GoPro (GPRO) 10-Q 4 Nov 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Nov. 01, 2021
Class of Stock [Line Items]
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0629474
Entity Address, Address Line One	3025 Clearview Way
Entity Address, City or Town	San Mateo,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94402
Title of 12(b) Security	Class A common stock, $0.0001 par value
Trading Symbol	GPRO
Entity Registrant Name	GOPRO, INC.
City Area Code	(650)
Local Phone Number	332-7600
Entity Central Index Key	0001500435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-36514
Document Fiscal Year Focus	2021
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
Document Quarterly Report	true
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		128,937,145
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		27,058,546

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 296,357,000	$ 325,654,000
Marketable securities	82,184,000	0
Accounts receivable, net	98,832,000	107,244,000
Inventory	120,891,000	97,914,000
Prepaid expenses and other current assets	44,830,000	23,872,000
Total current assets	643,094,000	556,684,000
Property and equipment, net	20,409,000	23,711,000
Operating Lease, Right-of-Use Asset	27,762,000	31,560,000
Intangible assets, net	133,000	1,214,000
Goodwill	146,459,000	146,459,000
Other long-term assets	280,390,000	11,771,000
Total assets	1,118,247,000	771,399,000
Current liabilities:
Accounts payable	118,876,000	111,399,000
Accrued expenses and other current liabilities	112,480,000	113,776,000
Short-term operating lease liabilities	9,542,000	9,369,000
Deferred revenue	34,400,000	28,149,000
Short-term Bank Loans and Notes Payable	120,213,000	0
Total current liabilities	395,511,000	262,693,000
Long-term taxes payable	6,353,000	18,099,000
Long-term debt	109,470,000	218,172,000
Long-term operating lease liabilities	45,138,000	51,986,000
Other long-term liabilities	6,780,000	4,431,000
Total liabilities	563,252,000	555,381,000
Commitments, contingencies and guarantees
Stockholders’ equity:
Preferred Stock, Value, Outstanding	0	0
Common Stocks, Including Additional Paid in Capital	1,000,579,000	980,147,000
Treasury Stock, Value	(113,613,000)	(113,613,000)
Accumulated deficit	(331,971,000)	(650,516,000)
Total stockholders’ equity	554,995,000	216,018,000
Total liabilities and stockholders’ equity	$ 1,118,247,000	$ 771,399,000
Preferred Stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)	5,000,000	5,000,000
Preferred Stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Treasury Stock, Value	$ 113,613,000	$ 113,613,000
Common Stocks, Including Additional Paid in Capital	1,000,579,000	980,147,000
Preferred Stock, Value, Outstanding	$ 0	$ 0
Treasury Stock, Shares (shares)	10,710,000	10,710,000
Restricted Cash	$ 0	$ 2,000,000
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 outstanding (shares)	128,697,000	122,233,000
Common Stock, Shares Authorized (shares)	500,000,000	500,000,000
Common Stock, Shares, Issued	128,697,000	122,233,000
Common Stock, Shares Authorized (shares)	500,000,000	500,000,000
Common Stock, Shares, Issued	128,697,000	122,233,000
Common Class B [Member]
Common stock outstanding (shares)	27,259,000	28,885,000
Common Stock, Shares Authorized (shares)	150,000,000	150,000,000
Common Stock, Shares, Issued	27,259,000	28,885,000
Common Stock, Shares Authorized (shares)	150,000,000	150,000,000
Common Stock, Shares, Issued	27,259,000	28,885,000

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Preferred Stock, par value (usd per share)		$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized (shares)		5,000,000	5,000,000
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	500,000,000
Common Stock, Shares, Issued	128,700,000	128,697,000	122,233,000
Common stock outstanding (shares)		128,697,000	122,233,000
Common Class B [Member]
Common Stock, Shares Authorized (shares)	150,000,000	150,000,000	150,000,000
Common Stock, Shares, Issued	27,300,000	27,259,000	28,885,000
Common stock outstanding (shares)	27,300,000	27,259,000	28,885,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 316,669,000	$ 280,507,000	$ 769,935,000	$ 534,153,000
Cost of revenue	178,616,000	181,195,000	453,904,000	355,722,000
Gross profit	138,053,000	99,312,000	316,031,000	178,431,000
Operating expenses:
Research and development	36,458,000	37,235,000	106,688,000	104,074,000
Sales and marketing	37,352,000	34,378,000	108,812,000	112,845,000
General and administrative	15,642,000	18,845,000	45,940,000	53,686,000
Total operating expenses	89,452,000	90,458,000	261,440,000	270,605,000
Operating income (loss)	48,601,000	8,854,000	54,591,000	(92,174,000)
Interest expense	(5,748,000)	(5,260,000)	(17,160,000)	(14,774,000)
Other Nonoperating Expense	1,320,000
Other income (expense), net		955,000	435,000	462,000
Total other expense, net	(7,068,000)	(4,305,000)	(16,725,000)	(14,312,000)
Income (loss) before income taxes	41,533,000	4,549,000	37,866,000	(106,486,000)
Income tax expense (benefit)	(270,228,000)	1,242,000	(280,679,000)	4,710,000
Net income (loss)	$ 311,761,000	$ 3,307,000	$ 318,545,000	$ (111,196,000)
Earnings Per Share, Basic	$ 2.01	$ 0.02	$ 2.07	$ (0.75)
Earnings Per Share, Diluted	$ 1.92	$ 0.02	$ 1.96	$ (0.75)
Weighted Average Number of Shares Outstanding, Basic	155,009	149,406	153,618	148,491
Weighted Average Number of Shares Outstanding, Diluted	162,746	151,849	162,728	148,491

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 318,545,000	$ (111,196,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	8,598,000	15,495,000
Amortization of Leased Asset	3,798,000	4,907,000
Stock-based compensation	28,227,000	21,926,000
Deferred income taxes	(269,922,000)	(51,000)
Restructuring Costs	(99,000)	(5,242,000)
Operating Lease, Impairment Loss	0	12,460,000
Amortization of Debt Discount (Premium)	10,535,000	7,348,000
Other	874,000	738,000
Changes in operating assets and liabilities:
Accounts receivable, net	7,426,000	93,240,000
Inventory	(22,977,000)	11,420,000
Prepaid expenses and other assets	(18,617,000)	3,613,000
Accounts payable and other liabilities	(10,362,000)	(81,325,000)
Deferred revenue	9,279,000	3,712,000
Net Cash Provided by (Used in) Operating Activities	65,305,000	(12,471,000)
Investing activities:
Purchases of property and equipment, net	(4,840,000)	(4,560,000)
Purchases of marketable securities	(82,270,000)	0
Maturities of marketable securities	0	14,830,000
Payments for (Proceeds from) Other Investing Activities	0	438,000
Net cash provided by (used in) investing activities	(87,110,000)	9,832,000
Financing activities:
Proceeds from issuance of common stock	7,225,000	3,508,000
Payment, Tax Withholding, Share-based Payment Arrangement	(15,013,000)	(4,713,000)
Proceeds from Lines of Credit	0	30,000,000
Repayments of Lines of Credit	0	(30,000,000)
Net cash used in financing activities	(7,788,000)	(1,205,000)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(1,704,000)	414,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(31,297,000)	(3,430,000)
Cash, cash equivalents and restricted cash at beginning of period	325,654,000
Cash, cash equivalents and restricted cash at end of period	$ 296,357,000	$ 146,871,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements Stockholders' Equity (Deficit) - 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, 2019	$ 233,529	$ 930,875	$ (113,613)	$ (583,733)
Beginning Balance (shares) at Dec. 31, 2019		146,818
Common stock issued under employee benefit plans, net of shares withheld for tax	1,863	$ 1,863
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2,003)	$ 2,003
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,542
Allocated share-based compensation expense	7,637	$ 7,637
Net income (loss)	(63,528)			(63,528)
Ending Balance at Mar. 31, 2020	177,498	$ 938,372	(113,613)	(647,261)
Ending Balance (shares) at Mar. 31, 2020		148,360
Beginning Balance at Dec. 31, 2019	233,529	$ 930,875	(113,613)	(583,733)
Beginning Balance (shares) at Dec. 31, 2019		146,818
Net income (loss)	(111,196)
Ending Balance at Sep. 30, 2020	143,097	$ 951,639	(113,613)	(694,929)
Ending Balance (shares) at Sep. 30, 2020		150,224
Beginning Balance at Mar. 31, 2020	177,498	$ 938,372	(113,613)	(647,261)
Beginning Balance (shares) at Mar. 31, 2020		148,360
Common stock issued under employee benefit plans, net of shares withheld for tax	30	$ 30
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(351)	$ 351
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		278
Allocated share-based compensation expense	5,876	$ 5,876
Net income (loss)	(50,975)			(50,975)
Ending Balance at Jun. 30, 2020	132,078	$ 943,927	(113,613)	(698,236)
Ending Balance (shares) at Jun. 30, 2020		148,638
Common stock issued under employee benefit plans, net of shares withheld for tax	1,658	$ 1,658
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(2,359)	$ 2,359
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,586
Allocated share-based compensation expense	8,413	$ 8,413
Net income (loss)	3,307			3,307
Ending Balance at Sep. 30, 2020	143,097	$ 951,639	(113,613)	(694,929)
Ending Balance (shares) at Sep. 30, 2020		150,224
Beginning Balance at Dec. 31, 2020	216,018	$ 980,147	(113,613)	(650,516)
Beginning Balance (shares) at Dec. 31, 2020		151,119
Common stock issued under employee benefit plans, net of shares withheld for tax	2,998	$ 2,998
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(6,246)	$ 6,246
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		2,214
Allocated share-based compensation expense	8,869	$ 8,869
Net income (loss)	(10,168)			(10,168)
Ending Balance at Mar. 31, 2021	211,471	$ 985,768	(113,613)	(660,684)
Ending Balance (shares) at Mar. 31, 2021		153,333
Beginning Balance at Dec. 31, 2020	216,018	$ 980,147	(113,613)	(650,516)
Beginning Balance (shares) at Dec. 31, 2020		151,119
Net income (loss)	318,545
Ending Balance at Sep. 30, 2021	554,995	$ 1,000,579	(113,613)	(331,971)
Ending Balance (shares) at Sep. 30, 2021		155,956
Beginning Balance at Mar. 31, 2021	211,471	$ 985,768	(113,613)	(660,684)
Beginning Balance (shares) at Mar. 31, 2021		153,333
Common stock issued under employee benefit plans, net of shares withheld for tax	1,442	$ 1,442
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(1,729)	$ 1,729
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		717
Allocated share-based compensation expense	10,029	$ 10,029
Net income (loss)	16,952			16,952
Ending Balance at Jun. 30, 2021	238,165	$ 995,510	(113,613)	(643,732)
Ending Balance (shares) at Jun. 30, 2021		154,050
Adjustments to Additional Paid in Capital, Capped Call Option, Issuance Costs	(10,200)
Common stock issued under employee benefit plans, net of shares withheld for tax	2,780	$ 2,780
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(7,040)	$ 7,040
Common stock issued under employee benefit plans, net of shares withheld for tax (shares)		1,906
Allocated share-based compensation expense	9,329	$ 9,329
Net income (loss)	311,761			311,761
Ending Balance at Sep. 30, 2021	$ 554,995	$ 1,000,579	$ (113,613)	$ (331,971)
Ending Balance (shares) at Sep. 30, 2021		155,956

Summary of business and signifi

Summary of business and significant accounting policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Summary of business and significant accounting policies	Summary of business and significant accounting policies GoPro, Inc. and its subsidiaries (GoPro or the Company) make it easy for the world to capture and share itself in immersive and exciting ways, helping people get the most out of their photos and videos. The Company is committed to developing solutions that create an easy, seamless experience for consumers to capture, create, manage and share engaging personal content. To date, the Company’s cameras, mountable and wearable accessories, and subscription services have generated substantially all of its revenue. The Company sells its products globally on its website, and through retailers and wholesale distributors. The Company’s global corporate headquarters are located in San Mateo, California. Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30. The Company’s operating results, financial position and cash flows for fiscal year 2020 were negatively impacted by the COVID-19 pandemic. As the global impact of the pandemic began to emerge in the first quarter of 2020, the Company accelerated a shift in its sales channel strategy to focus more on direct-to-consumer sales through GoPro.com, and implemented a restructuring plan in April 2020, which primarily impacted the Company’s global workforce, sales and marketing expenses, and leased facilities. These actions were reflected in the Company’s financial results starting in the second quarter of 2020 by reducing on-going operating expenses and helped accelerate its ability to achieve profitability in the second half of 2020. In 2020, the Company also issued additional convertible senior notes and entered into a new credit facility. 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 any other future period. The Condensed Consolidated Balance Sheet at December 31, 2020 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, 2020. 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 and the allocation of the transaction price (including sales incentives, sales returns and implied post contract support), inventory valuation, product warranty liabilities, the valuation, impairment and useful lives of long-lived assets (property and equipment, operating lease right-of-use assets, intangible assets and goodwill), fair value of convertible senior notes, 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, including but not limited to the potential impacts arising from the COVID-19 pandemic, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The extent and continued impact of COVID-19 has been taken into account by management in making the significant assumptions and estimates related to the above; however, if the duration and spread of the outbreak, the impact on our customers, and the effect on our contract manufacturers, vendors and supply chain is different from the Company’s estimates and assumptions, then actual results could differ materially. Given the uncertainty with respect to COVID-19, the Company’s estimates and assumptions may evolve as conditions change. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected. Comprehensive income (loss). For all periods presented, comprehensive income (loss) approximated net income (loss). Therefore, the Condensed Consolidated Statements of Comprehensive Income (Loss) have been omitted. Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, subscription and services and implied post contract support to customers. The transaction price recognized as revenue represents the amount the Company expects to be entitled to and is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. The Company’s camera sales contain multiple performance obligations that can include four separate obligations: a) a camera hardware component (which may be bundled with hardware accessories) and the embedded firmware essential to the functionality of the camera component delivered at the time of sale, b) the implicit right to the Company’s downloadable free apps and software solutions, c) the implied right for the customer to receive post contract support after the initial sale (PCS), and d) a subscription service. 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, chat and telephone support. The Company allocates a portion of the transaction price to the PCS performance obligation based on a cost-plus methodology and recognizes the associated revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 24 months based on historical experience. The transaction price allocated to subscription services is based on the standalone selling price and is recognized ratably over the subscription term, with payments received in advance of services being rendered recorded in deferred revenue. The transaction price is allocated to the remaining performance obligations on a residual value methodology. The transaction price 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 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, market trends in the pricing for similar offerings and the standalone selling price. The Company's standard terms and conditions of sale for non-web-based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated return liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. For customers who purchase products directly from GoPro.com, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred. Deferred revenue as of September 30, 2021 and December 31, 2020 also included amounts related to the Company’s subscription services. The Company’s short-term and long-term deferred revenue balances totaled $38.5 million and $29.3 million as of September 30, 2021 and December 31, 2020, respectively. Of the deferred revenue balance as of December 31, 2020 and 2019, the Company recognized $6.6 million and $3.2 million of revenue during the three months ended September 30, 2021 and 2020, respectively, and $24.6 million and $12.9 million of revenue during the nine months ended September 30, 2021 and 2020, respectively. Of the deferred revenue balance as of June 30, 2021 and 2020, the Company recognized $13.8 million and $5.6 million of revenue during the three months ended September 30, 2021 and 2020, respectively. 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 Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) ASU No. 2020-06 This standard simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible debt instruments and contracts on an entity’s own equity. Specifically, the standard removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments, requiring bifurcation only if the convertible debt feature qualifies as a derivative under ASC 815 or if the convertible debt was issued at a substantial premium. This standard also removes certain settlement conditions required for equity contracts to qualify for the derivative scope exception. Lastly, entities are required to use the if-converted method for convertible instruments in the diluted earnings per share calculation. Early adoption is permitted, but no earlier than the fiscal year beginning after December 15, 2020. The standard can be applied using a full or modified retrospective approach. January 1, 2022 Upon adoption, the Company expects a decrease to additional paid in capital, an increase in the carrying value of its convertible notes and an increase to retained earnings. After adoption, the Company expects a reduction in its reported interest expense and the Company expects to reverse the deferred tax consequences originally recognized. Additionally, the Company expects the use of the if-converted method for calculating diluted earnings per share will result in an increase in weighted-average shares outstanding. The Company will continue to evaluate the effect that the adoption of this standard will have on its financial statements. 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, 2021
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, 2021 December 31, 2020 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 139,110 $ — $ 139,110 $ 19,445 $ — $ 19,445 Total cash equivalents $ 139,110 $ — $ 139,110 $ 19,445 $ — $ 19,445 Marketable securities: Commercial paper $ — $ 55,436 $ 55,436 $ — $ — $ — Corporate debt securities — 26,748 26,748 — — — Total marketable securities $ — $ 82,184 $ 82,184 $ — $ — $ — (1) Included in cash and cash equivalents in the accompanying Condensed Consolidated Balance Sheets. Cash balances were $157.2 million as of September 30, 2021 and $308.2 million, including $2.0 million of restricted cash, as of December 31, 2020. Cash equivalents are classified as Level 1 because the Company uses quoted market prices to determine their fair value. Marketable securities are classified as Level 2 because the Company uses 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, 2021 were all less than one year in duration. At September 30, 2021 and December 31, 2020, the Company had no financial assets or liabilities measured at fair value on a recurring basis that were classified as Level 3, which are valued based on inputs supported by little or no market activity. At September 30, 2021 and December 31, 2020, 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 (2022 Notes). In November 2020, the Company issued $143.8 million principal amount of Convertible Senior Notes due 2025 (2025 Notes) (see Note 4 Financing arrangements). The estimated fair value of the 2022 Notes and 2025 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 2022 Notes and 2025 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 2022 Notes was $133.3 million and $146.0 million as of September 30, 2021 and December 31, 2020, respectively, while the calculated fair value of the 2025 Notes was $182.0 million and $166.8 million as of September 30, 2021 and December 31, 2020, respectively. The calculated fair value 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 2022 Notes and 2025 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. The Company also measures certain non-financial assets at fair value on a nonrecurring basis, primarily goodwill, intangible assets and operating lease right-of-use assets, in connection with periodic evaluations for potential impairment.

Condensed consolidated financia

Condensed consolidated financial statement details	9 Months Ended
	Sep. 30, 2021
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, 2021 December 31, 2020 Components $ 10,372 $ 13,229 Finished goods 110,519 84,685 Total inventory $ 120,891 $ 97,914 Property and equipment, net (in thousands) September 30, 2021 December 31, 2020 Leasehold improvements $ 33,772 $ 35,180 Production, engineering and other equipment 45,594 48,908 Tooling 16,899 17,635 Computers and software 22,554 22,385 Furniture and office equipment 5,618 6,315 Tradeshow equipment and other 1,970 5,860 Construction in progress 102 22 Gross property and equipment 126,509 136,305 Less: Accumulated depreciation and amortization (106,100) (112,594) Property and equipment, net $ 20,409 $ 23,711 Intangible assets September 30, 2021 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 51,066 $ (50,948) $ 118 Domain name 15 — 15 Total intangible assets $ 51,081 $ (50,948) $ 133 December 31, 2020 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 51,066 $ (49,867) $ 1,199 Domain name 15 — 15 Total intangible assets $ 51,081 $ (49,867) $ 1,214 Amortization expense was $0.1 million and $1.0 million for the three months ended September 30, 2021 and 2020, respectively, and $1.1 million and $3.9 million for the nine months ended September 30, 2021 and 2020, respectively. At September 30, 2021, expected amortization expense of intangible assets with definite lives for future periods was as follows: (in thousands) Total Year ending December 31, 2021 (remaining 3 months) $ 71 2022 47 $ 118 Other long-term assets (in thousands) September 30, 2021 December 31, 2020 Point of purchase (POP) displays $ 2,399 $ 3,612 Long-term deferred tax assets 270,819 966 Deposits and other 7,172 7,193 Other long-term assets $ 280,390 $ 11,771 Accrued expenses and other current liabilities (in thousands) September 30, 2021 December 31, 2020 Accrued liabilities $ 33,295 $ 39,444 Accrued sales incentives 24,958 30,609 Employee related liabilities 8,937 7,067 Return liability 10,266 10,817 Warranty liability 7,446 7,997 Inventory received 10,274 1,709 Customer deposits 5,976 2,347 Purchase order commitments 914 1,921 Income taxes payable 188 221 Other 10,226 11,644 Accrued expenses and other current liabilities $ 112,480 $ 113,776 Product warranty Three months ended September 30, Nine months ended September 30, (in thousands) 2021 2020 2021 2020 Beginning balance $ 7,621 $ 7,326 $ 8,523 $ 11,398 Charged to cost of revenue 4,560 4,560 11,329 7,546 Settlement of warranty claims (4,272) (4,269) (11,943) (11,327) Warranty liability $ 7,909 $ 7,617 $ 7,909 $ 7,617 At September 30, 2021 and December 31, 2020, $7.4 million and $8.0 million, respectively, of the warranty liability was recorded as a component of accrued expenses and other current liabilities, and $0.5 million was recorded as a component of other long-term liabilities for both periods.

Financing Arrangements

Financing Arrangements	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Financing Arrangements	Financing arrangements 2021 Credit Facility In January 2021, the Company entered into a Credit Agreement (2021 Credit Agreement) which provides for a revolving credit facility (2021 Credit Facility) under which the Company may borrow up to an aggregate amount of $50.0 million. The 2021 Credit Facility will terminate and any outstanding borrowings become due and payable on the earlier of (i) January 2024 and (ii) unless the Company has cash in a specified deposit account in an amount equal to or greater than the amount required to repay the Company’s convertible notes due April 2022, 91 days prior to the maturity date of such convertible notes. Concurrently with the execution of the 2021 Credit Agreement in January 2021, the Company terminated its previous 2016 Credit Agreement, which would otherwise have matured in March 2021. The amount that may be borrowed under the 2021 Credit Agreement may be based on a customary borrowing base calculation if the Company’s Asset Coverage Ratio is at any time less than 1.50. The Asset Coverage Ratio is defined as the ratio of (i) the sum of (a) the Company’s cash and cash equivalents in the United States plus specified percentages of other qualified debt investments (Qualified Cash) plus (b) specified percentages of the net book values of the Company’s accounts receivable and certain inventory to (ii) $50.0 million. At the Company’s option, borrowed funds accrue interest at either (i) a floating rate per annum equal to the base rate plus a margin of from 0.50% to 1.00% depending on the Company’s Asset Coverage Ratio or (ii) a per annum rate equal to the rate at which dollar deposits are offered in the London interbank market plus a margin of from 1.50% to 2.00% depending on the Company’s Asset Coverage Ratio. The Company is required to pay a commitment fee on the unused portion of the 2021 Credit Facility of 0.375% to 0.50% per annum, based on the level of utilization of the 2021 Credit Facility. Amounts owed under the 2021 Credit Agreement are guaranteed by certain of the Company’s United States subsidiaries and secured by a first priority security interest in substantially all of the assets of the Company and certain of its subsidiaries (other than intellectual property, which is subject to a negative pledge restricting grants of security interests to third parties). The 2021 Credit Agreement contains customary representations, warranties, and affirmative and negative covenants. The negative covenants include restrictions on the incurrence of liens and indebtedness, certain investments, dividends, stock repurchases and other matters, all subject to certain exceptions. In addition, the Company is required to maintain Liquidity (the sum of unused availability under the credit facility and the Company’s Qualified Cash) of at least $55.0 million (of which at least $40.0 million shall be attributable to Qualified Cash), or, if the borrowing base is then in effect, minimum unused availability under the credit facility of at least $10.0 million. The 2021 Credit Agreement also includes customary events of default that include, among other things, non-payment of principal, interest or fees, inaccuracy of representations and warranties, violation of certain covenants, cross default to certain other indebtedness, bankruptcy and insolvency events, material judgments and change of control. Upon an event of default, the lender may, subject to customary cure rights, require the immediate payment of all amounts outstanding. At September 30, 2021, the Company was in compliance with all financial covenant contained in the 2021 Credit Agreement. The Company has made no borrowings from the 2021 Credit Facility to date. 2022 Convertible Notes In April 2017, the Company issued $175.0 million aggregate principal amount of 3.50% Convertible Senior Notes due 2022 (2022 Notes). The 2022 Notes are senior, unsecured obligations of GoPro and mature on April 15, 2022, unless earlier repurchased or converted into shares of Class A common stock under certain circumstances. The 2022 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 2022 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 2022 Notes then outstanding upon conversion. The Company pays interest on the 2022 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 2022 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 Sheets. 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 2022 Notes. The liability component will be accreted up to the face value of the 2022 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 2022 Notes’ maturity date. The accretion of the 2022 Notes to par and debt issuance cost recorded to long-term debt is amortized into interest expense over the term of the 2022 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 2022 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 Sheets are being amortized over the five-year contractual term of the 2022 Notes using the effective interest method. The Company may not redeem the 2022 Notes prior to the maturity date and no sinking fund is provided for the 2022 Notes. The indenture includes customary terms and covenants, including certain events of default after which the 2022 Notes may be due and payable immediately. Holders have the option to convert the 2022 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 2022 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 2022 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 2022 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 2022 Notes on April 15, 2022, a holder may convert its 2022 Notes, in multiples of $1,000 principal amount. Holders of the 2022 Notes who convert their 2022 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 2022 Notes at a repurchase price equal to 100% of the principal amount of the 2022 Notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the repurchase date. During the three months ended September 30, 2021, the conditions allowing holders of the 2022 Notes to convert were not met. Concurrently with the November 2020 issuance of the 2025 Notes, the Company used $56.2 million of the net cash proceeds from the 2025 Notes to repurchase $50.0 million principal amount of the 2022 Notes through an individual, privately negotiated transaction. The $56.2 million net cash proceeds were allocated between long-term debt (liability component) of $50.6 million and additional paid-in capital (equity component) of $5.4 million on the Condensed Consolidated Balance Sheets, and the remaining $0.2 million was related to the payment of interest. The fair value of the liability component was measured using rates determined for similar debt instrument without a conversion feature. The Company’s effective interest rate of 2.4% was based on the trading details of the 2022 Notes immediately prior to the repurchase date to determine the volatility of the 2022 Notes, and their remaining term. The cash consideration allocated to the equity component was calculated by deducting the fair value of the liability component and interest payment from the total aggregate cash consideration. The difference between the fair value of the 2022 Notes repurchased and the carrying value of $45.2 million resulted in a $5.4 million loss on extinguishment of debt. As of September 30, 2021 and December 31, 2020, the outstanding principal on the 2022 Notes was $125.0 million, the unamortized debt discount was $4.5 million and $10.2 million, respectively, the unamortized debt issuance cost was $0.3 million and $0.8 million, respectively, and the net carrying amount of the liability component was $120.2 million and $114.0 million, respectively, which was recorded as short-term debt and long-term debt, respectively, within the Condensed Consolidated Balance Sheets. For the three months ended September 30, 2021 and 2020, the Company recorded interest expense of $1.1 million and $1.5 million, respectively, for contractual coupon interest, $0.1 million and $0.2 million for amortization of debt issuance costs, respectively, and $2.0 million and $2.4 million, respectively, for amortization of the debt discount. For the nine months ended September 30, 2021 and 2020, the Company recorded interest expense of $3.3 million and $4.6 million, respectively, for contractual coupon interest, $0.4 million and $0.6 million, respectively, for amortization of debt issuance costs, and $5.8 million and $7.3 million, respectively, for amortization of the debt discount. In connection with the 2022 Notes 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 2022 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 Sheets (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. In the fourth quarter of 2020, 8.8 million shares out of the 9.2 million shares of Class A common stock underlying the Prepaid Forward entered into as part of the Company’s 2022 Notes were early settled and delivered to the Company. In April 2021, the remaining 0.4 million shares of Class A common stock underlying the Prepaid Forward were early settled and delivered to the Company. There was no financial statement impact due to the return of shares; however, shares outstanding for corporate law purposes are reduced by the early settlements. 2025 Convertible Notes In November 2020, the Company issued $125.0 million aggregate principal amount of 1.25% Convertible Senior Notes due 2025 and granted an option to the initial purchasers to purchase up to an additional $18.8 million aggregate principal amount of the 2025 Notes to cover over-allotments, of which $18.8 million was subsequently exercised during November 2020, resulting in a total issuance of $143.8 million aggregate principal amount of the 2025 Notes. The 2025 Notes are senior, unsecured obligations of GoPro and mature on November 15, 2025, unless earlier repurchased or converted into shares of Class A common stock under certain circumstances. The 2025 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 107.1984 shares of Class A common stock per $1,000 principal amount of the 2025 Notes, which is equivalent to an initial conversion price of approximately $9.3285 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 2025 Notes then outstanding upon conversion. The Company pays interest on the 2025 Notes semi-annually in arrears on May 15 and November 15 of each year. The $143.8 million of proceeds received from the issuance of the 2025 Notes were allocated between long-term debt (liability component) of $106.9 million and additional paid-in-capital (equity component) of $36.9 million on the Condensed Consolidated Balance Sheets. 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 2025 Notes. The liability component will be accreted up to the face value of the 2025 Notes of $143.8 million, which will result in additional non-cash interest expense being recognized in the Condensed Consolidated Statements of Operations through the 2025 Notes’ maturity date. The accretion of the 2025 Notes to par and debt issuance cost recorded to long-term debt is amortized into interest expense over the term of the 2025 Note using an effective interest rate of approximately 7.5%. The equity component will not be remeasured as long as it continues to meet the conditions for equity classification. The Company incurred approximately $4.7 million of issuance costs related to the issuance of the 2025 Notes, of which $3.5 million and $1.2 million were recorded to long-term debt and additional paid-in capital, respectively. The $3.5 million of issuance costs recorded as long-term debt on the Condensed Consolidated Balance Sheets are being amortized over the five-year contractual term of the 2025 Notes using the effective interest method. The Company may redeem all or any portion of the 2025 Notes on or after November 20, 2023 for cash if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides the redemption notice, at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus accrued interest and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the 2025 Notes. The indenture includes customary terms and covenants, including certain events of default after which the 2025 Notes may be due and payable immediately. Holders have the option to convert the 2025 Notes in multiples of $1,000 principal amount at any time prior to August 15, 2025, but only in the following circumstances: • during any calendar quarter beginning after the calendar quarter ending on March 31, 2021, 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 2025 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 2025 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 2025 Notes on each such trading day; • if the Company calls any or all of the 2025 Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately before the redemption date; or • upon the occurrence of specified corporate events. At any time on or after August 15, 2025 until the second scheduled trading day immediately preceding the maturity date of the 2025 Notes on November 15, 2025, a holder may convert its 2025 Notes, in multiples of $1,000 principal amount. Holders of the 2025 Notes who convert their 2025 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 2025 Notes at a repurchase price equal to 100% of the principal amount of the 2025 Notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the repurchase date. During the three months ended September 30, 2021, the conditions allowing holders of the 2025 Notes to convert were not met. As of September 30, 2021 and December 31, 2020, the outstanding principal on the 2025 Notes was $143.8 million, the unamortized debt discount was $31.4 million and $36.1 million, respectively, the unamortized debt issuance cost was $2.9 million and $3.4 million, respectively, and the net carrying amount of the liability component was $109.5 million and $104.2 million, respectively, which was recorded as long-term debt within the Condensed Consolidated Balance Sheets. For the three months ended September 30, 2021, the Company recorded interest expense of $0.4 million for contractual coupon interest , $0.2 million for amortization of debt issuance costs, and $1.6 million for amortization of the debt discount. For the nine months ended September 30, 2021, the Company recorded interest expense of $1.3 million for contractual coupon interest , $0.6 million for amortization of debt issuance costs, and $4.7 million for amortization of the debt discount. In connection with the offering of the 2025 Notes, the Company paid $10.2 million to enter into privately negotiated capped call transactions with certain financial institutions (Capped Calls). The Capped Calls have an initial strike price of $9.3285 per share, which corresponds to the initial conversion price of the 2025 Notes. The Capped Calls cover, subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the 2025 Notes, the number of Class A common stock initially underlying the 2025 Notes. The Capped Calls are generally expected to reduce potential dilution to the Company’s Class A common stock upon any conversion of the 2025 Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of converted 2025 Notes, as the case may be, with such reduction and/or offset subject to a cap, initially equal to $12.0925, and is subject to certain adjustments under the terms of the Capped Call transactions. The Capped Calls will expire in November 2025, if not exercised earlier. The Capped Calls are subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, tender offers and announcement events. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings and hedging disruptions. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the 2025 Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders’ equity as a reduction to additional paid-in capital and will not be remeasured as long as they

Stockholders' equity

Stockholders' equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders’ equity Common stock. The Company has two classes of authorized common stock: Class A common stock with 500 million shares authorized and Class B common stock with 150 million shares authorized. As of September 30, 2021, 128.7 million shares of Class A stock were issued and outstanding and 27.3 million shares of Class B stock were issued and outstanding. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting power and conversion rights. 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. The Class B common stock is also convertible into Class A common stock on the same basis upon any transfer, whether or not for value, except for “permitted transfers” as defined in the Company’s restated certificate of incorporation. 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. As of September 30, 2021, the Class B stock continued to represent greater than 10% of the overall outstanding shares. The Company had the following shares of common stock reserved for issuance upon the exercise of equity instruments as of September 30, 2021: (in thousands) September 30, 2021 Stock options outstanding 3,431 Restricted stock units outstanding 10,639 Performance stock units outstanding 1,319 Common stock available for future grants 32,795 Total common stock shares reserved for issuance 48,184

Employee benefit plans

Employee benefit plans	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Employee benefit plans	Employee benefit plans Equity incentive plans . The Company has outstanding equity grants from its three stock-based employee compensation plans: the 2014 Equity Incentive Plan (2014 Plan), the 2010 Equity Incentive Plan (2010 Plan) and the 2014 Employee Stock Purchase Plan (ESPP). No new options or awards have been granted under the 2010 Plan since June 2014. Outstanding options and awards under the 2010 Plan continue to be subject to the terms and conditions of the 2010 Plan. Options granted under the 2014 Plan generally expire within ten years from the date of grant and generally vest over one two S tock options A summary of the Company’s stock option activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average exercise price Weighted-average remaining contractual term (in years) Aggregate intrinsic value (in thousands) Outstanding at December 31, 2020 3,431 $ 8.79 6.50 $ 6,259 Granted 309 7.97 Exercised (548) 5.31 Forfeited/Cancelled (58) 18.90 Outstanding at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Vested and expected to vest at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Exercisable at September 30, 2021 2,074 $ 10.90 5.01 $ 2,930 The aggregate intrinsic value of the stock options outstanding as of September 30, 2021 represents the value of the Company’s closing stock price on September 30, 2021 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, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 10,639 $ 5.04 Granted 3,698 8.35 Vested (4,590) 5.29 Forfeited (821) 5.67 Non-vested shares at September 30, 2021 8,926 $ 6.22 Performance stock units A summary of the Company’s PSU activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 1,319 $ 4.48 Granted 573 7.93 Vested (532) 4.69 Forfeited (288) 4.05 Non-vested shares at September 30, 2021 1,072 $ 6.34 Employee stock purchase plan. For the nine months ended September 30, 2021 and 2020, the Company issued 0.8 million and 1.0 million shares under its ESPP, respectively, at weighted-average prices of $5.28 and $3.42, 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 2020 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) 2021 2020 2021 2020 Cost of revenue $ 483 $ 340 $ 1,420 $ 1,175 Research and development 4,380 3,597 13,131 9,682 Sales and marketing 1,950 1,601 5,968 4,107 General and administrative 2,516 2,875 7,708 6,962 Total stock-based compensation expense $ 9,329 $ 8,413 $ 28,227 $ 21,926 At September 30, 2021, total unearned stock-based compensation of $52.4 million related to stock options, RSUs, PSUs and ESPP shares is expected to be recognized over a weighted-average period of 1.98 years.

Net loss per share

Net loss per share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Net loss per share	Net income (loss) per share The following table presents the calculations of basic and diluted net income (loss) per share: Three months ended September 30, Nine months ended September 30, (in thousands, except per share data) 2021 2020 2021 2020 Numerator: Net income (loss) $ 311,761 $ 3,307 $ 318,545 $ (111,196) Denominator: Weighted-average common shares - basic for Class A and Class B common stock 155,009 149,406 153,618 148,491 Effect of dilutive securities 7,737 2,443 9,110 — Weighted-average common shares - diluted for Class A and Class B common stock 162,746 151,849 162,728 148,491 Net income (loss) per share Basic $ 2.01 $ 0.02 $ 2.07 $ (0.75) Diluted $ 1.92 $ 0.02 $ 1.96 $ (0.75) 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) 2021 2020 2021 2020 Stock-based awards 1,772 10,598 1,682 14,652 The Company has the intent and ability to deliver cash up to the principal amount of the 2022 Notes and 2025 Notes subject to conversion, based on the Company’s projected liquidity levels. The Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread is dilutive in periods of net income when the average market price of the Company’s Class A common stock for a given reporting period exceeds the initial conversion prices of $10.64 and $9.3285 per share for the 2022 Notes and 2025 Notes, respectively. For the three and nine months ended September 30, 2021, only the conversion spread relating to the 2025 Notes had a dilutive effect on net income per share. The initial conversion price of the 2022 Notes was greater than the average market price of the Company’s Class A Common Stock for the three and nine months ended September 30, 2021, and as such, had no impact on anti-dilutive or dilutive share calculations. Upon conversion of the 2025 Notes, there will be no economic dilution until the average market price of the Company’s Class A common stock exceeds the cap price of $12.0925 per share, as exercise of the Capped Calls offset any dilution from the 2025 Notes from the initial conversion price up to the cap price. The Capped Calls are excluded from diluted net income per share as they would be anti-dilutive under the treasury stock method. The Company’s 2022 Notes mature on April 15, 2022 and the 2025 Notes mature on November 15, 2025, unless earlier repurchased or converted into shares of Class A common stock under certain circumstances as described further in Note 4 Financing arrangements. The 2022 Notes and 2025 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 2022 Notes is 20.6 million shares of Class A common stock and 20.8 million shares of Class A common stock upon conversion of the 2025 Notes. Additionally, the calculation of weighted-average shares outstanding for the three and nine months ended September 30, 2021 and 2020 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 2022 Note offering.

Commitments, contingencies and

Commitments, contingencies and guarantees	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Operating lease cost (1) $ 2,797 $ 3,352 $ 8,785 $ 11,647 Sublease income — (133) (333) (393) Right-of-use asset impairment cost — 12,460 — 12,460 Net lease cost $ 2,797 $ 15,679 $ 8,452 $ 23,714 (1) Operating lease cost includes variable lease costs, which are immaterial. Supplemental cash flow information related to leases was as follows: Nine months ended September 30, (in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 11,167 $ 10,869 Right-of-use assets obtained in exchange for operating lease liabilities 1,314 1,252 Operating lease modifications to decrease right-of-use assets — (2,482) Supplemental balance sheet information related to leases was as follows: September 30, 2021 December 31, 2020 Weighted-average remaining lease term (in years) - operating leases 4.90 5.53 Weighted-average discount rate - operating leases 6.1% 6.2% As of September 30, 2021, maturities of operating lease liabilities were as follows: (in thousands) September 30, 2021 2021 (remaining 3 months) $ 2,047 2022 13,555 2023 12,192 2024 11,686 2025 11,477 Thereafter 12,684 Total lease payments 63,641 Less: Imputed interest (9,416) Present value of lease liabilities $ 54,225 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, 2021, the Company’s total undiscounted future expected obligations under multi-year agreements described above with terms longer than one year was $353.5 million. Legal proceedings and investigations. On February 13, 2018 and February 27, 2018, two purported shareholder derivative lawsuits (the Consolidated Federal Derivative Actions) were filed in the United States District Court for the Northern District of California against certain of GoPro’s current and former directors and executive officers and naming the Company as a nominal defendant. The Consolidated Federal Derivative Actions assert causes of action against the individual defendants for breach of fiduciary duty, and for making false and misleading statements about the Company’s business, operations and prospects in violation of Sections 10(b) and 14(a) of the Securities Exchange Act of 1934. The plaintiffs seek corporate reforms, disgorgement of profits from stock sales, and fees and costs. Different shareholders filed two similar purported shareholder derivative actions on October 30, 2018 and November 7, 2018 in the Delaware Court of Chancery (the Consolidated Delaware Derivative Actions). On April 28, 2020, the Delaware Court of Chancery granted defendants’ motion to dismiss the Consolidated Delaware Derivative Action complaint with prejudice (the “April 28 Order”). Plaintiffs filed a notice of appeal of the April 28 Order to the Delaware Supreme Court on May 8, 2020. On August 3, 2021, pursuant to the terms of the Settlement described below, the parties filed a stipulation dismissing the appeal, which the Delaware Supreme Court entered on August 4, 2021. Other shareholders filed similar purported shareholder derivative actions on December 26, 2018, February 15, 2019, and January 27, 2020 in the Delaware Court of Chancery (the Non-Consolidated Delaware Actions). Following settlement negotiations, an agreement in principle to settle all derivative claims on behalf of the Company (the Settlement) was reached by plaintiffs in the Consolidated Federal Derivative Actions, the Consolidated Delaware Derivative Actions, certain other plaintiffs (the Settling Plaintiffs), and the current and former executive officers and members of the Company’s Board. On February 9, 2021, the Settling Plaintiffs filed a motion for preliminary approval of the Settlement in the Consolidated Federal Derivative Actions, and the court preliminarily approved the Settlement on April 1, 2021. On July 28, 2021, the court entered an order granting final approval of the Settlement and judgment was entered the same day (the “Final Order and Judgment”). Following entry of the Final Order and Judgment, two of the Non-Consolidated Delaware Actions were dismissed with prejudice on August 10, 2021, with the remaining Non-Consolidated Delaware Action dismissed with prejudice on August 31, 2021. The Settlement is not expected to have a material impact on the Company’s condensed consolidated financial statements. On January 5, 2015, Contour LLC filed a complaint against the Company in federal court in Utah alleging, among other things, patent infringement in relation to certain GoPro cameras. GoPro filed an inter partes review (IPR) at the United States Patent and Trademark Office. On November 30, 2015, Contour dismissed the Utah action, and Contour IP Holdings LLC (CIPH), a non-practicing entity, re-filed a similar complaint in Delaware. The case was transferred to the Northern District of California in July 2017 (case 3:17-cv-04738) and was stayed pending the IPR proceedings. Upon conclusion of the IPRs, the District Court lifted the stay on October 1, 2019. Due to COVID-19 delays, the trial was delayed several times. Separately, on March 26, 2021, CIPH filed a new lawsuit against Company in the same court (case 3:21-cv-02143), asserting the same patents against certain GoPro products. On May 6, 2021, the Court consolidated the two cases, and trial is set to commence on May 4, 2022. The Company believes that the matters lack merit, and intends to vigorously defend against CIPH. The Company regularly evaluates the associated developments of the legal proceedings described above, as well as other legal proceedings that arise in the ordinary course of business. While litigation is inherently uncertain, based on the currently available information, the Company is unable to determine a loss or a range of loss, and does not believe the ultimate cost to resolve these matters will have a material adverse effect on its business, financial condition, cash flows or results of operations. Indemnifications. The Company has entered into indemnification agreements with its directors and executive officers which requires the Company to indemnify its directors and executive officers against liabilities that may arise by reason of their status or service. In addition, 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, 2021, 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, 2021
Risks and Uncertainties [Abstract]
Concentrations of risk and segment information	Concentrations of risk and geographic information Concentration of risk. Financial instruments which potentially subject the Company to concentration of credit risk includes cash and cash equivalents, restricted cash, marketable securities, accounts receivable, and derivative instruments, including the Capped Calls associated with the 2025 Notes. The Company places cash and cash equivalents with high-credit-quality financial institutions; however, the Company maintains cash balances in excess of the FDIC insurance limits. 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. The Company believes its counterparty credit risk related to its derivative instruments is mitigated by transacting with major financial institutions with high credit ratings. Customers who represented 10% or more of the Company’s net accounts receivable balance were as follows: September 30, 2021 December 31, 2020 Customer A 18% 23% Customer B 31% 15% Customer C * 12% * 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) 2021 2020 2021 2020 Accounts receivable sold $ 39,231 $ 30,832 $ 73,867 $ 66,393 Factoring fees 130 247 345 433 Third-party 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, 2021 2020 2021 2020 Customer A 13% 13% 12% 25% Customer B * * * 10 Customer C * * * 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) 2021 2020 2021 2020 Americas $ 160,875 $ 157,720 $ 414,113 $ 297,607 Europe, Middle East and Africa (EMEA) 85,791 64,563 196,784 129,191 Asia and Pacific (APAC) 70,003 58,224 159,038 107,355 Total revenue $ 316,669 $ 280,507 $ 769,935 $ 534,153

Subsequent Events

Subsequent Events	1 Months Ended
	Nov. 04, 2021
Subsequent Event [Line Items]
Subsequent Events [Text Block]	10. Subsequent events In October 2021 the Company entered into a fully executed and consented sublease agreement for certain buildings on its headquarters campus, which were previously vacated in the prior year as part of the Company’s 2020 Restructuring Plan. The sublease term will extend through December 2026, which is commensurate with the original lease term. The total subleased space is 78,408 square feet, which includes a 3% annual rate increase and common area maintenance (“CAM”) fees and property taxes reimbursed by the sublessee. We are expecting cash inflows from this agreement of approximately$20.0 million starting in the second quarter of 2022.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	9 Months Ended
	Sep. 30, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	VALUATION AND QUALIFYING ACCOUNTS For the year ended December 31, 2021, 2020 and 2019 (in thousands) Balance at Beginning of Year Charges to Revenue Charges (Benefits) to Expense Charges to Other Accounts - Equity Deductions/Write-offs Balance at End of Year Allowance for doubtful accounts receivable: Year ended September 30, 2021 $ 830 $ — $ (24) $ — $ (314) $ 492 Year ended September 30, 2020 500 — 616 — (286) 830 Year ended December 31, 2019 750 — 199 — (449) 500 Valuation allowance for deferred tax assets: Year ended September 30, 2021 $ 277,693 $ — $ 16,762 $ (7,179) $ — $ 287,276 Year ended September 30, 2020 271,374 — 4,717 1,602 — 277,693 Year ended December 31, 2019 226,458 — 42,772 2,144 — 271,374

Summary of business and signi_2

Summary of business and significant accounting policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (GAAP). The Company’s fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30 and September 30. The Company’s operating results, financial position and cash flows for fiscal year 2020 were negatively impacted by the COVID-19 pandemic. As the global impact of the pandemic began to emerge in the first quarter of 2020, the Company accelerated a shift in its sales channel strategy to focus more on direct-to-consumer sales through GoPro.com, and implemented a restructuring plan in April 2020, which primarily impacted the Company’s global workforce, sales and marketing expenses, and leased facilities. These actions were reflected in the Company’s financial results starting in the second quarter of 2020 by reducing on-going operating expenses and helped accelerate its ability to achieve profitability in the second half of 2020. In 2020, the Company also issued additional convertible senior notes and entered into a new credit facility. 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 any other future period. The Condensed Consolidated Balance Sheet at December 31, 2020 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, 2020. 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 and the allocation of the transaction price (including sales incentives, sales returns and implied post contract support), inventory valuation, product warranty liabilities, the valuation, impairment and useful lives of long-lived assets (property and equipment, operating lease right-of-use assets, intangible assets and goodwill), fair value of convertible senior notes, 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, including but not limited to the potential impacts arising from the COVID-19 pandemic, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. The extent and continued impact of COVID-19 has been taken into account by management in making the significant assumptions and estimates related to the above; however, if the duration and spread of the outbreak, the impact on our customers, and the effect on our contract manufacturers, vendors and supply chain is different from the Company’s estimates and assumptions, then actual results could differ materially. Given the uncertainty with respect to COVID-19, the Company’s estimates and assumptions may evolve as conditions change. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected.
Comprehensive income (loss)	Comprehensive income (loss).
Revenue recognition	Revenue recognition. The Company derives substantially all of its revenue from the sale of cameras, mounts and accessories, subscription and services and implied post contract support to customers. The transaction price recognized as revenue represents the amount the Company expects to be entitled to and is primarily comprised of product revenue, net of returns and variable consideration, including sales incentives provided to customers. The Company’s camera sales contain multiple performance obligations that can include four separate obligations: a) a camera hardware component (which may be bundled with hardware accessories) and the embedded firmware essential to the functionality of the camera component delivered at the time of sale, b) the implicit right to the Company’s downloadable free apps and software solutions, c) the implied right for the customer to receive post contract support after the initial sale (PCS), and d) a subscription service. 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, chat and telephone support. The Company allocates a portion of the transaction price to the PCS performance obligation based on a cost-plus methodology and recognizes the associated revenue on a straight-line basis over the estimated term of the support period, which is estimated to be 24 months based on historical experience. The transaction price allocated to subscription services is based on the standalone selling price and is recognized ratably over the subscription term, with payments received in advance of services being rendered recorded in deferred revenue. The transaction price is allocated to the remaining performance obligations on a residual value methodology. The transaction price 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 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, market trends in the pricing for similar offerings and the standalone selling price. The Company's standard terms and conditions of sale for non-web-based sales do not allow for product returns other than under warranty. However, the Company grants limited rights of return, primarily to certain large retailers. The Company reduces revenue and cost of sales for the estimated returns based on analyses of historical return trends by customer class and other factors. An estimated return liability along with a right to recover assets are recorded for future product returns. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. For customers who purchase products directly from GoPro.com, the Company retains a portion of the risk of loss on these sales during transit, which are accounted for as fulfillment costs. The Company provides sales commissions to internal and external sales representatives which are earned in the period in which revenue is recognized. As a result, the Company expenses such costs as incurred. Deferred revenue as of September 30, 2021 and December 31, 2020 also included amounts related to the Company’s subscription services. The Company’s short-term and long-term deferred revenue balances totaled $38.5 million and $29.3 million as of September 30, 2021 and December 31, 2020, respectively. Of the deferred revenue balance as of December 31, 2020 and 2019, the Company recognized $6.6 million and $3.2 million of revenue during the three months ended September 30, 2021 and 2020, respectively, and $24.6 million and $12.9 million of revenue during the nine months ended September 30, 2021 and 2020, respectively. Of the deferred revenue balance as of June 30, 2021 and 2020, the Company recognized $13.8 million and $5.6 million of revenue during the three months ended September 30, 2021 and 2020, respectively.
Revenue Recognition, Incentives	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
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 two S tock options A summary of the Company’s stock option activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average exercise price Weighted-average remaining contractual term (in years) Aggregate intrinsic value (in thousands) Outstanding at December 31, 2020 3,431 $ 8.79 6.50 $ 6,259 Granted 309 7.97 Exercised (548) 5.31 Forfeited/Cancelled (58) 18.90 Outstanding at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Vested and expected to vest at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Exercisable at September 30, 2021 2,074 $ 10.90 5.01 $ 2,930 The aggregate intrinsic value of the stock options outstanding as of September 30, 2021 represents the value of the Company’s closing stock price on September 30, 2021 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, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 10,639 $ 5.04 Granted 3,698 8.35 Vested (4,590) 5.29 Forfeited (821) 5.67 Non-vested shares at September 30, 2021 8,926 $ 6.22 Performance stock units A summary of the Company’s PSU activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 1,319 $ 4.48 Granted 573 7.93 Vested (532) 4.69 Forfeited (288) 4.05 Non-vested shares at September 30, 2021 1,072 $ 6.34 Employee stock purchase plan. For the nine months ended September 30, 2021 and 2020, the Company issued 0.8 million and 1.0 million shares under its ESPP, respectively, at weighted-average prices of $5.28 and $3.42, 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 2020 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) 2021 2020 2021 2020 Cost of revenue $ 483 $ 340 $ 1,420 $ 1,175 Research and development 4,380 3,597 13,131 9,682 Sales and marketing 1,950 1,601 5,968 4,107 General and administrative 2,516 2,875 7,708 6,962 Total stock-based compensation expense $ 9,329 $ 8,413 $ 28,227 $ 21,926 At September 30, 2021, total unearned stock-based compensation of $52.4 million related to stock options, RSUs, PSUs and ESPP shares is expected to be recognized over a weighted-average period of 1.98 years.
Segment information	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.

Compensation Related Costs, Sha

Compensation Related Costs, Share Based Payments (Policies)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement	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) 2021 2020 2021 2020 Cost of revenue $ 483 $ 340 $ 1,420 $ 1,175 Research and development 4,380 3,597 13,131 9,682 Sales and marketing 1,950 1,601 5,968 4,107 General and administrative 2,516 2,875 7,708 6,962 Total stock-based compensation expense $ 9,329 $ 8,413 $ 28,227 $ 21,926

Summary of business and signi_3

Summary of business and significant accounting policies (Tables)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Schedule of recent accounting pronouncements	Recent accounting standards Standard Description Expected date of adoption Effect on the condensed consolidated financial statements or other significant matters Standards not yet adopted Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) ASU No. 2020-06 This standard simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible debt instruments and contracts on an entity’s own equity. Specifically, the standard removes certain accounting models which separate the embedded conversion features from the host contract for convertible instruments, requiring bifurcation only if the convertible debt feature qualifies as a derivative under ASC 815 or if the convertible debt was issued at a substantial premium. This standard also removes certain settlement conditions required for equity contracts to qualify for the derivative scope exception. Lastly, entities are required to use the if-converted method for convertible instruments in the diluted earnings per share calculation. Early adoption is permitted, but no earlier than the fiscal year beginning after December 15, 2020. The standard can be applied using a full or modified retrospective approach. January 1, 2022 Upon adoption, the Company expects a decrease to additional paid in capital, an increase in the carrying value of its convertible notes and an increase to retained earnings. After adoption, the Company expects a reduction in its reported interest expense and the Company expects to reverse the deferred tax consequences originally recognized. Additionally, the Company expects the use of the if-converted method for calculating diluted earnings per share will result in an increase in weighted-average shares outstanding. The Company will continue to evaluate the effect that the adoption of this standard will have on its financial statements. 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 (Tables

Fair value measurements (Tables)	9 Months Ended
	Sep. 30, 2021
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, 2021 December 31, 2020 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 139,110 $ — $ 139,110 $ 19,445 $ — $ 19,445 Total cash equivalents $ 139,110 $ — $ 139,110 $ 19,445 $ — $ 19,445 Marketable securities: Commercial paper $ — $ 55,436 $ 55,436 $ — $ — $ — Corporate debt securities — 26,748 26,748 — — — Total marketable securities $ — $ 82,184 $ 82,184 $ — $ — $ — (1) Included in cash and cash equivalents in the accompanying Condensed Consolidated Balance Sheets. Cash balances were $157.2 million as of September 30, 2021 and $308.2 million, including $2.0 million of restricted cash, as of December 31, 2020.

Condensed consolidated financ_2

Condensed consolidated financial statement details (Tables)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventory	Inventory (in thousands) September 30, 2021 December 31, 2020 Components $ 10,372 $ 13,229 Finished goods 110,519 84,685 Total inventory $ 120,891 $ 97,914
Property, Plant and Equipment	Property and equipment, net (in thousands) September 30, 2021 December 31, 2020 Leasehold improvements $ 33,772 $ 35,180 Production, engineering and other equipment 45,594 48,908 Tooling 16,899 17,635 Computers and software 22,554 22,385 Furniture and office equipment 5,618 6,315 Tradeshow equipment and other 1,970 5,860 Construction in progress 102 22 Gross property and equipment 126,509 136,305 Less: Accumulated depreciation and amortization (106,100) (112,594) Property and equipment, net $ 20,409 $ 23,711
Schedule of Finite-Lived Intangible Assets	Intangible assets September 30, 2021 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 51,066 $ (50,948) $ 118 Domain name 15 — 15 Total intangible assets $ 51,081 $ (50,948) $ 133 December 31, 2020 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology $ 51,066 $ (49,867) $ 1,199 Domain name 15 — 15 Total intangible assets $ 51,081 $ (49,867) $ 1,214
Schedule of Future Amortization	At September 30, 2021, expected amortization expense of intangible assets with definite lives for future periods was as follows: (in thousands) Total Year ending December 31, 2021 (remaining 3 months) $ 71 2022 47 $ 118
Schedule of Other Assets	Other long-term assets (in thousands) September 30, 2021 December 31, 2020 Point of purchase (POP) displays $ 2,399 $ 3,612 Long-term deferred tax assets 270,819 966 Deposits and other 7,172 7,193 Other long-term assets $ 280,390 $ 11,771
Schedule of Accrued Liabilities	Accrued expenses and other current liabilities (in thousands) September 30, 2021 December 31, 2020 Accrued liabilities $ 33,295 $ 39,444 Accrued sales incentives 24,958 30,609 Employee related liabilities 8,937 7,067 Return liability 10,266 10,817 Warranty liability 7,446 7,997 Inventory received 10,274 1,709 Customer deposits 5,976 2,347 Purchase order commitments 914 1,921 Income taxes payable 188 221 Other 10,226 11,644 Accrued expenses and other current liabilities $ 112,480 $ 113,776

Employee benefit plans (Tables)

Employee benefit plans (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement [Abstract]
schedule of share-based compensation, Performance Stock Units Award Activity [Table Text Block]	A summary of the Company’s PSU activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 1,319 $ 4.48 Granted 573 7.93 Vested (532) 4.69 Forfeited (288) 4.05 Non-vested shares at September 30, 2021 1,072 $ 6.34
Schedule of Share-based Compensation, Stock Options, Activity	A summary of the Company’s stock option activity for the nine months ended September 30, 2021 is as follows: Shares (in thousands) Weighted-average exercise price Weighted-average remaining contractual term (in years) Aggregate intrinsic value (in thousands) Outstanding at December 31, 2020 3,431 $ 8.79 6.50 $ 6,259 Granted 309 7.97 Exercised (548) 5.31 Forfeited/Cancelled (58) 18.90 Outstanding at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Vested and expected to vest at September 30, 2021 3,134 $ 9.13 6.20 $ 6,853 Exercisable at September 30, 2021 2,074 $ 10.90 5.01 $ 2,930
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, 2021 is as follows: Shares (in thousands) Weighted-average grant date fair value Non-vested shares at December 31, 2020 10,639 $ 5.04 Granted 3,698 8.35 Vested (4,590) 5.29 Forfeited (821) 5.67 Non-vested shares at September 30, 2021 8,926 $ 6.22

Net loss per share (Tables)

Net loss per share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Net Income per Share, Basic and Diluted	The following table presents the calculations of basic and diluted net income (loss) per share: Three months ended September 30, Nine months ended September 30, (in thousands, except per share data) 2021 2020 2021 2020 Numerator: Net income (loss) $ 311,761 $ 3,307 $ 318,545 $ (111,196) Denominator: Weighted-average common shares - basic for Class A and Class B common stock 155,009 149,406 153,618 148,491 Effect of dilutive securities 7,737 2,443 9,110 — Weighted-average common shares - diluted for Class A and Class B common stock 162,746 151,849 162,728 148,491 Net income (loss) per share Basic $ 2.01 $ 0.02 $ 2.07 $ (0.75) Diluted $ 1.92 $ 0.02 $ 1.96 $ (0.75)
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) 2021 2020 2021 2020 Stock-based awards 1,772 10,598 1,682 14,652

Income taxes (Tables)

Income taxes (Tables)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	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 excludes 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) 2021 2020 2021 2020 Income tax expense (benefit) $ (270,228) $ 1,242 $ (280,679) $ 4,710

Commitments, contingencies an_2

Commitments, contingencies and guarantees (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [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) 2021 2020 2021 2020 Operating lease cost (1) $ 2,797 $ 3,352 $ 8,785 $ 11,647 Sublease income — (133) (333) (393) Right-of-use asset impairment cost — 12,460 — 12,460 Net lease cost $ 2,797 $ 15,679 $ 8,452 $ 23,714 (1) Operating lease cost includes variable lease costs, which are immaterial.
Schedule of Supplemental Cash Flow Information Related To Leases [Text Block]	Supplemental cash flow information related to leases was as follows: Nine months ended September 30, (in thousands) 2021 2020 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 11,167 $ 10,869 Right-of-use assets obtained in exchange for operating lease liabilities 1,314 1,252 Operating lease modifications to decrease right-of-use assets — (2,482) Supplemental balance sheet information related to leases was as follows: September 30, 2021 December 31, 2020 Weighted-average remaining lease term (in years) - operating leases 4.90 5.53 Weighted-average discount rate - operating leases 6.1% 6.2%
Schedule of Maturities of Lease Liabilities [Text Block]	As of September 30, 2021, maturities of operating lease liabilities were as follows: (in thousands) September 30, 2021 2021 (remaining 3 months) $ 2,047 2022 13,555 2023 12,192 2024 11,686 2025 11,477 Thereafter 12,684 Total lease payments 63,641 Less: Imputed interest (9,416) Present value of lease liabilities $ 54,225

Concentrations of risk and ge_2

Concentrations of risk and geographic information (Tables)	9 Months Ended
	Sep. 30, 2021
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) 2021 2020 2021 2020 Accounts receivable sold $ 39,231 $ 30,832 $ 73,867 $ 66,393 Factoring fees 130 247 345 433
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) 2021 2020 2021 2020 Americas $ 160,875 $ 157,720 $ 414,113 $ 297,607 Europe, Middle East and Africa (EMEA) 85,791 64,563 196,784 129,191 Asia and Pacific (APAC) 70,003 58,224 159,038 107,355 Total revenue $ 316,669 $ 280,507 $ 769,935 $ 534,153
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, 2021 December 31, 2020 Customer A 18% 23% Customer B 31% 15% Customer C * 12%
Sales Revenue [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	Third-party 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, 2021 2020 2021 2020 Customer A 13% 13% 12% 25% Customer B * * * 10 Customer C * * * 14 * Less than 10% of total revenue for the period indicated.

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Nov. 24, 2020	Jan. 01, 2018	Apr. 12, 2017
Property, Plant and Equipment [Line Items]
Restricted Cash	$ 0		$ 0				$ 2,000
Allowance for Doubtful Other Receivables, Current						$ 500	800
Operating Lease, Impairment Loss	0	$ 12,460	0	$ 12,460
Deferred Revenue, Revenue Recognized	6,600	3,200	24,600	12,900
Advertising Expense			34,100	$ 67,300	$ 73,000
Accumulated deficit	(331,971)		$ (331,971)				(650,516)
Product Warranty Liability [Line Items]
Warranty Period			12 months
Deferred Revenue, Revenue Recognized	13,800	$ 5,600
Contract with Customer, Liability	$ 38,500		$ 38,500				$ 29,300
Cumulative effect of adoption of new accounting standard [Member]
Property, Plant and Equipment [Line Items]
Accumulated deficit									$ 15,000
Convertible Senior Notes due 2022 [Member]
Property, Plant and Equipment [Line Items]
Interest rate										3.50%
Debt Instrument										$ 175,000
Convertible Senior Notes due 2025 [Member]
Property, Plant and Equipment [Line Items]
Interest rate								1.25%
Debt Instrument								$ 143,800
Europe [Member]
Product Warranty Liability [Line Items]
Warranty Period			2 years

Fair value measurements (Detail

Fair value measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Nov. 24, 2020	Apr. 12, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash	$ 157,200	$ 308,200
Marketable securities	82,184	0
Restricted Cash	0	2,000
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	139,110	19,445
Marketable securities	82,184	0
Fair Value, Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	139,110	19,445
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	139,110	19,445
Marketable securities	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	139,110	19,445
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Marketable securities	82,184	0
Fair Value, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Convertible Senior Notes due 2022 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument				$ 175,000
Convertible Senior Notes due 2022 [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	133,300	146,000
Convertible Senior Notes due 2025 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument			$ 143,800
Convertible Senior Notes due 2025 [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of convertible senior notes	182,000	166,800
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	26,748	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	26,748	0
Commercial Paper | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	55,436	0
Commercial Paper | Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Commercial Paper | Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 55,436	$ 0

Condensed consolidated financ_3

Condensed consolidated financial statement details - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Cash and Cash Equivalents [Line Items]
Cash	$ 157,200	$ 308,200
Cash and cash equivalents	$ 296,357	$ 325,654	$ 146,871

Condensed consolidated financ_4

Condensed consolidated financial statement details - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 10,372	$ 13,229
Finished goods	110,519	84,685
Total inventory	$ 120,891	$ 97,914

Condensed consolidated financ_5

Condensed consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 126,509	$ 136,305
Less: Accumulated depreciation and amortization	(106,100)	(112,594)
Property and equipment, net	20,409	23,711
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	33,772	35,180
Production, engineering and other equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	45,594	48,908
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	16,899	17,635
Computers and software [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	22,554	22,385
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	5,618	6,315
Tradeshow Equipment and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	1,970	5,860
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 102	$ 22

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	$ 51,066		$ 51,066		$ 51,066
Accumulated amortization	(50,948)		(50,948)		(49,867)
Net carrying value	118		118		1,199
Intangible Assets, Gross (Excluding Goodwill)	51,081		51,081		51,081
Intangible assets, net	133		133		1,214
Indefinite-lived Intangible Assets [Roll Forward]
Amortization of intangible assets	100	$ 1,000	1,100	$ 3,900
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, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2021	$ 71
Net carrying value	118	$ 1,199
Finite-Lived Intangible Assets, Amortization Expense, Year Three	$ 47

Condensed consolidated financ_8

Condensed consolidated financial statement details - Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill	$ 146,459	$ 146,459

Condensed consolidated financ_9

Condensed consolidated financial statement details - Other Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
POP Displays	$ 2,399		$ 2,399			$ 3,612
Deferred Income Tax Assets, Net	270,819		270,819		$ 966	966	$ 864
Deposits and other	7,172		7,172			7,193
Other long-term assets	280,390		280,390			$ 11,771
Amortization of intangible assets	$ 100	$ 1,000	$ 1,100	$ 3,900

Condensed consolidated finan_10

Condensed consolidated financial statement details - Accrued Liabilities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Employee related liabilities	$ 8,937,000	$ 7,067,000
Accrued sales incentives	24,958,000	30,609,000
Other Accounts Payable and Accrued Liabilities	33,295,000	39,444,000
Customer Refund Liability, Current	10,266,000	10,817,000
Warranty liability	7,446,000	7,997,000
Customer deposits	5,976,000	2,347,000
Income taxes payable	188,000	221,000
Purchase Commitment, Remaining Minimum Amount Committed	914,000	1,921,000
Inventory received	10,274,000	1,709,000
Other	10,226,000	11,644,000
Accrued expenses and other current liabilities	$ 112,480,000	$ 113,776,000

Condensed consolidated finan_11

Condensed consolidated financial statement details - Product Warranty (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Beginning balances	$ 7,621,000	$ 7,326,000	$ 8,523,000	$ 11,398,000
Charged to cost of revenue	4,560,000	4,560,000	11,329,000	7,546,000
Settlements of warranty claims	(4,272,000)	(4,269,000)	(11,943,000)	(11,327,000)
Ending balances	7,909,000	$ 7,617,000	7,909,000	$ 7,617,000
Warranty liability	7,446,000		7,446,000		$ 7,997,000
Product Warranty Accrual, Noncurrent	$ 500,000		$ 500,000

Financing Arrangements (Details

Financing Arrangements (Details) $ / shares in Units, shares in Thousands	Jan. 21, 2021USD ($)	Nov. 24, 2020USD ($)$ / shares	Apr. 12, 2017USD ($)$ / sharesshares	Sep. 30, 2021USD ($)	Jun. 30, 2021USD ($)	Sep. 30, 2020USD ($)shares	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)shares	Dec. 31, 2021	Apr. 01, 2021shares	Jan. 22, 2021USD ($)	Dec. 31, 2020USD ($)	Oct. 22, 2020shares
Line of Credit Facility [Line Items]
Long-term debt				$ 109,470,000			$ 109,470,000					$ 218,172,000
Amortization of Debt Discount (Premium)							10,535,000	$ 7,348,000
Payments for Repurchase of Equity, Prepaid Forward			$ 78,000,000
Treasury Shares Acquired, Estimated, Prepaid Forward | shares						9,200		9,200
Operating Lease, Impairment Loss				0		$ 12,460,000	0	$ 12,460,000
Own-share Lending Arrangement, Shares, Issued | shares			9,200
SharesPurchasedUnderPrepaidForward | shares										400			8,800
Debt Instrument, Covenant Compliance, Asset Coverage Ratio									1.50
Adjustments to Additional Paid in Capital, Capped Call Option, Issuance Costs					$ (10,200,000)
Option Indexed To Issuers Equity, cap price		$ 12.0925
Payments to repurchase convertible debt					50,000,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities					200,000
Option Indexed To Issuers Equity, cap price		12.0925
Short-term Debt				120,200,000			120,200,000
Convertible Senior Notes due 2022 [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Unamortized Discount				4,500,000			4,500,000
Convertible Debt Principal Amount Conversion				125,000,000			125,000,000
Interest Expense, Debt				1,100,000			3,300,000
Amortization of Debt Issuance Costs				100,000			400,000
Amortization of Debt Discount (Premium)				2,000,000			5,800,000
Short-term Debt | Convertible Senior Notes due 2022 [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Net				$ 300,000			300,000
Convertible Senior Notes due 2025 [Member] | Private Placement [Member]
Line of Credit Facility [Line Items]
Debt Instrument		$ 125,000,000
2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit agreement, current borrowing capacity											$ 50,000,000
Minimum Fixed Charge Coverage Ratio, minimum balance	$ 10,000,000
Line of Credit Facility, Unused Capacity, Minimum Liquidity Requirement, Amount	55,000,000
Line of Credit Facility, Unused Capacity, Qualified Cash	$ 40,000,000
Convertible Senior Notes due 2022 [Member]
Line of Credit Facility [Line Items]
Debt Instrument			$ 175,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount			$ 128,300,000
Debt Instrument, Unamortized Discount												10,200,000
Interest rate			3.50%
Debt Instrument, Convertible, Conversion Ratio			94.0071
Convertible Debt Principal Amount Conversion			$ 1,000									125,000,000
Debt Instrument, Convertible, Conversion Price | $ / shares			$ 10.64
Convertible debt, equity portion			$ 46,700,000
Effective rate		2.40%	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												114,000,000
Interest Expense, Debt						1,500,000		4,600,000
Amortization of Debt Issuance Costs						100,000		600,000
Amortization of Debt Discount (Premium)						$ 2,400,000		$ 7,300,000
Gain (Loss) on Extinguishment of Debt					5,400,000
Debt Instrument, Repurchase Amount		$ 56,200,000
Debt Instrument, Repurchased Face Amount		45,200,000
Debt Instrument, Repurchase Amount		56,200,000
Gain (Loss) on Extinguishment of Debt					5,400,000
Convertible Senior Notes due 2022 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			4,200,000
Debt Issuance Costs, Net												800,000
proceedsfromconvertibledebtamountallocatedtodebtcomponent					50,600,000
Convertible Senior Notes due 2022 [Member] | Additional Paid-in Capital [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross			$ 1,500,000
proceedsfromconvertibledebtamountallocatedtoequitycomponent					$ 5,400,000
Convertible Senior Notes due 2025 [Member]
Line of Credit Facility [Line Items]
Debt Instrument		143,800,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount		$ 106,900,000
Debt Instrument, Unamortized Discount				$ 31,400,000			31,400,000					36,100,000
Interest rate		1.25%
Debt Instrument, Convertible, Conversion Ratio		107.1984
Convertible Debt Principal Amount Conversion		$ 1,000		$ 143,800,000			143,800,000					143,800,000
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 9.3285
Convertible debt, equity portion		$ 36,900,000
Effective rate		7.50%
Debt Issuance Costs, Net		$ 4,700,000
Percentage of conversion price of notes				130.00%
Percentage of trading price of notes				98.00%
Long-term debt				$ 109,500,000			109,500,000					104,200,000
Interest Expense, Debt				400,000			1,300,000
Amortization of Debt Issuance Costs				200,000			600,000
Amortization of Debt Discount (Premium)				1,600,000			4,700,000
Convertible Senior Notes due 2025 [Member] | Long-term Debt [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross		3,500,000
Debt Issuance Costs, Net				$ 2,900,000			$ 2,900,000					$ 3,400,000
Convertible Senior Notes due 2025 [Member] | Additional Paid-in Capital [Member]
Line of Credit Facility [Line Items]
Debt Issuance Costs, Gross		1,200,000
Convertible Senior Notes due 2025 [Member] | Over-Allotment Option [Member]
Line of Credit Facility [Line Items]
Debt Instrument		$ 18,800,000
Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage	0.375%
Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Unused Capacity, Commitment Fee Percentage	0.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	2.00%
Base Rate [Member] | Minimum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	0.50%
Base Rate [Member] | Maximum [Member] | 2021 Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.00%

Stockholders' equity (Details)

Stockholders' equity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021USD ($)shares	Dec. 31, 2021shares	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)shares	Sep. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Class of Stock [Line Items]
Stock options outstanding (shares)	3,134,000	3,431,000			3,431,000
Common stock available for future grants (shares)		48,184,000
Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio	1
Stockholders' Equity Attributable to Parent | $	$ 554,995		$ 238,165	$ 211,471	$ 216,018	$ 143,097	$ 132,078	$ 177,498	$ 233,529
Treasury Stock [Member]
Class of Stock [Line Items]
Stockholders' Equity Attributable to Parent | $	$ (113,613)		$ (113,613)	$ (113,613)	$ (113,613)	$ (113,613)	$ (113,613)	$ (113,613)	$ (113,613)
Common Class A [Member]
Class of Stock [Line Items]
Common stock authorized (shares)	500,000,000	500,000,000			500,000,000
Common stock outstanding (shares)	128,697,000				122,233,000
Common Stock, Voting Rights, Number	1
Common Stock, Conversion Ratio		1
Common Stock, Shares, Issued	128,697,000	128,700,000			122,233,000
Common Stock, Voting Rights	one
Common Stock, Voting Rights	one
Common Class B [Member]
Class of Stock [Line Items]
Common stock authorized (shares)	150,000,000	150,000,000			150,000,000
Common stock outstanding (shares)	27,259,000	27,300,000			28,885,000
Common Stock, Voting Rights, Number	10
Common Stock, Shares, Issued	27,259,000	27,300,000			28,885,000
Common Stock, Voting Rights	ten
Common Stock, Voting Rights	ten
Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	8,926,000	10,639,000			10,639,000
Performance Shares [Member]
Class of Stock [Line Items]
Restricted stock units outstanding (shares)	1,072,000	1,319,000			1,319,000
Common Stock
Class of Stock [Line Items]
Common stock available for future grants (shares)		32,795,000

Employee benefit plans - Narrat

Employee benefit plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 9,329	$ 10,029	$ 8,869	$ 8,413	$ 5,876	$ 7,637
ESPP stock issued during period (shares)							800,000	1,000,000
ESPP weighted average purchase price of shares purchased (usd per share)							$ 5.28	$ 3.42
Unearned stock-based compensation, expected recognition period							1 year 11 months 23 days
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay							4.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match							100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent							100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent							100.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer							$ 1,400	$ 1,400	$ 4,000
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							3,698,000
Weighted average price of shares granted (usd per share)							$ 8.35
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (shares)							573,000
Weighted average price of shares granted (usd per share)							$ 7.93
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	$ 52,400						$ 52,400
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	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Shares (in thousands)
Outstanding at beginning of period (shares)	3,431
Granted (shares)	309
Exercised (shares)	(548)
Forfeited/Cancelled (shares)	(58)
Outstanding at end of period (shares)	3,134	3,431
Weighted-average exercise price
Outstanding at beginning of period (in dollars per share)	$ 8.79
Granted (usd per share)	7.97
Exercised (usd per share)	5.31
Outstanding at end of period (in dollars per share)	$ 9.13	$ 8.79
Weighted Average Remaining Contractual Term (in years)	6 years 2 months 12 days	6 years 6 months
Aggregate intrinsic value (in thousands)	$ 6,853	$ 6,259,000
Vested and Expected to Vest (shares)	3,134
Vested and Expected to Vest - Weighted Average Exercise Price (in dollars per share)	$ 9.13
Vested and Expected to Vest- Weighted Average Remaining Contractual Term	6 years 2 months 12 days
Vested and Expected to Vest - Aggregate Intrinsic Value	$ 6,853
Exercisable (shares)	2,074
Exercisable - Weighted average exercise price (in dollars per share)	$ 10.90
Exercisable - Weighted Average Remaining Contractual Term	5 years 3 days
Exercisable - Aggregate intrinsic value	$ 2,930
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 18.90

Employee benefit plans - Restri

Employee benefit plans - Restricted Stock Units Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2021$ / sharesshares
RSUs [Member]
Shares (in thousands)
Non-vested shares at beginning of period (shares) | shares	10,639
Granted (shares) | shares	3,698
Vested (shares) | shares	(4,590)
Forfeited (shares) | shares	(821)
Non-vested shares at end of period (shares) | shares	8,926
Weighted-average grant date fair value
Non-vested shares at beginning of period (in dollars per share) | $ / shares	$ 5.04
Weighted average price of shares granted (usd per share) | $ / shares	8.35
Weighted average price of shares forfeited (usd per share) | $ / shares	5.67
Non-vested shares at end of period (in dollars per share) | $ / shares	6.22
Weighted average price of shares vested (usd per share) | $ / shares	$ 5.29
Performance Shares [Member]
Shares (in thousands)
Non-vested shares at beginning of period (shares) | shares	1,319
Granted (shares) | shares	573
Vested (shares) | shares	(532)
Forfeited (shares) | shares	(288)
Non-vested shares at end of period (shares) | shares	1,072
Weighted-average grant date fair value
Non-vested shares at beginning of period (in dollars per share) | $ / shares	$ 4.48
Weighted average price of shares granted (usd per share) | $ / shares	7.93
Weighted average price of shares forfeited (usd per share) | $ / shares	4.05
Non-vested shares at end of period (in dollars per share) | $ / shares	6.34
Weighted average price of shares vested (usd per share) | $ / shares	$ 4.69

Employee benefit plans - Fair V

Employee benefit plans - Fair Value Assumptions for Stock Options (Details)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	6.1		5.4-6.1
Dividend yield	0.00%	0.00%	0.00%
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expected Term	6.1		5.4-6.1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected Term	6.1		5.4-6.1
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	0.5	0.5	0.5
Dividend yield	0.00%	0.00%	0.00%
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expected Term	0.5	0.5	0.5
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Expected Term	0.5	0.5	0.5

Employee benefit plans - Fair_2

Employee benefit plans - Fair Value Assumptions for Restricted Stock Units and ESPP (Details)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 9,329	$ 8,413	$ 28,227	$ 21,926
Cost of Revenue [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	483	340	1,420	1,175
Research and Development [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	4,380	3,597	13,131	9,682
Selling and Marketing Expense [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	1,950	1,601	5,968	4,107
General and Administrative [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 2,516	$ 2,875	$ 7,708	$ 6,962

Employee benefit plans Performa

Employee benefit plans Performance Stock Units activity (Details) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (shares)	1,072	1,319	1,319
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 6.34		$ 4.48
Granted (shares)	573
Weighted average price of shares granted (usd per share)	$ 7.93
Vested (shares)	(532)
Weighted average price of shares vested (usd per share)	$ 4.69
Forfeited (shares)	(288)
Weighted average price of shares forfeited (usd per share)	$ 4.05
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units outstanding (shares)	8,926	10,639	10,639
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 6.22		$ 5.04
Granted (shares)	3,698
Weighted average price of shares granted (usd per share)	$ 8.35
Vested (shares)	(4,590)
Weighted average price of shares vested (usd per share)	$ 5.29
Forfeited (shares)	(821)
Weighted average price of shares forfeited (usd per share)	$ 5.67

Net loss per share Additional I

Net loss per share Additional Information (Details)	Nov. 24, 2020USD ($)shares$ / shares	Apr. 12, 2017USD ($)shares$ / shares	Sep. 30, 2020shares	Sep. 30, 2021shares	Sep. 30, 2020shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Shares Acquired, Estimated, Prepaid Forward			9,200,000		9,200,000
Option Indexed To Issuers Equity, cap price | $	$ 12.0925
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 Senior Notes due 2022 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument | $		$ 175,000,000
Interest rate		3.50%
Maximum number of shares issuable upon conversion of the notes		20,600,000
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 10.64
Convertible Senior Notes due 2025 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument | $	$ 143,800,000
Interest rate	1.25%
Maximum number of shares issuable upon conversion of the notes	20,800,000
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 9.3285

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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 12, 2017
Earnings Per Share [Abstract]
Treasury Shares Acquired, Estimated, Prepaid Forward				9,200				9,200
Numerator:
Net income (loss)	$ 311,761	$ 16,952	$ (10,168)	$ 3,307	$ (50,975)	$ (63,528)	$ 318,545	$ (111,196)
Denominator:
Weighted Average Number of Shares Outstanding, Basic	155,009			149,406			153,618	148,491
Weighted Average Number Diluted Shares Outstanding Adjustment	7,737			2,443			9,110	0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Own-share Lending Arrangement, Shares, Issued									9,200
Treasury Shares Acquired, Estimated, Prepaid Forward				9,200				9,200
Earnings Per Share, Diluted	$ 1.92			$ 0.02			$ 1.96	$ (0.75)

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)		10,598	1,682	14,652
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		10,598	1,682	14,652
Share-based Payment Arrangement
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (shares)	1,772
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	1,772

Income taxes - Income Tax Expen

Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (270,228)	$ 1,242		$ (280,679)	$ 4,710	$ 1,359
Effective tax rate		27.30%	23.20%	(741.20%)	(4.40%)	(1.30%)
Current Federal Tax Expense (Benefit)				$ (164)	$ (52)	$ (2,821)
Current State and Local Tax Expense (Benefit)				84	48	175
Current Foreign Tax Expense (Benefit)	$ 2,000	$ 1,500		400	4,400	4,394
Current Income Tax Expense (Benefit)				4,876	(4,395)	1,748
Deferred Federal Income Tax Expense (Benefit)				0	0	248
Deferred Foreign Income Tax Expense (Benefit)				(50)	(33)	(637)
Deferred Income Tax Expense (Benefit)				$ (50)	$ (33)	$ (389)
Deferred Tax Assets, Tax Credit Carryforwards, Other							$ 16,800

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic									$ 680,200,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets									8,100,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		$ 2,541,000					$ 250,000	$ 483,000
Other Tax Expense (Benefit)			$ 300,000
Income tax (benefit) expense	$ (270,228,000)		1,242,000			$ (280,679,000)	4,710,000	1,359,000
Loss before income taxes	41,533,000		$ 4,549,000			$ 37,866,000	$ (106,486,000)	$ (107,675,000)
Effective tax rate			27.30%		23.20%	(741.20%)	(4.40%)	(1.30%)
Current Foreign Tax Expense (Benefit)	2,000,000		$ 1,500,000			$ 400,000	$ 4,400,000	$ 4,394,000
Income Tax Effects Allocated Directly to Equity, Other	4,700,000		300,000			4,700,000	2,100,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability							2,600,000
Unrecognized Tax Benefits, Period Increase (Decrease)							500,000
Restructuring adjustments	600,000	0	3,500,000	$ (18,694,000)		600,000	5,900,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	262,700,000		3,200,000			262,700,000	1,300,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		$ 2,541,000					250,000	483,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions						1,681,000	0	445,000
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions						(3,929,000)	(5,628,000)	(26,956,000)
Tax Adjustments, Settlements, and Unusual Provisions			200,000				500,000
Other Tax Expense (Benefit)			$ 300,000
Unrecognized Tax Benefits	20,400,000					20,400,000			27,471,000	$ 27,500,000	$ 32,556,000	$ 27,178,000	$ 58,584,000
Accruals and reserves									11,687,000	19,493,000
Deferred Tax Assets, Gross									296,609,000	290,795,000
Valuation allowance									(287,276,000)	(277,693,000)
Deferred Tax Assets, Net of Valuation Allowance									9,333,000	13,102,000
Deferred Tax Liabilities, Property, Plant and Equipment									(1,112,000)	0
Deferred Tax Liabilities, Other									(7,255,000)	(12,238,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,300,000					6,300,000			15,300,000	12,500,000	17,300,000
Income (Loss) from Continuing Operations before Income Taxes, Domestic						(70,572,000)	(28,233,000)	(110,318,000)
Income (Loss) from Continuing Operations before Income Taxes, Foreign						8,615,000	$ 9,163,000	$ 2,643,000
Net operating loss carryforwards									177,987,000	163,832,000
Tax credit carryforwards									79,694,000	75,624,000
Stock-based compensation									5,192,000	5,710,000
Allowance for returns									2,492,000	4,150,000
Intangible assets									5,453,000	5,384,000
Deferred Tax Assets, Operating lease liabilities									14,104,000	16,602,000
Deferred Tax Liabilities, Gross									(8,367,000)	(12,238,000)
Deferred Income Tax Assets, Net	$ 270,819,000					270,819,000			966,000	$ 966,000	$ 864,000
deferred tax assets, valuation allowance, change due to extinguishment of debt						7,200,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic									680,200,000
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration									1,700,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit									13,000,000
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities						$ 12,600,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount									45,800,000
Tax Credit Carryforward, Amount									45,800,000
california [Domain]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount									42,900,000
Tax Credit Carryforward, Amount									42,900,000
california [Domain]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local									239,700,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local									239,700,000
States Other than CA [Domain]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local									234,700,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local									$ 234,700,000

Income taxes - Reconciliation t

Income taxes - Reconciliation to Federal Statutory Rate (Details) - USD ($)	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Amount [Abstract]
Tax at federal statutory rate						$ (13,011,000)	$ (4,005,000)	$ (22,612,000)
Change in valuation allowance						16,767,000	4,717,000	42,772,000
Impact of foreign operations						5,010,000	(3,949,000)	3,285,000
Stock-based compensation						696,000	1,731,000	10,974,000
State taxes, net of federal benefits						(682,000)	1,872,000	(2,997,000)
Tax credits						(3,538,000)	(5,123,000)	(5,996,000)
Income tax (benefit) expense	$ (270,228,000)		$ 1,242,000			(280,679,000)	4,710,000	1,359,000
Impact of IRS audit						0	0	(9,687,000)
Other						(539,000)	24,000	528,000
Permanent tax adjustments						123,000	305,000	$ 3,786,000
Restructuring adjustments	$ 600,000	$ 0	$ 3,500,000	$ (18,694,000)		$ 600,000	$ 5,900,000
Percent [Abstract]
Tax at federal statutory rate						21.00%	21.00%	21.00%
Change in valuation allowance						(27.10%)	(24.70%)	(39.70%)
Impact of foreign operations						(8.10%)	20.70%	(3.10%)
Stock-based compensation						(1.10%)	(9.10%)	(10.20%)
State taxes, net of federal benefits						1.10%	(9.80%)	2.80%
Tax credits						(5.70%)	(26.80%)	(5.60%)
Income tax provision at effective rate			27.30%		23.20%	(741.20%)	(4.40%)	(1.30%)
Impact of IRS audit						0.00%	0.00%	9.00%
Other						0.90%	(0.10%)	(0.60%)
Permanent Tax adjustment						(0.20%)	(1.60%)	(3.50%)
Restructuring adjustments						0.00%	0.00%	17.40%

Income taxes - Deferred Tax Ass

Income taxes - Deferred Tax Assets (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 262,700,000	$ 3,200,000	$ 262,700,000	$ 1,300,000
Deferred tax assets:
Net operating loss carryforwards					$ 177,987,000	$ 163,832,000
Tax credit carryforwards					79,694,000	75,624,000
Stock-based compensation					5,192,000	5,710,000
Allowance for returns					2,492,000	4,150,000
Intangible assets					5,453,000	5,384,000
Accruals and reserves					11,687,000	19,493,000
Total deferred tax assets					296,609,000	290,795,000
Valuation allowance					(287,276,000)	(277,693,000)
Total deferred tax assets, net of valuation allowance					$ 9,333,000	$ 13,102,000

Commitments, contingencies an_3

Commitments, contingencies and guarantees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		57 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2026	Dec. 31, 2021	Dec. 31, 2020
Long-term Purchase Commitment [Line Items]
Operating Lease, Cost	$ 2,797	$ 3,352	$ 8,785	$ 11,647
Operating Lease, Payments			11,167	10,869
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	2,047		2,047
Lessee, Operating Lease, Liability, to be Paid, Year One	13,555		13,555
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	12,192		12,192
Lessee, Operating Lease, Liability, Payments, Due Year Two	11,686		11,686
Lessee, Operating Lease, Liability, Payments, Due Year Three	11,477		11,477
Lessee, Operating Lease, Liability, Payments, Due after Year Five	12,684		12,684
Lessee, Operating Lease, Liability, Payments, Due	63,641		63,641
us-gaap_Lessee Operating Lease Liability Undiscounted Excess Amount	(9,416)		(9,416)
Other Commitment	$ 353,500		353,500
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			1,314	1,252
LesseeOperatingLeaseModification			$ 0	(2,482)
Operating Lease, Weighted Average Remaining Lease Term	4 years 10 months 24 days		4 years 10 months 24 days				5 years 6 months 10 days
Operating Lease, Weighted Average Discount Rate, Percent	6.10%		6.10%				6.20%
Operating Lease, Liability	$ 54,225		$ 54,225
Sublease Income	0	(133)	(333)	(393)	$ (20,000)
Operating Lease, Impairment Loss	0	12,460	0	12,460
Lease, Cost	2,797	$ 15,679	8,452	$ 23,714
Other Commitments [Line Items]
Other Commitment	$ 353,500		$ 353,500
Other Commitment, to be Paid, Year One						$ 19,165
Other Commitment, to be Paid, Year Two						6,361
Other Commitment, to be Paid, Year Three						1,882
Other Commitment, to be Paid, Year Four						118
Other Commitment, to be Paid, Year Five						0
Long-Term Debt, Maturity, Year Five						145,322
Long-Term Debt, Maturity, Year Four						1,797
Long-Term Debt, Maturity, Year Three						1,797
Long-Term Debt, Maturity, Year Two						128,073
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months						7,279
Sponsorship Commitments
Other Commitments [Line Items]
Other Commitment, to be Paid, Year One						1,059
Other Commitment, to be Paid, Year Two						450
Other Commitment, to be Paid, Year Three						0
Other Commitment, to be Paid, Year Four						0
Other Commitment, to be Paid, Year Five						$ 0

Concentrations of risk and ge_3

Concentrations of risk and geographic information - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Revenue	$ 316,669,000	$ 280,507,000	$ 769,935,000	$ 534,153,000
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	138,100,000	$ 141,000,000	362,800,000	$ 263,500,000
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 6,600,000		$ 6,600,000		$ 6,900,000

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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Concentration Risk [Line Items]
Accounts receivable sold	$ 39,231	$ 30,832	$ 73,867	$ 66,393
Factoring fees	$ 130	$ 247	$ 345	$ 433
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk			18.00%		23.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk			31.00%		15.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk					12.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk	13.00%	13.00%	12.00%	25.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk				10.00%
Customer Concentration Risk [Member] | Sales Revenue [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk				14.00%

Concentrations of risk and ge_5

Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 316,669,000	$ 280,507,000	$ 769,935,000	$ 534,153,000
United States [Member]
Segment Reporting Information [Line Items]
Revenue	138,100,000	141,000,000	362,800,000	263,500,000
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	160,875,000	157,720,000	414,113,000	297,607,000
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	85,791,000	64,563,000	196,784,000	129,191,000
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 70,003,000	$ 58,224,000	$ 159,038,000	$ 107,355,000

Restructuring charges - Restruc

Restructuring charges - Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs				Restructuring charges for each period were as follows: Year ended December 31, (in thousands) 2021 2020 2019 Cost of revenue $ 52 $ 1,270 $ 1,379 Research and development 447 8,383 12,794 Sales and marketing 275 11,189 5,291 General and administrative 158 5,660 3,279 Total restructuring charges $ 932 $ 26,502 $ 22,743
Schedule of Restructuring Reserve by Type of Cost				The following table provides a summary of the Company’s restructuring activities and the movement in the related liabilities recorded in accrued expenses and other current liabilities, and other long-term liabilities on the Condensed Consolidated Balance Sheets under the first quarter 2017 restructuring plan. (in thousands) Severance Other Total Restructuring liability as of December 31, 2017 — 3,550 3,550 Restructuring charges (1) — 4,783 4,783 Cash paid — (3,293) (3,293) Non-cash charges — 627 627 Restructuring liability as of December 31, 2018 — 5,667 5,667 Restructuring charges (1) — 1,395 1,395 Cash paid — (2,257) (2,257) Non-cash reductions — (335) (335) Restructuring liability as of December 31, 2019 $ — $ 4,470 $ 4,470 Restructuring charges (1) — (57) (57) Cash paid — (3,559) (3,559) Restructuring liability as of December 31, 2020 $ — $ 854 $ 854
Restructuring charges				$ 932	$ 26,502	$ 22,743
Operating Lease, Impairment Loss	$ 0	$ 12,460		0	12,460
Cost of Revenue [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				52	1,270	1,379
Research and Development [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				447	8,383	12,794
Selling and Marketing Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				275	11,189	5,291
General and Administrative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				158	5,660	3,279
First quarter 2017 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 23,100
Restructuring charges				(57)	1,395	4,783
Restructuring Reserve	854			854			$ 4,470	$ 5,667	$ 3,550
Other Restructuring Costs				(57)	1,395	4,783
Cash paid				(3,559)	(2,257)	(3,293)
Restructuring Reserve, Settled without Cash					(335)	(627)
First quarter 2017 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			12,800
First quarter 2017 restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0			0			0	0	0
Severance Costs			$ 10,300	0	0	0
Cash paid				0	0	0
Restructuring Reserve, Settled without Cash					0	0
First quarter 2017 restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	854			854			4,470	$ 5,667	$ 3,550
Cash paid				(3,559)	(2,257)	(3,293)
Restructuring Reserve, Settled without Cash					$ (335)	$ (627)
Second quarter 2020 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				25,500
Restructuring charges				25,547
Restructuring Reserve	88			88			0
Other Restructuring Costs				5,800
Cash paid				(8,830)
Restructuring Reserve, Settled without Cash				(16,629)
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5,800
Second quarter 2020 restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	49			49			0
Severance Costs				7,287
Cash paid				(7,238)
Restructuring Reserve, Settled without Cash				0
Second quarter 2020 restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	39			39			0
Cash paid				(1,592)
Restructuring Reserve, Settled without Cash				(4,169)
Second quarter 2020 restructuring [Member] | ROU Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0			0			$ 0
Cash paid				0
Restructuring Reserve, Settled without Cash				$ (12,460)

Restructuring charges - Narrati

Restructuring charges - Narrative (Details) - USD ($) $ in Thousands	Apr. 14, 2020	Mar. 15, 2017	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 932	$ 26,502	$ 22,743
Operating Lease, Impairment Loss			$ 0	$ 12,460		0	12,460
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						(57)	1,395	4,783
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	$ 0	$ 0
Second quarter 2020 restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expected percent of positions eliminated	20.00%
Restructuring charges						25,500
Other Restructuring Costs						5,800
Second quarter 2020 restructuring [Member] | Non-cancelable Leases, Accelerated Depreciation and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						5,800
Second quarter 2020 restructuring [Member] | Employee Severance and Pay Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs						$ 7,287

Restructuring charges - Restr_2

Restructuring charges - Restructuring Liability (Details) - First quarter 2017 restructuring [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs		$ (57)	$ 1,395	$ 4,783
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470	5,667	3,550
Restructuring charges		(57)	1,395	4,783
Cash paid		(3,559)	(2,257)	(3,293)
Non-cash settlements			(335)	(627)
Restructuring liability as of December 31, 2017		854
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 10,300	0	0	0
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		0	0	0
Cash paid		0	0	0
Non-cash settlements			0	0
Restructuring liability as of December 31, 2017		0
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring liability as of October 1, 2016		4,470	5,667	3,550
Cash paid		(3,559)	(2,257)	(3,293)
Non-cash settlements			$ (335)	$ (627)
Restructuring liability as of December 31, 2017		$ 854

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands	3 Months Ended		9 Months Ended			57 Months Ended
	Sep. 30, 2021USD ($)ft²	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)ft²	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2026USD ($)	Dec. 31, 2020
Subsequent Event [Line Items]
Restructuring charges			$ 932	$ 26,502	$ 22,743
Area of Real Estate Property | ft²	78,408		78,408
Sublease Income	$ 0	$ 133	$ 333	$ 393		$ 20,000
Operating Lease, Weighted Average Discount Rate, Percent	6.10%		6.10%				6.20%
Lessor, Operating Lease, Variable Lease Payment, Terms and Conditions						3%

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount				$ 287,276	$ 277,693	$ 271,374
First quarter 2017 restructuring [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Restructuring Reserve	$ 854				4,470	5,667	$ 3,550
Other Restructuring [Member] | First quarter 2017 restructuring [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Restructuring Reserve	854				4,470	5,667	3,550
Allowance for Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount				$ 492	830	500	750
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Charges to Expense	24	$ (616)	$ (199)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	314	286	449
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount					$ 277,693	$ 271,374	$ 226,458
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Charges to Revenue	(7,179)	1,602	2,144
Charges to Expense	$ (16,762)	$ (4,717)	$ (42,772)

Uncategorized Items - gpro-2021

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 150,301,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 327,654,000