease-use charges to operating lease right-of-use assets.
Recent accounting pronouncements	Standard Description Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted Intangible - Goodwill and Other ASU No. 2017-04 (Topic 350) This standard simplifies the accounting for goodwill and removes Step 2 of the annual goodwill impairment test. Upon adoption, goodwill impairment 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 is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017, and requires use of 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. Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments ASU No. 2016-13 (Topic 326) The standard changes the impairment model for most financial assets and replaces the existing incurred loss model with a current expected credit loss (CECL) model. The standard should be applied on a modified retrospective approach. January 1, 2020 The Company’s allowance for doubtful accounts and valuation of available-for-sale securities are subject to this standard. The Company is in the process of quantifying the impact on its condensed consolidated financial statements and related disclosures, but does not expect the impact to be material. The Company will evaluate its available-for-sale securities for impairment under Topic 326 upon adoption of this standard. The Company does not expect the results of its evaluation of available-for-sale securities for impairment to have a material impact on its condensed consolidated financial statements and related disclosures. Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these accounting pronouncements has had or will have a material impact on its condensed consolidated financial statements.

Summary of business and signi_3

Summary of business and significant accounting policies (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Schedule of recent accounting pronouncements	Recent accounting standards Standard Description Company’s date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards that were adopted Leases ASU No. 2016-02, 2018-10, 2018-11, 2019-01, (ASC 842) This standard replaces existing lease guidance for lessees and requires operating leases to be recognized on the balance sheet. Under the new standard, lessees recognize a lease liability for the present value of future lease payments and a corresponding right-to-use asset. January 1, 2019 The new standard was applied using a modified retrospective approach. Prior periods were not retrospectively adjusted. The Company completed its analysis of the impact of the standard by reviewing its lease agreements to identify changes resulting from applying the requirements of the new standard. The Company elected to utilize a package of practical expedients, which among other things, allowed the Company to maintain its existing classification of its current leases. The Company also elected the hindsight practical expedient to determine a reasonably certain lease term for existing leases. Additionally, the Company made a policy election to maintain its previous lease accounting for leases with an initial term of 12 months or less. Furthermore, the Company made the policy election to not separate non-lease components from lease components. The Company’s analysis of its lease agreements under the new standard resulted in the recognition of lease liabilities of $88.3 million and lease assets of $60.1 million on its condensed consolidated balance sheet as of January 1, 2019. The new standard did not have a material impact on the Company’s condensed consolidated income statement and condensed consolidated statement of cash flows. The cumulative effect of the changes made to the Company’s condensed consolidated January 1, 2019 balance sheet for the adoption of ASC 842, Leases were as follows: (in thousands) Balance at December 31, 2018 Adjustment due to ASC 842 Balance at January 1, 2019 Operating lease right-of-use assets $ — $ 60,111 $ 60,111 Property and equipment, net (1) 46,567 (57 ) 46,510 Accrued expenses and other current liabilities (2) 135,892 (4,332 ) 131,560 Short-term operating lease liabilities — 10,812 10,812 Long-term operating lease liabilities — 77,545 77,545 Other long-term liabilities (2) 28,203 (23,900 ) 4,303 Accumulated deficit (569,030 ) (61 ) (569,091 ) (1) Represents the reclassification of leasehold acquisition costs to operating lease right-of-use assets. (2) Represents the reclassification of deferred rent, tenant incentives and accrued cease-use charges to operating lease right-of-use assets.

Fair value measurements (Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2019
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: September 30, 2019 December 31, 2018 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 3,412 $ — $ 3,412 $ 10,901 $ — $ 10,901 Commercial paper — — — 7,577 — 7,577 Total cash equivalents $ 3,412 $ — $ 3,412 $ 18,478 $ — $ 18,478 Marketable securities: U.S. treasury securities $ — $ 8,265 $ 8,265 $ — $ 6,336 $ 6,336 Commercial paper — 7,694 7,694 20,657 — 20,657 Corporate debt securities — 20,001 20,001 — 18,424 18,424 Total marketable securities $ — $ 35,960 $ 35,960 $ 20,657 $ 24,760 $ 45,417 (1) Included in cash and cash equivalents in the accompanying condensed consolidated balance sheets. Cash balances were $39.6 million and $133.6 million as of September 30, 2019 and December 31, 2018 , respectively.

Condensed consolidated financ_2

Condensed consolidated financial statement details (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventory	Inventory (in thousands) September 30, 2019 December 31, 2018 Components $ 32,996 $ 19,205 Finished goods 217,036 97,253 Total inventory $ 250,032 $ 116,458
Property, Plant and Equipment	Property and equipment, net (in thousands) September 30, 2019 December 31, 2018 Leasehold improvements $ 50,709 $ 66,198 Production, engineering and other equipment 45,578 43,019 Tooling 19,190 17,808 Computers and software 21,085 20,865 Furniture and office equipment 10,837 14,969 Tradeshow equipment and other 7,009 7,009 Construction in progress 81 80 Gross property and equipment 154,489 169,948 Less: Accumulated depreciation and amortization (114,762 ) (123,381 ) Property and equipment, net $ 39,727 $ 46,567
Schedule of Finite-Lived Intangible Assets	Intangible assets September 30, 2019 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 50,501 $ (43,405 ) $ 7,096 Domain name 15 — 15 Total intangible assets $ 50,516 $ (43,405 ) $ 7,111 December 31, 2018 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 50,501 $ (37,451 ) $ 13,050 Domain name 15 — 15 Total intangible assets $ 50,516 $ (37,451 ) $ 13,065
Schedule of Future Amortization	(in thousands) Total Year ending December 31, 2019 (remaining 3 months) $ 1,864 2020 4,363 2021 869 2022 — 2023 — $ 7,096
Schedule of Other Assets	Other long-term assets (in thousands) September 30, 2019 December 31, 2018 Point of purchase (POP) displays $ 8,351 $ 9,130 Long-term deferred tax assets 819 945 Deposits and other 7,358 8,120 Other long-term assets $ 16,528 $ 18,195
Schedule of Accrued Liabilities	Accrued expenses and other current liabilities (in thousands) September 30, 2019 December 31, 2018 Accrued sales incentives $ 43,051 $ 40,918 Accrued payables (1) 34,573 34,696 Employee related liabilities (1) 16,520 19,775 Refund liability 5,445 13,100 Warranty liability 9,072 9,604 Inventory received 25,057 5,061 Customer deposits 20,125 3,105 Purchase order commitments 613 2,015 Income taxes payable 1,261 1,948 Other 3,758 5,670 Accrued expenses and other current liabilities $ 159,475 $ 135,892 (1) See Note 10 Restructuring charges for amounts associated with restructuring liabilities.
Schedule of Product Warranty Liability	Product warranty Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance $ 12,850 $ 10,692 $ 10,971 $ 10,373 Charged to cost of revenue 1,610 5,055 12,013 18,163 Settlement of warranty claims (3,981 ) (5,878 ) (12,505 ) (18,667 ) Warranty liability $ 10,479 $ 9,869 $ 10,479 $ 9,869 At September 30, 2019 and December 31, 2018 , $9.1 million and $9.6 million , respectively, of the warranty liability was recorded as an element of accrued expenses and other current liabilities, and $1.4 million

Employee benefit plans (Tables)

Employee benefit plans (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
schedule of share-based compensation, Performance Stock Units Award Activity [Table Text Block]	A summary of the Company’s PSU activity for the nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2018 300 $ 5.76 Granted 819 7.51 Forfeited (300 ) 5.76 Non-vested shares at September 30, 2019 819 $ 7.51
Schedule of Share-based Compensation, Stock Options, Activity	A summary of the Company’s stock option activity for the nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average Weighted-average remaining contractual term (in years) Aggregate intrinsic value Outstanding at December 31, 2018 5,993 $ 7.28 5.44 $ 7,897 Granted 527 7.42 Exercised (2,159 ) 0.75 Forfeited/Cancelled (225 ) 18.62 Outstanding at September 30, 2019 4,136 $ 10.09 6.99 $ 488 Vested and expected to vest at September 30, 2019 4,136 $ 10.09 6.99 $ 488 Exercisable at September 30, 2019 2,927 $ 11.41 6.19 $ 475
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	A summary of the Company’s RSU activity for the nine months ended September 30, 2019 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2018 7,217 $ 8.15 Granted 5,293 5.88 Vested (3,231 ) 8.95 Forfeited (670 ) 7.61 Non-vested shares at September 30, 2019 8,609 $ 6.49
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 September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Cost of revenue $ 448 $ 534 $ 1,483 $ 1,406 Research and development 4,507 4,977 14,068 14,942 Sales and marketing 2,084 2,429 6,518 7,489 General and administrative 2,730 2,397 8,091 7,334 Total stock-based compensation expense $ 9,769 $ 10,337 $ 30,160 $ 31,171

Net loss per share (Tables)

Net loss per share (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, Nine months ended September 30, (in thousands, except per share data) 2019 2018 2019 2018 Numerator: Net loss $ (74,810 ) $ (27,089 ) $ (110,462 ) $ (140,705 ) Denominator: Weighted-average common shares—basic and diluted for Class A and Class B common stock 145,617 140,072 144,306 139,028 Basic and diluted net loss per share $ (0.51 ) $ (0.19 ) $ (0.77 ) $ (1.01 )
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 September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Anti-dilutive stock-based awards 13,168 15,075 13,064 15,965

Income taxes (Tables)

Income taxes (Tables)	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Three months ended September 30, Nine months ended September 30, (dollars in thousands) 2019 2018 2019 2018 Income tax (benefit) expense $ (273 ) $ 1,780 $ (500 ) $ (296 ) Effective tax rate 0.4 % (7.0 )% 0.5 % 0.2 %

Commitments, contingencies an_2

Commitments, contingencies and guarantees (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Components of Lease Expense [Text Block]	The components of net lease cost, which were recorded in operating expenses, were as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 (1) 2018 (2) 2019 (1) 2018 (2) Operating lease cost $ 4,092 $ 3,619 $ 13,656 $ 10,349 Sublease income (129 ) (191 ) (528 ) (570 ) Net lease cost $ 3,963 $ 3,428 $ 13,128 $ 9,779 (1) Operating lease cost includes variable lease costs, which are immaterial. (2) Represents rent expense and sublease income under ASC 840, Leases .
Schedule of Supplemental Cash Flow Information Related To Leases [Text Block]	Supplemental cash flow information related to leases was as follows: (in thousands) Nine months ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 10,402 Right-of-use assets obtained in exchange for new operating lease liabilities 10,541 Supplemental balance sheet information related to leases was as follows: September 30, 2019 Weighted-average remaining lease term (in years) - operating leases 6.59 Weighted-average discount rate - operating leases 6.3%
Schedule of Maturities of Lease Liabilities [Text Block]	As of September 30, 2019 , maturities of operating lease liabilities under ASC 842, Leases , were as follows: (in thousands) September 30, 2019 2019 (remaining 3 months) $ 2,611 2020 13,811 2021 12,974 2022 12,426 2023 11,657 Thereafter 35,452 Total lease payments 88,931 Less: Imputed interest (17,259 ) Present value of lease liabilities $ 71,672
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	As of December 31, 2018 , future minimum lease payments under ASC 840, Leases, were as follows: (in thousands) December 31, 2018 2019 $ 14,845 2020 17,654 2021 17,763 2022 17,552 2023 17,052 Thereafter 22,951 Total lease payments $ 107,817

Concentrations of risk and ge_2

Concentrations of risk and geographic information (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Accounts receivable sold $ 23,804 $ 31,164 $ 78,752 $ 83,618 Factoring fees 423 401 1,121 1,056
Schedule of Revenue by Geographic Region	Revenue by geographic region was as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Americas $ 60,409 $ 120,061 $ 311,750 $ 337,111 Europe, Middle East and Africa (EMEA) 49,387 95,564 203,146 250,016 Asia and Pacific (APAC) 21,373 70,311 151,410 183,832 Total revenue $ 131,169 $ 285,936 $ 666,306 $ 770,959
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: September 30, 2019 December 31, 2018 Customer A * 12% Customer B * 11% * Less than 10% of net accounts receivable for the period indicated.
Sales Revenue [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	Customers who represented 10% or more of the Company’s total revenue were as follows: Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Customer A * 13% 12% 14%

Restructuring charges (Tables)

Restructuring charges (Tables)	9 Months Ended
	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	Restructuring charges for each period were as follows: Nine months ended September 30, (in thousands) 2019 2018 Cost of revenue $ 54 $ 1,357 Research and development 556 12,032 Sales and marketing 314 5,042 General and administrative 501 3,095 Total restructuring charges $ 1,425 $ 21,526
Schedule of Restructuring Reserve by Type of Cost	The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the first quarter 2017 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ — $ 5,667 $ 5,667 Restructuring charges — 1,395 1,395 Cash paid — (1,082 ) (1,082 ) Non-cash reductions — (335 ) (335 ) Restructuring liability as of September 30, 2019 $ — $ 5,645 $ 5,645 The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the first quarter 2018 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ 1,119 $ 399 $ 1,518 Restructuring charges — 3 3 Cash paid (1,095 ) (20 ) (1,115 ) Non-cash reductions (24 ) (250 ) (274 ) Restructuring liability as of September 30, 2019 $ — $ 132 $ 132 The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities on the condensed consolidated balance sheet under the fourth quarter 2016 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2018 $ 299 $ 50 $ 349 Restructuring charges 27 — 27 Cash paid (78 ) — (78 ) Non-cash reductions — (50 ) (50 ) Restructuring liability as of September 30, 2019 $ 248 $ — $ 248

Summary of business and signi_4

Summary of business and significant accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Document Period End Date			Sep. 30, 2019
Accumulated deficit	$ (679,553)		$ (679,553)		$ (569,091)	$ (569,030)
Deferred Revenue	12,300		12,300			16,100
Deferred Revenue, Revenue Recognized	5,500	$ 6,100	12,900	$ 14,600
Accrued expenses and other current liabilities	$ 159,475		$ 159,475		$ 131,560	$ 135,892

Summary of business and signi_5

Summary of business and significant accounting policies New Accounting Pronouncement (Details) - USD ($)	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 52,512,000	$ 60,111,000	$ 0
Property and equipment, net	39,727,000	46,510,000	46,567,000
Accumulated Deficit	(679,553,000)	(569,091,000)	(569,030,000)
Accrued liabilities	159,475,000	131,560,000	135,892,000
Short-term operating lease liabilities	8,890,000	10,812,000	0
Long-term operating lease liabilities	62,554,000	77,545,000	0
Other long-term liabilities	$ 7,973,000	4,303,000	$ 28,203,000
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		60,111,000
Property and equipment, net		(57,000)
Accumulated Deficit		(61,000)
Accrued liabilities		(4,332,000)
Short-term operating lease liabilities		10,812,000
Long-term operating lease liabilities		77,545,000
Other long-term liabilities		$ (23,900,000)

Fair value measurements (Detail

Fair value measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Apr. 12, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	$ 39,600	$ 133,600
Marketable securities	35,960	45,417
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	168,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	3,412	18,478
Marketable securities	35,960	45,417
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	8,265	6,336
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	7,694	20,657
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	20,001	18,424
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	0	7,577
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	3,412	10,901
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	3,412	18,478
Marketable securities	0	20,657
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	0	20,657
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] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	7,577
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	3,412	10,901
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	0
Marketable securities	35,960	24,760
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	8,265	6,336
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	7,694	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	20,001	18,424
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
Convertible Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument			$ 175,000

Condensed consolidated financ_3

Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 35,960	$ 45,417
Cash	39,600	133,600
Cash and cash equivalents	43,016	152,095	$ 143,246	$ 202,504
Fair Value, Measurements, Recurring [Member]
Cash and Cash Equivalents [Line Items]
Marketable securities	$ 35,960	$ 45,417

Condensed consolidated financ_4

Condensed consolidated financial statement details - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 32,996	$ 19,205
Finished goods	217,036	97,253
Total inventory	$ 250,032	$ 116,458

Condensed consolidated financ_5

Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 154,489		$ 169,948
Less: Accumulated depreciation and amortization	(114,762)		(123,381)
Property and equipment, net	39,727	$ 46,510	46,567
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	50,709		66,198
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	45,578		43,019
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	19,190		17,808
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	21,085		20,865
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	10,837		14,969
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	7,009		7,009
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 81		$ 80

Condensed consolidated financ_6

Condensed consolidated financial statement details - Intangible Assets and Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	$ 50,501		$ 50,501		$ 50,501
Accumulated amortization	(43,405)		(43,405)		(37,451)
Net carrying value	7,096		7,096		13,050
Intangible Assets, Gross (Excluding Goodwill)	50,516		50,516		50,516
Intangible assets, net	7,111		7,111		13,065
Indefinite-lived Intangible Assets [Roll Forward]
Amortization of intangible assets	1,900	$ 3,400	6,000	$ 9,400
Goodwill	146,459		146,459		146,459
Indefinite-Lived Trademarks	$ 15		$ 15		$ 15

Condensed consolidated financ_7

Condensed consolidated financial statement details - Future Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2019	$ 1,864
2020	4,363
2021	869
2022	0
2023	0
Net carrying value	$ 7,096	$ 13,050

Condensed consolidated financ_8

Condensed consolidated financial statement details - Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Business Combination, Goodwill [Abstract]
Goodwill	$ 146,459	$ 146,459

Condensed consolidated financ_9

Condensed consolidated financial statement details - Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
POP Displays	$ 8,351	$ 9,130
Long-term deferred tax assets	819	945
Deposits and other	7,358	8,120
Other long-term assets	$ 16,528	$ 18,195

Condensed consolidated finan_10

Condensed consolidated financial statement details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Employee related liabilities	$ 16,520		$ 19,775
Accrued sales incentives	43,051		40,918
Other Accounts Payable and Accrued Liabilities	34,573		34,696
Customer Refund Liability, Current	5,445		13,100
Warranty liability	9,072		9,604
Customer deposits	20,125		3,105
Income taxes payable	1,261		1,948
Purchase Commitment, Remaining Minimum Amount Committed	613		2,015
Inventory received	25,057		5,061
Other	3,758		5,670
Accrued expenses and other current liabilities	$ 159,475	$ 131,560	$ 135,892

Condensed consolidated finan_11

Condensed consolidated financial statement details - Product Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Beginning balances	$ 12,850	$ 10,692	$ 10,971	$ 10,373
Charged to cost of revenue	1,610	5,055	12,013	18,163
Settlements of warranty claims	(3,981)	(5,878)	(12,505)	(18,667)
Ending balances	10,479	$ 9,869	10,479	$ 9,869
Warranty liability	9,072		9,072		$ 9,604
Product Warranty Accrual, Noncurrent	$ 1,400		$ 1,400		$ 1,400

Financing Arrangements (Details

Financing Arrangements (Details) $ / shares in Units, shares in Millions	Apr. 12, 2017USD ($)$ / sharesshares	Mar. 31, 2016USD ($)	Sep. 30, 2019USD ($)shares	Sep. 30, 2018USD ($)shares	Sep. 30, 2019USD ($)shares	Sep. 30, 2018USD ($)shares	Dec. 31, 2018USD ($)
Line of Credit Facility [Line Items]
Document Period End Date					Sep. 30, 2019
Long-term Debt, Percentage Bearing Fixed Interest, Amount	$ 128,300,000
Convertible debt, equity portion	46,700,000
Long-term debt			$ 146,249,000		$ 146,249,000		$ 138,992,000
Amortization of Debt Discount (Premium)					$ 6,633,000	$ 5,988,000
Payments for Repurchase of Equity, Prepaid Forward	$ 78,000,000
Treasury Shares Acquired, Estimated, Prepaid Forward | shares	9.2		9.2	9.2	9.2	9.2
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%
Amount outstanding			$ 0		$ 0		0
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Instrument	$ 175,000,000
Debt Instrument, Unamortized Discount			26,600,000		26,600,000		33,300,000
Interest rate	3.50%
Debt Instrument, Convertible, Conversion Ratio	94.0071
Convertible Debt Principal Amount Conversion	$ 1,000		175,000,000		$ 175,000,000		175,000,000
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			146,200,000		$ 146,200,000		139,000,000
Interest Expense, Debt			1,500,000	$ 1,500,000	4,600,000	$ 4,600,000
Amortization of Debt Issuance Costs			200,000	200,000	600,000	600,000
Amortization of Debt Discount (Premium)			2,200,000	$ 2,000,000	6,600,000	$ 6,000,000
Long-term Debt [Member] | Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross	4,200,000
Debt Issuance Costs, Net			$ 2,100,000		$ 2,100,000		$ 2,700,000
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) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 9,769	$ 10,606	$ 9,782	$ 11,335	$ 10,008	$ 10,797
ESPP stock issued during period (shares)							958,000	981,000
ESPP weighted average purchase price of shares purchased (usd per share)							$ 4.13	$ 4.78
Unearned stock-based compensation, expected recognition period							2 years 3 months 18 days
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 0			$ 0			$ 0	$ 0
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							5,293,000
Weighted average price of shares granted (usd per share)							$ 5.88
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							819,000
Weighted average price of shares granted (usd per share)							$ 7.51
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	$ 54,300						$ 54,300
2014 Equity Incentive Plans [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration Period	10 years
2014 Equity Incentive Plans [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	3 years
2014 Equity Incentive Plans [Member] | Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	1 year
2014 Equity Incentive Plans [Member] | Minimum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	2 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years
2014 Equity Incentive Plans [Member] | Maximum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period	4 years

Employee benefit plans - Stock

Employee benefit plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Shares (in thousands)
Outstanding at beginning of period (shares)	5,993
Granted (shares)	527
Exercised (shares)	(2,159)
Forfeited/Cancelled (shares)	(225)
Outstanding at end of period (shares)	4,136	5,993
Weighted-average exercise price
Outstanding at beginning of period (in dollars per share)	$ 7.28
Granted (usd per share)	7.42
Exercised (usd per share)	0.75
Outstanding at end of period (in dollars per share)	$ 10.09	$ 7.28
Weighted Average Remaining Contractual Term (in years)	6 years 11 months 26 days	5 years 5 months 8 days
Aggregate intrinsic value (in thousands)	$ 488	$ 7,897
Vested and Expected to Vest (shares)	4,136
Vested and Expected to Vest - Weighted Average Exercise Price (in dollars per share)	$ 10.09
Vested and Expected to Vest- Weighted Average Remaining Contractual Term	6 years 11 months 26 days
Vested and Expected to Vest - Aggregate Intrinsic Value	$ 488
Exercisable (shares)	2,927
Exercisable - Weighted average exercise price (in dollars per share)	$ 11.41
Exercisable - Weighted Average Remaining Contractual Term	6 years 2 months 8 days
Exercisable - Aggregate intrinsic value	$ 475
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 18.62

Employee benefit plans - Restri

Employee benefit plans - Restricted Stock Units Activity (Details) - RSUs [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Shares (in thousands)
Non-vested shares at beginning of period (shares) | shares	7,217
Granted (shares) | shares	5,293
Vested (shares) | shares	(3,231)
Forfeited (shares) | shares	(670)
Non-vested shares at end of period (shares) | shares	8,609
Weighted-average grant date fair value
Non-vested shares at beginning of period (in dollars per share) | $ / shares	$ 8.15
Weighted average price of shares granted (usd per share) | $ / shares	5.88
Weighted average price of shares vested (usd per share) | $ / shares	8.95
Weighted average price of shares forfeited (usd per share) | $ / shares	7.61
Non-vested shares at end of period (in dollars per share) | $ / shares	$ 6.49

Employee benefit plans - Alloca

Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 9,769	$ 10,337	$ 30,160	$ 31,171
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	0	0	0	0
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	448	534	1,483	1,406
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	4,507	4,977	14,068	14,942
Selling and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	2,084	2,429	6,518	7,489
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 2,730	$ 2,397	$ 8,091	$ 7,334

Employee benefit plans Performa

Employee benefit plans Performance Stock Units activity (Details) - Performance Shares [Member] - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (shares)	819	300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 7.51	$ 5.76
Granted (shares)	819
Weighted average price of shares granted (usd per share)	$ 7.51
Forfeited (shares)	(300)
Weighted average price of shares forfeited (usd per share)	$ 5.76

Net loss per share Additional I

Net loss per share Additional Information (Details) - USD ($) $ in Millions	Apr. 12, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Document Period End Date				Sep. 30, 2019
Treasury Shares Acquired, Estimated, Prepaid Forward	9,200,000	9,200,000	9,200,000	9,200,000	9,200,000
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number				1
Conversion of Stock, Shares Issued				1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number				10
Convertible Debt [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument	$ 175
Interest rate	3.50%
Maximum number of shares issuable upon conversion of the notes	20,600,000

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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss	$ (74,810)	$ (11,287)	$ (24,365)	$ (27,089)	$ (37,269)	$ (76,347)	$ (110,462)	$ (140,705)
Denominator:
Weighted-average common shares—basic for Class A and Class B common stock (shares)	145,617			140,072			144,306	139,028
Earnings Per Share, Basic and Diluted	$ (0.51)			$ (0.19)			$ (0.77)	$ (1.01)

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	13,168	15,075	13,064	15,965

Income taxes Income Taxes (Deta

Income taxes Income Taxes (Details) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (75,083)	$ (25,309)	$ (110,962)	$ (141,001)
Income tax (benefit) expense	$ 273	$ (1,780)	$ 500	$ 296
Effective Income Tax Rate Reconciliation, Percent	0.40%	(7.00%)	0.50%	0.20%

Income taxes - Income Tax Expen

Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (273)	$ 1,780	$ (500)	$ (296)
Effective Income Tax Rate Reconciliation, Percent	0.40%	(7.00%)	0.50%	0.20%

Income taxes - Unrecognized Inc

Income taxes - Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	$ 0.3	$ 10.9
Reconciliation of Unrecognized Tax Benefits
Unrecognized Tax Benefits, beginning balance	32.6
Unrecognized Tax Benefits, ending balance	$ 31.5

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Loss before income taxes	$ (75,083)	$ (25,309)	$ (110,962)	$ (141,001)
Effective Income Tax Rate Reconciliation, Percent	0.40%	(7.00%)	0.50%	0.20%
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions			$ 300	$ 10,900
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 1,500	$ 6,300	200	3,100
Income tax (benefit) expense	(273)	1,780	$ (500)	(296)
Document Period End Date			Sep. 30, 2019
Current Foreign Tax Expense (Benefit)	300	1,500	$ 1,200	2,400
Tax Adjustments, Settlements, and Unusual Provisions	300	400	1,200
Income Tax Effects Allocated Directly to Equity, Other	1,600	7,000	700	9,600
Other Tax Expense (Benefit)	400		200	300
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions				600
Unrecognized tax benefits	31,500		31,500		$ 32,600
Unrecognized tax benefits that would impact effective tax rate	17,100		17,100
Increase in Unrecognized Tax Benefits is Reasonably Possible	$ 5,000		5,000
Restructuring Charges [Member]
Operating Loss Carryforwards [Line Items]
Other Tax Expense (Benefit)		$ 1,100	$ 500	$ 5,400

Commitments, contingencies an_3

Commitments, contingencies and guarantees - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Long-term Purchase Commitment [Line Items]
Operating Lease, Cost	$ 4,092	$ 3,619	$ 13,656	$ 10,349
Operating Lease, Payments			$ 10,402
Document Period End Date			Sep. 30, 2019
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	2,611		$ 2,611
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	13,811		13,811
Lessee, Operating Lease, Liability, Payments, Due Year Two	12,974		12,974
Lessee, Operating Lease, Liability, Payments, Due Year Three	12,426		12,426
Lessee, Operating Lease, Liability, Payments, Due Year Five	11,657		11,657
Lessee, Operating Lease, Liability, Payments, Due after Year Five	35,452		35,452
Operating Leases,Total lease payments	88,931		88,931
us-gaap_Lessee Operating Lease Liability Undiscounted Excess Amount	17,259		17,259
Operating Leases, Future Minimum Payments Due, Next Twelve Months					$ 14,845
Operating Leases, Future Minimum Payments, Due in Two Years					17,654
Operating Leases, Future Minimum Payments, Due in Three Years					17,763
Operating Leases, Future Minimum Payments, Due in Four Years					17,552
Operating Leases, Future Minimum Payments, Due in Five Years					17,052
Operating Leases, Future Minimum Payments, Due Thereafter					22,951
Operating Leases, Future Minimum Payments Due					$ 107,817
Other Commitment	$ 195,800		195,800
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			$ 10,541
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months 2 days		6 years 7 months 2 days
Operating Lease, Weighted Average Discount Rate, Percent	6.30%		6.30%
Operating Lease, Liability	$ 71,672		$ 71,672
Sublease Income	(129)	(191)	(528)	(570)
Lease, Cost	$ 3,963	$ 3,428	$ 13,128	$ 9,779

Concentrations of risk and ge_3

Concentrations of risk and geographic information - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Revenue	$ 131,169	$ 285,936	$ 666,306	$ 770,959
Document Period End Date			Sep. 30, 2019
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	50,900	$ 93,200	$ 251,600	$ 264,900
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 13,300		$ 13,300		$ 15,900

Concentrations of risk and ge_4

Concentrations of risk and geographic information - Schedule of Customer Concentration by Risk Factor (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Concentration Risk [Line Items]
Document Period End Date			Sep. 30, 2019
Accounts receivable sold	$ 23,804	$ 31,164	$ 78,752	$ 83,618
Factoring fees	$ 423	$ 401	$ 1,121	$ 1,056
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk					12.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [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		13.00%	12.00%	14.00%

Concentrations of risk and ge_5

Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 131,169	$ 285,936	$ 666,306	$ 770,959
United States [Member]
Segment Reporting Information [Line Items]
Revenue	50,900	93,200	251,600	264,900
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	60,409	120,061	311,750	337,111
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	49,387	95,564	203,146	250,016
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 21,373	$ 70,311	$ 151,410	$ 183,832

Restructuring charges - Restruc

Restructuring charges - Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,425	$ 21,526
Cost of Revenue [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			54	1,357
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			556	12,032
Selling and Marketing Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			314	5,042
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			501	$ 3,095
First quarter 2018 restructuring [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 17,800
Restructuring charges			3
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 23,100
Restructuring charges			$ 1,395
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12,800

Restructuring charges (Details)

Restructuring charges (Details) - USD ($) $ in Thousands	Jan. 02, 2018	Mar. 15, 2017	Nov. 29, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges							$ 1,425	$ 21,526
First quarter 2018 restructuring [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	18.00%
Restructuring charges				$ 17,800
Other Restructuring Costs				3,700			3
First quarter 2018 restructuring [Member] [Domain] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs				$ 14,100			0
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated		17.00%
Restructuring charges					$ 23,100
Other Restructuring Costs							1,395
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					12,800
First quarter 2017 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs					$ 10,300		0
Fourth quarter 2016 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated			15.00%
Restructuring charges						$ 40,000
Other Restructuring Costs							$ 0
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]
Severance Costs						$ 36,800

Restructuring charges - Restr_2

Restructuring charges - Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Non-cash settlements					$ (5,788)
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs				$ 1,395
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				5,667
Restructuring charges				1,395
Cash paid				(1,082)
Non-cash settlements				(335)
Restructuring liability as of December 31, 2017				5,645
First quarter 2017 restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs		$ 10,300		0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				0
Cash paid				0
Non-cash settlements				0
Restructuring liability as of December 31, 2017				0
First quarter 2017 restructuring [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				5,667
Cash paid				(1,082)
Non-cash settlements				(335)
Restructuring liability as of December 31, 2017				5,645
Fourth quarter 2016 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs				0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				349
Restructuring charges				27
Cash paid				(78)
Non-cash settlements				(50)
Restructuring liability as of December 31, 2017				248
Fourth quarter 2016 restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs			$ 36,800
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				299
Restructuring charges				27
Cash paid				(78)
Non-cash settlements				0
Restructuring liability as of December 31, 2017				248
Fourth quarter 2016 restructuring [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				50
Cash paid				0
Non-cash settlements				(50)
Restructuring liability as of December 31, 2017				0
First quarter 2018 restructuring [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	$ 3,700			3
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				1,518
Restructuring charges				3
Cash paid				(1,115)
Non-cash settlements				(274)
Restructuring liability as of December 31, 2017				132
First quarter 2018 restructuring [Member] [Domain] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 14,100			0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				1,119
Cash paid				(1,095)
Non-cash settlements				(24)
Restructuring liability as of December 31, 2017				0
First quarter 2018 restructuring [Member] [Domain] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016				399
Cash paid				(20)
Non-cash settlements				(250)
Restructuring liability as of December 31, 2017				$ 132