GoPro (GPRO) 10-K 29 Feb 16 2015 FY Annual report Financial data

Document, Entity and Informatio

Document, Entity and Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Jan. 31, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Entity Registrant Name	GoPro, Inc.
Entity Central Index Key	1,500,435
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 5,005.6
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		100,761,057
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		36,104,708

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 279,672	$ 319,929
Marketable securities	194,386	102,327
Accounts receivable, net	145,692	183,992
Inventory	188,232	153,026
Prepaid expenses and other current assets	25,261	63,769
Total current assets	833,243	823,043
Property and equipment, net	70,050	41,556
Intangible assets, net	31,027	2,937
Goodwill	57,095	14,095
Other long-term assets	111,561	36,060
Total assets	1,102,976	917,691
Current liabilities:
Accounts payable	89,989	126,240
Accrued liabilities	192,446	118,507
Deferred revenue	12,742	14,022
Total current liabilities	295,177	258,769
Long-term taxes payable	21,770	13,266
Other long-term liabilities	13,996	4,452
Total liabilities	$ 330,943	$ 276,487
Commitments, contingencies and guarantees
Stockholders’ equity:
Preferred stock, $0.0001 par value, 5,000 shares authorized; none issued	$ 0	$ 0
Common stock and additional paid-in capital, $0.0001 par value, 500,000 Class A shares authorized,100,596 and 52,091 shares issued and outstanding, respectively; 150,000 Class B shares authorized, 36,005 and 77,023 shares issued and outstanding, respectively	663,311	533,000
Treasury stock, at cost, 1,545 shares and none, respectively	(35,613)	0
Retained earnings	144,335	108,204
Total stockholders’ equity	772,033	641,204
Total liabilities and stockholders’ equity	$ 1,102,976	$ 917,691

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable, Current	$ 1,400	$ 1,250
Preferred Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	5,000,000	5,000,000
Preferred Stock, Shares Issued	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	500,000,000
Treasury Stock, Shares	1,545,000	0
Common Class A [Member]
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	100,596,000	52,091,000
Common stock, shares, outstanding	100,596,000	52,091,000
Common Class B [Member]
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Shares, Issued	36,005,000	77,023,000
Common stock, shares, outstanding	36,005,000	77,023,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 1,619,971	$ 1,394,205	$ 985,737
Cost of revenue	946,757	766,970	623,953
Gross profit	673,214	627,235	361,784
Operating expenses:
Research and development	241,694	151,852	73,737
Sales and marketing	268,939	194,377	157,771
General and administrative	107,833	93,971	31,573
Total operating expenses	618,466	440,200	263,081
Operating income	54,748	187,035	98,703
Other expense, net	(2,163)	(6,060)	(7,374)
Income before income taxes	52,585	180,975	91,329
Income tax expense	16,454	52,887	30,751
Net income	36,131	128,088	60,578
Less: net income allocable to participating securities	0	(16,512)	(16,727)
Net income attributable to common stockholders—basic	36,131	111,576	43,851
Add: net income allocable to dilutive participating securities	0	2,277	2,309
Net income attributable to common stockholders—diluted	$ 36,131	$ 113,853	$ 46,160
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ 0.27	$ 1.07	$ 0.54
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ 0.25	$ 0.92	$ 0.47
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares)	134,595	104,453	81,018
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares)	146,486	123,630	98,941

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) Statement - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock [Member]Redeemable Convertible Preferred Stock [Member]	Common Stock and Additional Paid in Capital [Member]	Treasury Stock [Member]	Retained Earnings (Accumulated Deficit) [Member]
Temporary Equity, Shares Outstanding		30,523
Temporary Equity, Carrying Amount, Attributable to Parent		$ 77,138
Shares, Outstanding			80,714
Stockholders' Equity Attributable to Parent	$ (79,741)		$ 479		$ (80,220)
Temporary Equity, Other Changes	(60)	$ 60	$ (60)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			613
Stock Issued During Period, Value, Stock Options Exercised	1,148		$ 1,148
Allocated Share-based Compensation Expense	10,887		$ 10,887
Stock Repurchased and Retired During Period, Shares			(15)
Stock Repurchased and Retired During Period, Value	(242)		$ 0		(242)
Stock Issued During Period, Shares, Acquisitions			108
Stock Issued During Period, Value, Acquisitions	1,741		$ 1,741
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	323		$ 323
Net income	60,578				60,578
Temporary Equity, Shares Outstanding		30,523
Temporary Equity, Carrying Amount, Attributable to Parent		$ 77,198
Shares, Outstanding			81,420
Stockholders' Equity Attributable to Parent	(5,366)		$ 14,518		(19,884)
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	7,681		7,681
Allocated Share-based Compensation Expense	71,399		$ 71,399
Stock Repurchased and Retired During Period, Shares			(1,430)
Stock Repurchased and Retired During Period, Value	(1,177)		$ (1,177)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	77,134		$ 77,134
Net income	128,088				128,088
Stock Issued During Period, Shares, New Issues			10,188
Stock Issued During Period, Value, New Issues	286,247		$ 286,247
Stock Issued During Period, Shares, Conversion of Convertible Securities		(30,523)	(30,523)
Stock Issued During Period, Value, Conversion of Convertible Securities	(77,198)	$ (77,198)	$ (77,198)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			8,414
Temporary Equity, Shares Outstanding		0
Temporary Equity, Carrying Amount, Attributable to Parent		$ 0
Shares, Outstanding			129,115
Stockholders' Equity Attributable to Parent	641,204		$ 533,000		108,204
Treasury stock, at cost, 1,545 shares and none, respectively	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	12,375
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	$ 36,413		36,413
Adjustments to Additional Paid in Capital, Income Tax Effect from Settlement of Restricted Stock Units	(13,943)		(13,943)
Treasury Stock, Value, Acquired, Cost Method	(35,613)
Allocated Share-based Compensation Expense	80,583		$ 80,583
Stock Repurchased and Retired During Period, Shares			(5,218)
Stock Repurchased and Retired During Period, Value	0		$ 0
Treasury Stock, Shares, Acquired			(1,545)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	27,258		$ 27,258
Net income	36,131
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			14,249
Temporary Equity, Shares Outstanding		0
Temporary Equity, Carrying Amount, Attributable to Parent		$ 0
Shares, Outstanding			136,601
Stockholders' Equity Attributable to Parent	772,033		$ 663,311		$ 144,335
Treasury stock, at cost, 1,545 shares and none, respectively	$ (35,613)			$ (35,613)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Net income	$ 36,131	$ 128,088	$ 60,578
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,981	17,945	12,034
Stock-based compensation	80,680	71,399	10,887
Excess tax benefit from stock-based compensation	(29,348)	(77,134)	(323)
Deferred income taxes	(11,468)	(16,920)	(8,129)
Accretion on investments	3,001	0	0
Other	2,426	1,865	1,224
Changes in operating assets and liabilities:
Accounts receivable, net	38,313	(61,323)	(42,453)
Inventory	(35,005)	(41,033)	(51,583)
Prepaid expenses and other assets	(23,281)	(30,317)	(15,355)
Accounts payable and other liabilities	68,461	98,354	135,197
Deferred revenue	(1,280)	5,998	400
Net cash provided by operating activities	157,611	96,922	102,477
Investing activities:
Purchases of property and equipment, net	(51,245)	(27,210)	(18,325)
Purchases of marketable securities	(220,055)	(103,827)	0
Maturities of marketable securities	94,680	1,083	0
Sales of marketable securities	30,048	0	0
Acquisitions, net of cash acquired	(65,405)	(3,950)	(2,912)
Net cash used in investing activities	(211,977)	(133,904)	(21,237)
Financing activities:
Proceeds from issuance of common stock, net	22,833	300,097	527
Repurchases of outstanding Class A common stock	(35,613)	0	0
Excess tax benefit from stock-based compensation	29,348	77,134	323
Payment of deferred acquisition-related consideration	0	(2,000)	0
Payment of debt issuance costs and deferred public offering costs	(903)	(5,730)	(1,165)
Proceeds from issuance of debt	0	0	30,000
Repayment of debt	0	(114,000)	(46,000)
Net cash provided by (used in) financing activities	15,665	255,501	(16,315)
Effect of exchange rate changes on cash and cash equivalents	(1,556)	0	0
Net increase (decrease) in cash and cash equivalents	(40,257)	218,519	64,925
Cash and cash equivalents at beginning of period	319,929	101,410	36,485
Cash and cash equivalents at end of period	279,672	319,929	101,410
Interest paid in cash	0	1,853	4,904
Income taxes paid (refunded) in cash	(1,093)	37,283	2,831
Conversion of preferred stock to common stock, net of issuance cost accretion	0	77,198	0
Purchases of property and equipment included in accounts payable and accrued liabilities	5,153	2,474	2,937
Reclass of deferred public offering costs to additional paid-in capital	$ 0	$ 7,722	$ 0

Schedule II Statement

Schedule II Statement - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 8,555	$ 0
Allowance for Doubtful Accounts Receivable, Current	1,400	1,250
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 26,280	$ 25,747	$ 14,352	$ 9,077

Business overview

Business overview	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business overview	Business overview GoPro, Inc. (GoPro or the Company) makes mountable and wearable cameras (capture devices) and accessories. The Company’s products are sold globally through retailers, wholesale distributors and on the Company’s website. The Company's global corporate headquarters are located in San Mateo, California.

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of significant accounting policies Basis of presentation. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The Company's fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30, and September 30. Principles of consolidation. These consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. Unless otherwise specified, references to the Company are references to GoPro, Inc. and its consolidated subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Use of estimates. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s consolidated financial statements and accompanying notes. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from management's estimates. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected. Comprehensive income. For all periods presented, comprehensive income approximated net income. Therefore, the consolidated statements of comprehensive income have been omitted. Prior period reclassifications. Reclassifications of certain prior period amounts in the consolidated financial statements have been made to conform to the current period presentation. Cash equivalents and marketable securities. Cash equivalents primarily consist of investments in money market funds with maturities of three months or less from the date of purchase. Marketable securities consist of commercial paper, U.S. treasury securities, U.S. agency securities, and corporate debt securities, and are classified as available-for-sale securities. As the Company views these securities as available to support current operations, it has classified all available-for-sale securities as current assets. Available-for-sale securities are carried at fair value with unrealized gains and losses, if any, included in stockholders' equity. As of December 31, 2015 , the Company's marketable securities were recorded at their amortized cost which approximated fair value. Unrealized losses are charged against other income (expense), net, for declines in fair value below the cost of an individual investment that is deemed to be other than temporary. The Company did not identify any marketable securities as other-than-temporarily impaired for the periods presented. The Company determines realized gains or losses on sale of marketable securities on a specific identification method, and records such gains or losses as other income (expense), net. Accounts receivable and allowance for doubtful accounts. Accounts receivable are stated at invoice value less estimated allowances for returns and doubtful accounts. The Company records allowances based upon its assessment of various factors, such as: historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions and other factors that may affect a customer’s ability to pay. The allowance for doubtful accounts as of December 31, 2015 and 2014 was $1.4 million and $1.3 million , respectively. Inventory. Inventory consists of finished goods and component parts, which are purchased directly or from contract manufacturers. Inventory is stated at the lower of cost or market on a first-in, first-out basis. The Company writes down its inventory for estimated obsolescence or excess inventory equal to the difference between the cost of inventory and estimated market value. The Company’s assessment of market value is based upon assumptions around market conditions and estimated future demand for its products within a specified time horizon, generally 12 months . Adjustments to reduce inventory to net realizable value are recognized in cost of revenue in the current period. Point of purchase (POP) displays. The Company provides retailers with POP displays, generally free of charge, in order to facilitate the marketing of the Company’s products within retail stores. The POP displays contain a display that broadcasts video images taken by GoPro cameras with product placement available for cameras and accessories. POP display costs, less any fees charged, are capitalized as long-term assets and charged to sales and marketing expense over the expected period of benefit, which generally ranges from 24 to 36 months . POP amortization was $16.8 million , $18.0 million and $13.5 million in 2015, 2014 and 2013, respectively. Property and equipment, net. Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful life of the assets, ranging from one to ten years. Leasehold improvements are amortized over the shorter of the lease term or their expected useful life. Property and equipment pending installation, configuration or qualification are classified as construction in progress. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred. Fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the reporting date. The Company estimates and categorizes the fair value of its financial assets by applying the following hierarchy established by the FASB, which prioritizes the inputs to valuation techniques used to measure fair value: Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to directly access. Level 2 Valuations based on quoted prices for similar assets or liabilities; valuations for interest-bearing securities based on non-daily quoted prices in active markets; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. Level 3 Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The fair value of Level 2 financial instruments is obtained from an independent pricing service, which may use quoted market prices for identical or comparable instruments or model driven valuations using observable market data or inputs corroborated by observable market data. Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. For leases that contain rent escalation or rent concession provisions, the Company recognizes rent expense on a straight-line basis over the term of the lease. The Company does not assume renewals in its determination of the lease term unless the renewals are deemed to be reasonably assured at lease inception. Leasehold improvements are included in property and equipment, net. Goodwill and other intangible assets . Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Acquired intangible assets other than goodwill are amortized over their useful lives unless the lives are determined to be indefinite. For intangible assets acquired in a business combination, the estimated fair values of the assets received are used to establish their recorded values. Valuation techniques consistent with the market approach, income approach and/or cost approach are used to measure fair value. Impairment of goodwill and long-lived assets. The Company performs an annual assessment of its goodwill during the fourth quarter of each calendar year and in interim periods if certain events occur to determine if any events or circumstances exist, such as an adverse change in business climate or a decline in the overall industry demand, that would indicate it is more likely than not that the fair value of its single reporting unit is less than its carrying value. If further testing is deemed necessary, a two-step approach is applied. The first step involves comparing the fair value of the reporting unit with its carrying value. The second step, if necessary, measures the amount of impairment, if any, by comparing the carrying value of the goodwill to its implied fair value. Other indefinite-lived intangible assets are assessed for impairment at least annually. If their value carrying value exceeds the estimated fair value, the difference is recorded as an impairment. Long-lived assets, such as property and equipment and intangible assets subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated future undiscounted cash flows expected to be generated by the asset group. If it is determined that an asset group is not recoverable, an impairment charge is recognized for the amount by which the carrying amount of the asset group exceeds its fair value. There was no material impairment of goodwill, indefinite-lived intangible assets or other long-lived assets for any periods presented. Warranty. The Company records a liability for estimated product warranty costs at the time product revenue is recognized. The Company's standard warranty obligation to its end-users generally provides a 12 -month warranty coverage on all of its products except in the European Union where the Company provides a two -year warranty. The Company's estimate of costs to service its warranty obligations is based on its historical experience of repair and replacement of the associated products and expectations of future conditions. The warranty obligation is affected by product failure rates and the related use of materials, labor costs and freight incurred in correcting any product failure. Revenue recognition. Revenue is primarily comprised of product revenue, net of returns and sales incentives. The Company derives substantially all of its revenue from the sale of capture devices and the related implied post contract support (PCS). The Company recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, and collectability is reasonably assured. Evidence of an arrangement consists of an order from its distributors, resellers, or online customers. The Company considers delivery to have occurred once title and risk of loss has been transferred. For most of the Company's revenue, these criteria are met at the time the product is shipped. For customers who purchase products directly from the Company’s website, the Company defers revenue until delivery to the customer's address because the Company retains a portion of the risk of loss on these sales during transit. Customer deposits are included in accrued liabilities on the consolidated balance sheet and are recognized as revenue when all the revenue recognition criteria are met. The Company grants limited rights to return product for certain large retailers and distributors. The Company records reductions to revenue and cost of sales for expected future product returns at the time of sale based on analyses of historical return trends by customer class. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality, and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company has determined its sales of capture devices are multiple element arrangements that generally include the following two units of accounting: a) the hardware component (camera and accessories) and the embedded firmware essential to the functionality of the camera delivered at the time of sale, and b) the implied right for the customer to receive PCS. PCS includes the right to receive, on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, email and telephone support. The Company accounts for each element separately and allocates revenue based on their relative selling prices. The Company uses a hierarchy to determine the selling price to be used for allocating revenue to deliverables: (i) vendor-specific objective evidence of fair value (VSOE), (ii) third-party evidence of selling price (TPE) and (iii) best estimate of the selling price (BESP). The Company has neither VSOE nor TPE since the deliverables are not sold separately and there are not comparable deliverables sold by other companies. BESP reflects the Company’s best estimates of what the selling prices of elements would be if they were sold regularly on a stand-alone basis. The Company's process for determining BESP considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company's support, the amount of time and cost that is allocated to the Company's efforts to develop the undelivered elements, and market trends in the pricing for similar offerings. Revenue allocated to the delivered hardware and the related essential software is recognized at the time of sale provided the conditions for recognition of revenue have been met. Revenue allocated to PCS is deferred and recognized on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience. Sales incentives. The Company offers sales incentives through various programs, consisting primarily of cooperative advertising and marketing development fund programs. The Company records cooperative advertising and marketing development fund programs with customers as a reduction to revenue unless it receives an identifiable benefit in exchange for credits claimed by the customer and can reasonably estimate the fair value of the identifiable benefit received, in which case the Company will record it as a marketing expense. Marketing development funds recorded as marketing expense were not material for the periods presented. In addition, the Company offers price protection discounts to certain customers when new capture device models are released or repriced and the customer has remaining inventory on hand. The Company calculates price protection discounts in the period that the price reduction goes into effect, and they are recorded as a reduction of revenue, based on the evaluation of inventory currently held by the customer subject to price protection. Shipping costs. Amounts billed to customers for shipping and handling are classified as revenue and the Company's related shipping and handling costs incurred are classified as cost of revenue. Sales taxes. Sales taxes collected from customers and remitted to respective governmental authorities are recorded as liabilities and not included in revenue. Research and development. Research and development expense includes internal and external costs. Internal costs include employee related expenses, equipment costs, depreciation expense and allocated facility costs. External research and development expenses consist of costs associated with consultants, tooling and prototype materials. Research and development expense is related to developing new products and services and the designing of significant improvements to existing products. Research and development costs to establish the technological feasibility of the Company’s internally developed software is expensed as incurred. To date, the period between achieving technological feasibility and the release of internally developed software to be sold, leased, or marketed has been short and development costs qualifying for capitalization have been insignificant. Advertising costs. Advertising costs consist of costs associated with print, television and ecommerce media advertisements and are expensed as incurred. The Company incurs promotional expenses resulting from payments under event, resort and athlete sponsorship contracts. These sponsorship arrangements are considered to be executory contracts and, as such, the costs are expensed as performance under the contract is received. The costs associated with preparation of sponsorship activities, including the supply of GoPro products, media team support, and activation fees are expensed as incurred. Prepayments made under sponsorship agreements are included in prepaid expenses or other long-term assets depending on the period to which the prepayment applies. Advertising costs were $64.7 million , $47.2 million and $55.5 million in 2015, 2014 and 2013, respectively. Stock-based compensation. The Company accounts for stock-based compensation in accordance with accounting guidance that requires all stock-based awards granted to employees and directors to be measured at fair value and recognized as an expense. The Company primarily issues restricted stock units. For service-based awards, stock-based compensation is recognized on a straight-line basis over the requisite service period, net of estimated forfeitures. For performance and market-based awards which also require a service period, the Company uses graded vesting over the longer of the derived service period or when the performance or market condition is satisfied. The Company recognizes a benefit from stock-based compensation as additional paid-in capital if an excess tax benefit is realized by following the with-and-without approach. The indirect effects of stock-based compensation deductions are reflected in the income tax provision for purposes of measuring the excess tax benefit at settlement of awards. Foreign currency. The U.S. dollar is the functional currency of the Company's foreign subsidiaries. The Company remeasures monetary assets or liabilities denominated in currencies other than the U.S. dollar using exchange rates prevailing on the balance sheet date, and non-monetary assets and liabilities at historical rates. Foreign currency remeasurement and transaction gains and losses are included in other expense, net and have not been material for any periods presented. Income taxes. The Company utilizes the asset and liability method for computing its income tax provision, under which deferred tax assets and liabilities are recognized for the expected future consequences of temporary differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates. Management makes estimates, assumptions and judgments to determine the Company's provision for income taxes, deferred tax assets and liabilities, and any valuation losses recorded against deferred tax assets. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income and, to the extent the Company believes recovery is not likely, establishes a valuation allowance. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. Interest and penalties related to unrecognized tax benefits are recognized within income tax expense. Segment information. The Company operates as one operating segment as it only reports financial information on an aggregate and consolidated basis to its CEO, who is the Company’s chief operating decision maker. Recent accounting pronouncements Standard Description Date of adoption Effect on the financial statements or other significant matters Standards that are not yet adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606) This standard is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products and services are transferred to customers. In August 2015, the FASB deferred the effective date by one year while providing the option to adopt the standard on the original effective date of January 1, 2017. The standard may be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. January 1, 2018 The Company is currently evaluating the impact the adoption of this standard will have on its consolidated financial statements and related disclosures. ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement Period Adjustments Under the updated guidance, the acquirer in a business combination is required to recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. This new standard will be applied prospectively to adjustments to provisional amounts that occur after the effective date of this update. January 1, 2016 The Company does not believe the adoption of this standard will have a material impact to its consolidated financial statements. Standards that were adopted ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classifications of Deferred Taxes This standard requires that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance becomes effective for the Company on January 1, 2017, with early adoption permitted. December 31, 2015 The Company early adopted this standard, prospectively. Adoption resulted in a $22.2 million reduction to current assets and a corresponding increase in other long-term assets at December 31, 2015. Prior periods were not adjusted. Adoption had no impact on the Company’s results of operations.

Consolidated financial statemen

Consolidated financial statement details	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidated financial statement details	Consolidated financial statement details The following sections and tables provide details of selected balance sheet items. Inventory December 31, (in thousands) 2015 2014 Components $ 9,476 $ 4,324 Finished goods 178,756 148,702 Total inventory $ 188,232 $ 153,026 Prepaid expenses and other current assets December 31, (in thousands) 2015 2014 Prepaid expenses $ 6,132 $ 3,905 Prepaid income taxes 4,696 26,504 Tenant allowance receivable 4,249 — Prepaid licenses 2,818 2,053 Current deferred tax assets — 24,218 Other current assets 7,366 7,089 Prepaid expenses and other current assets $ 25,261 $ 63,769 Property and equipment, net (dollars in thousands) Useful life (in years) December 31, December 31, Leasehold improvements 3–10 $ 40,841 $ 22,787 Production, engineering and other equipment 4 25,174 8,755 Tooling 1–2 19,537 16,159 Computers and software 2 14,581 9,731 Furniture and office equipment 3 11,389 6,150 Construction in progress 4,632 3,944 Tradeshow equipment and other 2-5 4,136 3,830 Gross property and equipment 120,290 71,356 Less: Accumulated depreciation and amortization (50,240 ) (29,800) Property and equipment, net $ 70,050 $ 41,556 Depreciation expense was $24.8 million , $16.8 million and $10.9 million in 2015, 2014 and 2013, respectively. Acquisitions and acquired intangible assets and goodwill In 2015, the Company completed acquisitions qualifying as business combinations for aggregate consideration of $70.2 million , the substantial majority of which was cash consideration. These acquisitions were not material to the Company's consolidated financial statements, either individually or in the aggregate, and therefore actual and proforma disclosures under the applicable accounting guidance have not been presented. The following table summarizes the allocation of the fair values of the assets acquired and liabilities assumed, and the related useful lives, where applicable: (in thousands) Estimated Fair value Purchased technology 4 - 6 years $ 25,676 In-process research and development (IPR&D) 6,600 Net liabilities assumed (353 ) Deferred income tax liabilities (4,676 ) Net assets acquired 27,247 Goodwill 43,000 Total fair value consideration $ 70,247 Goodwill is primarily attributable to expected synergies in the technologies that can be leveraged by the Company in future product offerings related to device and software offerings. Goodwill is not expected to be deductible for tax purposes. The carrying amount of goodwill was $57.1 million and $14.1 million as of December 31, 2015 and 2014, respectively. The increase in 2015 and 2014 was entirely attributable to goodwill acquired. The following table summarizes the Company's acquired intangible assets: December 31, 2015 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology and other amortizable assets $ 32,952 $ (8,540 ) $ 24,412 IPR&D and other non-amortizable assets 6,615 — 6,615 Total intangible assets $ 39,567 $ (8,540 ) $ 31,027 December 31, 2014 (in thousands) Gross carrying value Accumulated Net carrying value Purchased technology and other amortizable assets $ 7,275 $ (4,353 ) $ 2,922 Other non-amortizable assets 15 — 15 Total intangible assets $ 7,290 $ (4,353 ) $ 2,937 As of December 31, 2015 , technological feasibility has not been established for IPR&D assets; they have no alternative future use and, as such, continue to be accounted for as indefinite-lived intangible assets. Amortization expense was $4.2 million , $1.1 million and $1.1 million in 2015, 2014 and 2013, respectively. At December 31, 2015 , the estimated amortization expense of existing intangible assets for future periods is as follows: (in thousands) Total Year ending December 31, 2016 $ 5,956 2017 5,172 2018 4,780 2019 4,269 2020 3,365 Thereafter 870 $ 24,412 Other long-term assets December 31, (in thousands) 2015 2014 POP displays $ 27,989 $ 18,743 Long-term deferred tax assets 41,936 8,611 Income tax receivable 33,206 — Deposits and other 8,430 8,706 Other long-term assets $ 111,561 $ 36,060 Accrued liabilities December 31, (in thousands) 2015 2014 Accrued payables $ 64,831 $ 56,617 Excess purchase order commitments 38,477 447 Accrued sales incentive 29,298 9,635 Employee related liabilities 26,491 28,959 Warranty liability 10,400 6,025 Customer deposits 8,877 4,903 Income taxes payable 7,536 2,732 Other 6,536 9,189 Accrued liabilities $ 192,446 $ 118,507

Fair value measurements

Fair value measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair value measurements	Fair value measurements The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy are summarized as follows: December 31, 2015 December 31, 2014 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 51,059 $ — $ 51,059 $ 80,968 $ — $ 80,968 Corporate debt securities — — — — 2,000 2,000 Total cash equivalents $ 51,059 $ — $ 51,059 $ 80,968 $ 2,000 $ 82,968 Marketable securities: U.S. treasury securities $ — $ — $ — $ 1,994 $ — $ 1,994 U.S. agency securities — 14,451 14,451 — 7,020 7,020 Commercial paper — 2,197 2,197 — 2,497 2,497 Corporate debt securities — 165,825 165,825 — 90,816 90,816 Municipal securities — 11,913 11,913 — — — Total marketable securities $ — $ 194,386 $ 194,386 $ 1,994 $ 100,333 $ 102,327 (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheets as of December 31, 2015 and 2014. Cash balances were $228.6 million and $237.0 million as of December 31, 2015 and 2014, respectively. For the periods presented, the Company had no financial assets or liabilities that were classified as Level 3, and had no transfers of financial assets between levels. The remaining contractual maturities of available-for-sale marketable securities as of the period-ends noted, are as follows: December 31, (in thousands) 2015 2014 Less than one year $ 122,199 $ 58,764 Greater than one year but less than two years 72,187 43,563 Total $ 194,386 $ 102,327 At December 31, 2015 and 2014, the amortized cost of the Company's cash equivalents and marketable securities approximated their fair value and there were no material unrealized gains/(losses) either individually or in the aggregate.

Stockholders' equity (deficit)

Stockholders' equity (deficit) and redeemable convertible preferred stock (Notes)	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' equity (deficit) and redeemable convertible preferred stock	Stockholders' equity (deficit) and redeemable convertible preferred stock Initial public offering In July 2014, the Company completed its IPO in which the Company issued and sold 8.9 million shares of Class A common stock at a public offering price of $24.00 per share and the selling stockholders sold 11.6 million shares of Class A common stock, including 2.7 million shares upon the underwriters' option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders. The total net proceeds received by the Company from the IPO were $200.8 million after deducting underwriting discounts and commissions of $12.8 million and other offering expenses of approximately $6.2 million . Follow-on offering In November 2014, the Company completed a follow-on offering in which the Company issued and sold 1.3 million shares of Class A common stock at a public offering price of $75.00 per share and the selling stockholders sold 10.6 million shares of Class A common stock, including 1.6 million shares upon the underwriters' option to purchase additional shares. The Company did not receive any proceeds from the sale of shares by the selling stockholders. The total net proceeds received by the Company from the follow-on offering were $93.2 million after deducting underwriting discounts and commissions of $3.4 million and other offering expenses of approximately $1.5 million . Redeemable convertible preferred stock Prior to the Company's IPO, the Company had 30.5 million of Series A redeemable convertible preferred stock outstanding, which were convertible into shares of Class B common stock at a rate of 1-for-1 . Concurrent with the close of the IPO, those outstanding shares were converted into Class B common stock. Preferred stock Following the Company's IPO, the Company had 5.0 million shares of preferred stock authorized, none of which was issued or outstanding at December 31, 2015 and 2014. Common stock Following the Company's IPO, the Company had two classes of authorized common stock: Class A common stock with 500.0 million shares authorized and Class B common stock with 150.0 million shares authorized. As of December 31, 2015 , 100.6 million shares of Class A stock were issued and outstanding and 36.0 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 December 31, 2015, 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 December 31, 2015 : (in thousands) December 31, 2015 Stock options outstanding 13,081 Restricted stock units outstanding 4,638 Common stock available for future grants 20,084 Total common stock shares reserved for issuance 37,803 Stock repurchase program On September 30, 2015, the Company's board of directors authorized a program to repurchase up to $300.0 million of the Company's Class A common stock. The repurchase program, which expires in September 2016, does not obligate the Company to acquire any specific number of shares and may be discontinued or extended at any time by the board of directors. Share repurchases under the program may be made from time-to-time through open market transactions, block trades, privately negotiated transactions or otherwise, including under plans complying with both Rule 10b-18 and Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. During the fourth quarter of 2015, under the program, the Company repurchased approximately 1.5 million shares of its common stock at an average price of $23.05 per share, for an aggregate purchase price of approximately $35.6 million . The Company currently intends to hold the repurchased shares as treasury stock. CEO stock contributions In 2015, the CEO contributed an aggregate 5.2 million shares of Class B common stock to the Company without consideration per the terms of a Contribution Agreement dated December 28, 2011, and amended on May 11, 2015. Under the original Contribution Agreement, the CEO agreed to contribute back to the Company from time-to-time the same number of shares of common stock as are issued to a certain Company employee upon the exercise of certain stock options held by such employee. Pursuant to this agreement, the CEO contributed back to the Company 0.5 million shares of Class B common stock from January 2015 through April 2015. In May 2015, the CEO contributed back to the Company 4.7 million shares of Class B common stock pursuant to the amended agreement, representing all of the then remaining shares subject to the contribution obligations. All of the shares contributed by the CEO were retired during the year.

Employee benefit plans

Employee benefit plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee benefit plans	Employee benefit plans Equity incentive plans The Company has outstanding equity grants from its three stock-based employee compensation plans: the 2014 Equity Incentive Plan (2014 Plan), the 2010 Equity Incentive Plan (2010 Plan), and the 2014 Employee Stock Purchase Plan (ESPP). In the second quarter of 2014, the Company terminated the authority to grant new awards under the 2010 Plan and 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. The 2014 Plan serves as the successor to the 2010 Plan and provides for the granting of incentive and nonqualified stock options, restricted stock awards (RSAs), restricted stock units (RSUs), stock appreciation rights, stock bonus awards, and performance awards to qualified employees, non-employee directors, and consultants. Options granted under the 2014 Plan generally expire within 10 years from the date of grant and generally vest over four years and are exercisable for shares of the Company's Class A stock. Options with performance or market-based conditions are generally subject to a required service period along with the performance or market condition. RSUs granted under the 2014 Plan generally vest annually over a four year period based upon continued service and are settled at vesting in shares of the Company's Class A common stock. The ESPP allows eligible employees to purchase shares of the Company's Class A common stock through payroll deductions at a price equal to 85% of the lesser of the fair market values of the stock as of the first date or the ending date of each six-month offering period. The 2014 Plan and the ESPP also provides for automatic annual increases in the number of shares reserved for future issuance. Employee retirement plan The Company has a 401(k) defined contribution retirement plan (Retirement Plan) covering U.S. full-time employees. The Retirement Plan provides for voluntary employee contributions from 1% to 86% of annual compensation, subject to a maximum limit allowed by Internal Revenue Service guidelines. The Company matches 100% of each employee’s contributions up to a maximum of 4% of the employee's eligible compensation. The Company's matching contribution to the plan was $5.5 million and $2.7 million in 2015 and 2014, respectively. Stock option activity A summary of the Company’s stock option activity in 2015 and related information is as follows: Options outstanding (shares in thousands) Shares Weighted- average Weighted- Aggregate Outstanding at December 31, 2014: 25,134 $ 6.62 7.09 $ 1,425,339 Granted 792 39.66 Exercised (12,375 ) 2.01 Forfeited/Cancelled (470 ) 38.84 Outstanding at December 31, 2015: 13,081 $ 11.82 6.70 $ 108,846 Exercisable at December 31, 2015 8,449 $ 6.19 5.89 $ 103,696 Vested and expected to vest at December 31, 2015 12,858 $ 11.62 6.67 $ 108,681 The weighted average grant date fair values of all options granted and assumed were $18.40 , $11.51 and $8.45 per share in 2015, 2014 and 2013, respectively. The total fair value of all options vested were $26.9 million , $16.0 million , and $5.2 million in 2015, 2014 and 2013, respectively. The aggregate intrinsic value of the stock options outstanding as of December 31, 2015 was $108.8 million , which represents the value of the Company's closing stock price on December 31, 2015 in excess of the weighted-average exercise price multiplied by the number of options outstanding. The total intrinsic values of options exercised were $633.6 million , $253.3 million and $4.6 million in 2015, 2014 and 2013, respectively. At December 31, 2015 , there was $50.2 million of unearned stock-based compensation expense related to unvested options, which is expected to be amortized over a weighted average period of 2.2 years . Restricted stock awards A summary of the Company's RSA activity in 2015 is as follows: Shares (in thousands) Weighted- Aggregate (in thousands) Non-vested shares at December 31, 2014 17 $ 6.30 $ 1,017 Vested (17) Non-vested shares at December 31, 2015 — The total fair value of all restricted stock and early exercised stock options subject to repurchase vested was zero , $11.2 million and $6.1 million in 2015, 2014 and 2013, respectively. Early exercised stock options were fully vested in 2014. At December 31, 2015, all RSAs were fully vested and there was no unearned stock-based compensation remaining. Restricted stock units A summary of the Company’s RSU activity in 2015 and 2014 is as follows: (shares in thousands) Shares Weighted- average grant date fair value Non-vested shares at December 31, 2013 270 $ 1.52 Granted 5,573 22.01 Vested (1,533 ) 18.42 Forfeited (3 ) 57.73 Non-vested shares at December 31, 2014 4,307 $ 21.98 Granted 2,170 44.00 Vested (1,735 ) 19.84 Forfeited (104 ) 63.47 Non-vested shares at December 31, 2015 4,638 $ 32.15 The total fair value of RSUs vested was $34.4 million in 2015 and $28.2 million in 2014. The intrinsic value of the non-vested RSUs was $83.5 million as of December 31, 2015. There were no RSUs granted during 2013. In June 2014, the Company granted an award of 4.5 million RSUs to the Company's CEO (CEO RSUs), which included 1.5 million RSUs that vested immediately upon grant and 3.0 million RSUs that were subject to both a market-based condition and a service condition. The market-based condition was achieved in January 2015. Stock-based compensation expense related to the CEO RSUs was $29.4 million in 2015 and $38.3 million in 2014. At December 31, 2015 , there was $107.8 million of unearned stock-based compensation related to RSUs (including $7.0 million related to the CEO RSUs), which is expected to be recognized over a weighted average period of 2.5 years . Employee stock purchase plan In 2015, employees purchased an aggregate of 436,924 shares under the Company's ESPP at an average price of $26.88 per share. At December 31, 2015 , there was $0.6 million of unearned stock-based compensation related to the ESPP, which is expected to be recognized over 0.1 years. Of the 5.0 million shares authorized for issuance, 4.5 million shares were available for issuance at December 31, 2015. The weighted-average fair value per share for purchase periods beginning in 2015 and 2014 were $15.76 and $7.16 , respectively. Cash proceeds from the issuance of shares under the ESPP were $11.7 million in 2015. Fair value disclosures The fair value of stock options granted and purchases under the Company's ESPP is estimated using the Black-Scholes option pricing model. Expected term of stock options granted was estimated based on the simplified method. Expected stock price volatility was estimated by taking the average historic price volatility for industry peers based on daily price observations over a period equivalent to the expected term. Risk-free interest rate was based on the yields of U.S. Treasury securities with maturities similar to the expected term. Dividend yield was zero as the Company does not have any history of, nor plans to make, dividend payments. The fair value of stock options granted was estimated as of the grant date using the following assumptions: Year ended December 31, 2015 2014 2013 Volatility 43%–54% 54%–56% 56%–60% Expected term (years) 5.5–7.0 5.3–6.3 5.3–6.1 Risk-free interest rate 1.6%–2.0% 1.7%–2.0% 0.8%–2.4% Dividend yield —% —% —% The fair value of stock purchase rights granted under the ESPP was estimated using the following assumptions: Year ended December 31, 2015 2014 Volatility 39%–45% 45.5% Expected term (years) 0.5 0.6 Risk-free interest rate 0.1%–0.2% 0.1% Dividend yield —% —% During 2014, the Company used a Monte Carlo valuation model to calculate the fair value of the CEO RSUs subject to a market condition based on the following assumptions: expected term of 10 years , expected volatility of 50.9% , risk-free interest rate of 2.69% , and a grant date fair value of $18.40 for the underlying shares. Stock-based compensation expense The following table summarizes stock-based compensation included in the consolidated statements of operations: Year ended December 31, (in thousands) 2015 2014 2013 Cost of revenue $ 1,492 $ 835 $ 690 Research and development 18,024 11,640 3,003 Sales and marketing 13,762 10,428 5,670 General and administrative 47,402 48,496 1,524 Total stock-based compensation expense, before income taxes 80,680 71,399 10,887 Total tax benefit recognized (27,971 ) (19,471 ) (1,104 ) Total stock-based compensation expense, net of income taxes $ 52,709 $ 51,928 $ 9,783

Net income per share attributab

Net income per share attributable to common stockholders	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income per share attributable to common stockholders	Net income per share attributable to common stockholders Basic and diluted net income per common share is presented in conformity with the two-class method required for participating securities. The Company considers shares issued upon the early exercise of options subject to repurchase and non-vested restricted shares to be participating securities, because holders of such shares have a non-forfeitable right to dividends. Additionally, prior to the Company's IPO and their conversion, the Company considered its redeemable convertible preferred stock to be participating securities due to their non-cumulative dividend rights. Basic net income per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period. All participating securities are excluded from basic weighted average common shares outstanding. Diluted net income per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders by the weighted-average number of common shares outstanding, including all potentially dilutive common shares. Undistributed earnings are allocated based on the contractual participation rights of Class A and Class B as if the earnings for the year have been distributed. As the liquidation and dividend rights are identical, the undistributed earnings are allocated on a proportionate basis. The computation of the diluted net income per share of Class A common stock assumes the conversion of Class B common stock. The following table presents the calculations of basic and diluted net income per share attributable to common stockholders: Year ended December 31, (in thousands, except per share data) 2015 2014 2013 Class A Class B Class A Class B Numerator: Allocation of net income $ 24,559 $ 11,572 $ 16,647 $ 111,441 $ 60,578 Less: net income allocable to participating securities — — (2,147 ) (14,365 ) (16,727 ) Net income attributable to common stockholders—basic 24,559 11,572 14,500 97,076 43,851 Add: net income allocable to dilutive participating securities — — 2,277 1,981 2,309 Reallocation of net income as a result of conversion of Class B to Class A shares 11,572 97,076 — — Reallocation of net income to Class B shares — 1,974 — 2,237 — Net income attributable to common stockholders—diluted $ 36,131 $ 13,546 $ 113,853 $ 101,294 $ 46,160 Denominator: Weighted-average common shares—basic 91,486 43,109 13,575 90,878 81,018 Conversion of Class B to Class A common stock outstanding 43,109 — 90,878 — — Effect of potentially dilutive shares 11,891 11,810 19,177 19,115 17,923 Weighted-average common shares—diluted 146,486 54,919 123,630 109,993 98,941 Net income per share attributable to common stockholders: Basic $ 0.27 $ 0.27 $ 1.07 $ 1.07 $ 0.54 Diluted $ 0.25 $ 0.25 $ 0.92 $ 0.92 0.47 The following potentially dilutive shares were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive: Year ended December 31, (in thousands) 2015 2014 2013 Redeemable convertible preferred stock — 15,136 30,523 Stock options, ESPP shares, and RSUs 2,680 360 1,409 Unvested restricted stock awards 1 425 380 2,681 15,921 32,312

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income taxes	Income taxes Income before income taxes consisted of the following: Year ended December 31, (in thousands) 2015 2014 2013 Domestic $ 13,562 $ 114,937 $ 57,251 Foreign 39,023 66,038 34,078 $ 52,585 $ 180,975 $ 91,329 Income tax expense consisted of the following: Year ended December 31, (in thousands) 2015 2014 2013 Current: Federal $ 18,548 $ 55,846 $ 28,856 State 3,007 6,075 1,634 Foreign 6,539 8,219 8,058 Total current 28,094 70,140 38,548 Deferred: Federal (11,211 ) (13,551 ) (7,268) State (204 ) (3,369 ) (861) Foreign (225 ) (333 ) 332 Total deferred (11,640 ) (17,253 ) (7,797) Income tax expense $ 16,454 $ 52,887 $ 30,751 Income tax expense for 2015 of $16.5 million decreased $36.4 million from 2014, primarily due to lower pre-tax income. As of December 31, 2015, undistributed earnings of $129.1 million of the Company’s foreign subsidiaries are considered to be indefinitely reinvested and, accordingly, no provision for federal and state income taxes have been provided thereon. The Company intends to reinvest these earnings indefinitely in its foreign subsidiaries. If these earnings were distributed to the United States in the form of dividends or otherwise or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred the Company would be subject to additional U.S. income taxes (subject to adjustment for foreign tax credits) and foreign withholding taxes. We do not intend to repatriate these earnings to fund U.S. operations and, accordingly, we do not provide for U.S. federal income and foreign withholding tax on these earnings. Determination of the amount of unrecognized deferred income tax liability related to these earnings is not practical. Income tax expense reconciles to the amount computed by applying the federal statutory rate of 35% to income before income taxes as follows: Year ended December 31, 2015 2014 2013 (in thousands, except percentage) $ % $ % $ % Reconciliation to statutory rate: Tax at federal statutory rate $ 18,405 35.0 % $ 63,341 35.0 % $ 31,965 35.0 % State taxes, net of federal benefit 1,454 2.8 4,911 2.7 2,344 2.6 Impact of foreign operations 6,434 12.2 (13,305 ) (7.4 ) (113 ) (0.1 ) Stock-based compensation 2,390 4.5 8,050 4.4 2,982 3.3 Tax credits (21,891 ) (41.6 ) (10,616 ) (5.9 ) (5,637 ) (6.2 ) Change in valuation allowance 8,555 16.3 — — — — Other 1,107 2.1 506 0.4 (790 ) (0.9 ) $ 16,454 31.3 % $ 52,887 29.2 % $ 30,751 33.7 % The higher effective tax rate for 2015 compared to 2014 was due to higher U.S. taxable income and lower international taxable income, which resulted from incurring a higher proportion of our 2015 operating expenses in foreign jurisdictions. Additionally, the effective tax rate for 2015 was lower than the federal statutory rate of 35% primarily due to benefits from research and development tax credits. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities were as follows: December 31, (in thousands) 2015 2014 Deferred tax assets: Net operating loss carryforwards $ 339 $ — Tax credit carryforwards 9,372 2,347 Stock-based compensation 19,096 9,950 Allowance for returns 8,812 9,466 Accruals and reserves 20,398 14,484 Total deferred tax assets 58,017 36,247 Valuation allowance (8,555 ) — Total deferred tax assets, net of valuation allowance 49,462 36,247 Deferred tax liabilities: Depreciation and amortization (6,937 ) (3,418 ) Intangible assets (2,904 ) — Total deferred tax liabilities (9,841 ) (3,418 ) Net deferred tax assets $ 39,621 $ 32,829 Recognition of deferred tax assets is appropriate when realization of such assets is more likely than not. Based upon the weight of available evidence, which includes the Company’s historical operating performance and the U.S. cumulative net profits in prior periods and anticipated future earnings, the Company believes it is more likely than not that deferred tax assets, other than California research credit carryforwards, will be realized. The Company's valuation allowance increased by $8.6 million during the year ended December 31, 2015. The change in the 2015 valuation allowance was primarily due to the addition of current year California research credit carryforwards. As of December 31, 2015 , the Company’s federal and state net operating loss carryforwards for income tax purposes were approximately $395.5 million and $249.2 million , and federal and state tax credit carryforwards were approximately $24.2 million and $18.4 million , respectively. All of the Company's federal loss, federal credit and state loss carryforwards and $3.9 million of the state tax credit carryforwards will be recorded to additional paid-in capital when realized. If not utilized, federal loss, federal credit and state loss carryforwards will begin to expire from 2019 to 2035, while the state tax credits may be carried forward indefinitely. If certain substantial changes in the entity's ownership occur, there could be an annual limitation on the amount of the carryforwards that can be utilized. On December 18, 2015, The Consolidated Appropriations Act of 2016 was signed into law, which retroactively reinstated and made permanent the federal research tax credit provisions from January 1, 2015 through December 31, 2015. As a result, the Company recognized an income tax benefit of $13.7 million for federal research credits during the fourth quarter of 2015. In November 2015, the FASB issued ASU 2015-17 which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as noncurrent on the balance sheet. The Company early-adopted this standard as of December 31, 2015 on a prospective basis. The impact to the Company's consolidated balance sheet at December 31, 2015 is a reclassification from current to non-current deferred tax assets of $22.2 million . Uncertain income tax positions As of December 31, 2015, the Company’s total amount of gross unrecognized tax benefits was $36.3 million , which represented an increase in unrecognized tax benefits of $19.7 million during 2015. If recognized, $31.0 million of these unrecognized income tax benefits (net of federal benefit) would be recorded as a reduction of future income tax provision. A reconciliation of the beginning and ending amount of the unrecognized income tax benefits during the tax periods ending December 31, 2015, 2014 and 2013 are as follows: December 31, (in thousands) 2015 2014 2013 Gross balance at January 1 $ 16,558 $ 9,898 $ 4,439 Gross increase related to current year tax positions 19,948 6,401 5,280 Gross increase related to prior year tax positions 108 259 179 Gross decrease related to prior year tax positions (341) — 0 $ 36,273 $ 16,558 $ 9,898 The Company’s policy is to account for interest and penalties as income tax expense. As of December 31, 2015 and 2014 , the Company had accrued interest and penalties of approximately $0.2 million and $0.2 million related to unrecognized tax benefits. There were no accrued interest and penalties as of December 31, 2013. It is reasonably possible that the total amounts of unrecognized tax benefits will significantly increase within the next 12 months. However, the range of the reasonably possible change cannot be reliably estimated. The Company files income tax returns in the U.S. and non-U.S. jurisdictions. The Company is subject to U.S. income tax examinations for calendar tax years ending 2011 through 2014, and foreign income tax examinations from 2013 through 2014. The U.S. federal and U.S. state taxing authorities may choose to audit tax returns for tax years beyond the statute of limitation period due to tax attribute carryforwards from prior years, making adjustments only to carryforward attributes. The Company is currently under examination by the Internal Revenue Service for the 2012 through 2014 tax years and California Franchise Tax Board for the 2011 and 2012 tax years. At this time, the Company is not able to estimate the potential impact that the examination may have on income tax expense. If the examinations are resolved unfavorably, there is a possibility it may have a material negative impact on the Company's results of operations.

Related parties

Related parties	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related parties	Related parties The Company has agreements for certain contract manufacturing and engineering services with a vendor affiliated with one of the Company's investors. The Company made payments of $0.2 million , $12.2 million and $3.6 million in 2015, 2014 and 2013, respectively, for services rendered. As of December 31, 2015 and 2014, the Company had accounts payable associated with this vendor of zero and $0.1 million , respectively. The Company incurs costs for company-related chartered aircraft fees for the use of the CEO’s private plane. The Company made payments of $1.0 million and $0.5 million in 2015 and 2014, respectively. As of December 31, 2015 and 2014, the Company had accounts payable associated with this vendor of $0.1 million and $0.4 million , respectively. In May 2014, the Company amended the outstanding stock options granted to the former Chief Financial Officer to facilitate the net exercise of those options and subsequently repurchased 41,154 shares of common stock from the former Chief Financial Officer's estate at a purchase price of $18.40 per share. In June 2014, the CEO purchased seven automobiles from the Company for a total purchase price of $0.3 million , which was equal to the deemed fair value of the automobiles purchased. There have been no additional such purchases in 2015. In 2013, the Company entered into a three -year agreement, which was amended in August 2015, with a company affiliated with the son of one of the members of the Company's board of directors to acquire certain naming rights to a kart racing facility. As consideration for these naming rights, the Company would pay a total of $0.5 million over the three year period. As of December 31, 2015 , the Company has made cumulative payments of $0.5 million and has also provided 100 GoPro capture devices at no cost each year. In the second quarter of 2013, the Company settled an outstanding legal matter with one of the CEO's family members for $0.2 million and loaned one of its executive officers $0.2 million pursuant to a demand payment loan that did not bear interest, which was fully repaid in March 2014. See Notes 5 and 6 above for information regarding CEO RSUs and common stock contributed by the CEO back to the Company.

Commitments, contingencies and

Commitments, contingencies and guarantees	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, contingencies and guarantees	Commitments, contingencies and guarantees The following table summarizes the Company’s contractual commitments as of December 31, 2015 : (in thousands) Total 2016 2017 2018 2019 2020 Thereafter Operating leases (1) $ 152,237 $ 16,597 $ 15,783 $ 19,582 $ 13,151 $ 16,602 $ 70,522 Sponsorship commitments (2) 19,186 9,889 3,986 2,591 2,720 — — Other contractual commitments (3) 4,574 3,153 1,421 — — — — Capital equipment purchase commitments (4) 5,086 5,086 — — — — — Total contractual cash obligations $ 181,083 $ 34,725 $ 21,190 $ 22,173 $ 15,871 $ 16,602 $ 70,522 (1) The Company leases its facilities under long-term operating leases, which expire at various dates through 2027. (2) The Company sponsors events, resorts and athletes as part of its marketing efforts. In many cases, the Company enters into multi-year agreements with event organizers, resorts and athletes. (3) The Company purchases software licenses related to its financial and IT systems which require payments over multiple years. (4) The Company enters into contracts to acquire equipment for tooling and molds as part of its manufacturing operations. In addition, the Company incurs purchase commitments related to the manufacturing of its point-of-purchase (POP) displays by third parties. Rent expense was $12.2 million , $7.3 million and $3.9 million in 2015, 2014 and 2013, respectively. Legal proceedings From time to time, the Company is involved in legal proceedings in the ordinary course of business. The Company believes that the outcome of any existing litigation, either individually or in the aggregate, will not have a material impact on the results of operations, financial condition or cash flows of the Company. Indemnifications In the normal course of business, the Company enters into agreements that contain a variety of representations and warranties and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. It is not possible to determine the maximum potential amount under these indemnification agreements due to the Company’s limited history with indemnification claims and the unique facts and circumstances involved in each particular agreement. As of December 31, 2015 , the Company has not paid any claims or 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. Product warranty The following table summarizes the warranty liability activity: Year ended December 31, (in thousands) 2015 2014 2013 Beginning balances $ 6,405 $ 3,870 $ 1,937 Charged to cost of revenue 25,377 10,268 7,380 Settlements of warranty claims (20,926 ) (7,733 ) (5,447) Ending balances $ 10,856 $ 6,405 $ 3,870 At December 31, 2015 , $10.4 million of the warranty liability was recorded as an element of accrued liabilities and $0.5 million was recorded as an element of other long-term liabilities. As of December 31, 2014, $6.0 million of the warranty liability was recorded as an element of accrued liabilities and $0.4 million was recorded as an element of other long-term liabilities.

Concentrations of risk and segm

Concentrations of risk and segment information	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Concentrations of risk and segment information	Concentrations of risk and geographic information Customer concentration Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables. The Company believes that credit risk in its 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 had the following customers who represented 10% or more of its net accounts receivable balance as of the dates indicated: December 31, December 31, Customer A 40% 17% Customer B 18% 11% Customer C * 14% * Less than 10% of total accounts receivable for the period indicated The following table summarizes the Company's accounts receivables sold, without recourse, and factoring fees paid: Year ended December 31, (in thousands) 2015 2014 2013 Accounts receivable sold $ 194,223 $ 250,437 $ 71,066 Factoring fees 1,566 2,148 591 Customers with revenue greater than 10% of the Company's total revenue were as follows: Year ended December 31, 2015 2014 2013 Customer D 14% 20% 17% Customer A 12% * * * Less than 10% of total revenue for the period indicated Supplier concentration The Company relies on third parties for the supply and manufacture of its capture devices, some of which are sole-source suppliers. The Company believes that outsourcing manufacturing enables greater scale and flexibility. As demand and product lines change, the Company periodically evaluates the need and advisability of adding manufacturers to support its operations. In instances where a supply and manufacture agreement does not exist or suppliers fail to perform their obligations, the Company may be unable to find alternative suppliers or satisfactorily deliver its products to its customers on time, if at all. The Company also relies on third parties with whom it outsources supply chain activities related to inventory warehousing, order fulfillment, distribution and other direct sales logistics . Geographic and other information Revenue by geographic region, based on ship-to destinations, was as follows: Year ended December 31, (in thousands) 2015 2014 2013 Americas $ 868,772 $ 890,352 $ 557,285 Europe, Middle East and Africa (EMEA) 535,260 371,197 322,226 Asia and Pacific area countries (APAC) 215,939 132,656 106,226 $ 1,619,971 $ 1,394,205 $ 985,737 Revenue in the United States, which is included in the Americas geographic region, was $769.2 million , $796.0 million and $498.5 million in 2015, 2014 and 2013 , respectively. In 2014, the Company reclassified four countries it had previously included in the APAC geographical region to be included in the EMEA geographical region. This caused $19.3 million and $10.6 million of revenue to be reclassified from the APAC region to the EMEA region in 2014 and 2013, respectively. The Company does not disclose revenue by product category as it does not track sales incentives and other revenue adjustments by product category to report such data. As of December 31, 2015 , 2014 and 2013, long-lived assets, which represent gross property and equipment, located outside the United States, primarily in China, were $47.6 million , $25.4 million and $6.0 million , respectively.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent events (unaudited) On February 25, 2016, the Company entered into definitive agreements to acquire two privately-held companies that offer mobile video editing applications. The aggregate purchase consideration includes cash consideration of approximately $105 million as well as certain deferred consideration subject to specified future employment conditions. The transactions are expected to close in the first half of 2016, subject to the satisfaction of customary closing conditions.

Schedule II (Notes)

Schedule II (Notes)	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Schedule of Valuation and Qualifying Accounts	VALUATION AND QUALIFYING ACCOUNTS For the years ended December 31, 2015, 2014 and 2013 (in thousands) Balance at Beginning of Year Charges to Revenue Charges to Expense Deductions/Write-offs Balance at End of Year Allowance for doubtful accounts receivable: Year ended December 31, 2015 $ 1,250 $ — $ 682 $ (532 ) $ 1,400 Year ended December 31, 2014 520 — 970 (240 ) 1,250 Year ended December 31, 2013 262 — 663 (405 ) 520 Allowance for sales returns: Year ended December 31, 2015 $ 25,747 $ 48,182 $ (47,649 ) $ — $ 26,280 Year ended December 31, 2014 14,352 39,011 (27,616 ) — 25,747 Year ended December 31, 2013 9,077 24,156 (18,881 ) — 14,352 Valuation allowance for deferred tax assets: Year ended December 31, 2015 $ — $ — $ 8,555 $ — $ 8,555

Summary of significant accoun21

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). The Company's fiscal year ends on December 31, and its fiscal quarters end on March 31, June 30, and September 30.
Principles of consolidation	Principles of consolidation. These consolidated financial statements include all the accounts of the Company and its wholly-owned subsidiaries. Unless otherwise specified, references to the Company are references to GoPro, Inc. and its consolidated subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of estimates	Use of estimates. The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the Company’s consolidated financial statements and accompanying notes. The Company bases its estimates and assumptions on historical experience and on various other factors that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ materially from management's estimates. To the extent there are material differences between the estimates and the actual results, future results of operations could be affected.
Comprehensive income	Comprehensive income. For all periods presented, comprehensive income approximated net income. Therefore, the consolidated statements of comprehensive income have been omitted
Prior period reclassifications	Prior period reclassifications. Reclassifications of certain prior period amounts in the consolidated financial statements have been made to conform to the current period presentation.
Cash and equivalents and marketable securities	Cash equivalents and marketable securities. Cash equivalents primarily consist of investments in money market funds with maturities of three months or less from the date of purchase. Marketable securities consist of commercial paper, U.S. treasury securities, U.S. agency securities, and corporate debt securities, and are classified as available-for-sale securities. As the Company views these securities as available to support current operations, it has classified all available-for-sale securities as current assets. Available-for-sale securities are carried at fair value with unrealized gains and losses, if any, included in stockholders' equity. As of December 31, 2015 , the Company's marketable securities were recorded at their amortized cost which approximated fair value. Unrealized losses are charged against other income (expense), net, for declines in fair value below the cost of an individual investment that is deemed to be other than temporary. The Company did not identify any marketable securities as other-than-temporarily impaired for the periods presented. The Company determines realized gains or losses on sale of marketable securities on a specific identification method, and records such gains or losses as other income (expense), net.
Accounts receivables and allowance for doubtful accounts	Accounts receivable and allowance for doubtful accounts. Accounts receivable are stated at invoice value less estimated allowances for returns and doubtful accounts. The Company records allowances based upon its assessment of various factors, such as: historical experience, credit quality of its customers, age of the accounts receivable balances, geographic related risks, economic conditions and other factors that may affect a customer’s ability to pay. The allowance for doubtful accounts as of December 31, 2015 and 2014 was $1.4 million and $1.3 million , respectively.
Inventory	Inventory. Inventory consists of finished goods and component parts, which are purchased directly or from contract manufacturers. Inventory is stated at the lower of cost or market on a first-in, first-out basis. The Company writes down its inventory for estimated obsolescence or excess inventory equal to the difference between the cost of inventory and estimated market value. The Company’s assessment of market value is based upon assumptions around market conditions and estimated future demand for its products within a specified time horizon, generally 12 months . Adjustments to reduce inventory to net realizable value are recognized in cost of revenue in the current period.
Point of purchase (POP) displays	Point of purchase (POP) displays. The Company provides retailers with POP displays, generally free of charge, in order to facilitate the marketing of the Company’s products within retail stores. The POP displays contain a display that broadcasts video images taken by GoPro cameras with product placement available for cameras and accessories. POP display costs, less any fees charged, are capitalized as long-term assets and charged to sales and marketing expense over the expected period of benefit, which generally ranges from 24 to 36 months .
Property and equipment, net	Property and equipment, net. Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful life of the assets, ranging from one to ten years. Leasehold improvements are amortized over the shorter of the lease term or their expected useful life. Property and equipment pending installation, configuration or qualification are classified as construction in progress. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred.
Income taxes	Income taxes. The Company utilizes the asset and liability method for computing its income tax provision, under which deferred tax assets and liabilities are recognized for the expected future consequences of temporary differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates. Management makes estimates, assumptions and judgments to determine the Company's provision for income taxes, deferred tax assets and liabilities, and any valuation losses recorded against deferred tax assets. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income and, to the extent the Company believes recovery is not likely, establishes a valuation allowance. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. Interest and penalties related to unrecognized tax benefits are recognized within income tax expense.
Fair value measurement	Fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the reporting date. The Company estimates and categorizes the fair value of its financial assets by applying the following hierarchy established by the FASB, which prioritizes the inputs to valuation techniques used to measure fair value: Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to directly access. Level 2 Valuations based on quoted prices for similar assets or liabilities; valuations for interest-bearing securities based on non-daily quoted prices in active markets; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. Level 3 Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. A financial instrument's level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The fair value of Level 2 financial instruments is obtained from an independent pricing service, which may use quoted market prices for identical or comparable instruments or model driven valuations using observable market data or inputs corroborated by observable market data.
Leases	Leases. The Company leases its office space and facilities under cancelable and non-cancelable operating leases. For leases that contain rent escalation or rent concession provisions, the Company recognizes rent expense on a straight-line basis over the term of the lease. The Company does not assume renewals in its determination of the lease term unless the renewals are deemed to be reasonably assured at lease inception. Leasehold improvements are included in property and equipment, net.
Goodwill and other intangible assets	Goodwill and other intangible assets . Goodwill represents the excess of the purchase price over the fair value of the net assets acquired in a business combination. Acquired intangible assets other than goodwill are amortized over their useful lives unless the lives are determined to be indefinite. For intangible assets acquired in a business combination, the estimated fair values of the assets received are used to establish their recorded values. Valuation techniques consistent with the market approach, income approach and/or cost approach are used to measure fair value.
Impairment of goodwill	Impairment of goodwill and long-lived assets. The Company performs an annual assessment of its goodwill during the fourth quarter of each calendar year and in interim periods if certain events occur to determine if any events or circumstances exist, such as an adverse change in business climate or a decline in the overall industry demand, that would indicate it is more likely than not that the fair value of its single reporting unit is less than its carrying value. If further testing is deemed necessary, a two-step approach is applied. The first step involves comparing the fair value of the reporting unit with its carrying value. The second step, if necessary, measures the amount of impairment, if any, by comparing the carrying value of the goodwill to its implied fair value. Other indefinite-lived intangible assets are assessed for impairment at least annually. If their value carrying value exceeds the estimated fair value, the difference is recorded as an impairment. Long-lived assets, such as property and equipment and intangible assets subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated future undiscounted cash flows expected to be generated by the asset group. If it is determined that an asset group is not recoverable, an impairment charge is recognized for the amount by which the carrying amount of the asset group exceeds its fair value. There was no material impairment of goodwill, indefinite-lived intangible assets or other long-lived assets for any periods presented.
Impairment of long-lived assets	Impairment of goodwill and long-lived assets. The Company performs an annual assessment of its goodwill during the fourth quarter of each calendar year and in interim periods if certain events occur to determine if any events or circumstances exist, such as an adverse change in business climate or a decline in the overall industry demand, that would indicate it is more likely than not that the fair value of its single reporting unit is less than its carrying value. If further testing is deemed necessary, a two-step approach is applied. The first step involves comparing the fair value of the reporting unit with its carrying value. The second step, if necessary, measures the amount of impairment, if any, by comparing the carrying value of the goodwill to its implied fair value. Other indefinite-lived intangible assets are assessed for impairment at least annually. If their value carrying value exceeds the estimated fair value, the difference is recorded as an impairment. Long-lived assets, such as property and equipment and intangible assets subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated future undiscounted cash flows expected to be generated by the asset group. If it is determined that an asset group is not recoverable, an impairment charge is recognized for the amount by which the carrying amount of the asset group exceeds its fair value. There was no material impairment of goodwill, indefinite-lived intangible assets or other long-lived assets for any periods presented.
Warranty	Warranty. The Company records a liability for estimated product warranty costs at the time product revenue is recognized. The Company's standard warranty obligation to its end-users generally provides a 12 -month warranty coverage on all of its products except in the European Union where the Company provides a two -year warranty. The Company's estimate of costs to service its warranty obligations is based on its historical experience of repair and replacement of the associated products and expectations of future conditions. The warranty obligation is affected by product failure rates and the related use of materials, labor costs and freight incurred in correcting any product failure.
Revenue recognition	Revenue recognition. Revenue is primarily comprised of product revenue, net of returns and sales incentives. The Company derives substantially all of its revenue from the sale of capture devices and the related implied post contract support (PCS). The Company recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, and collectability is reasonably assured. Evidence of an arrangement consists of an order from its distributors, resellers, or online customers. The Company considers delivery to have occurred once title and risk of loss has been transferred. For most of the Company's revenue, these criteria are met at the time the product is shipped. For customers who purchase products directly from the Company’s website, the Company defers revenue until delivery to the customer's address because the Company retains a portion of the risk of loss on these sales during transit. Customer deposits are included in accrued liabilities on the consolidated balance sheet and are recognized as revenue when all the revenue recognition criteria are met. The Company grants limited rights to return product for certain large retailers and distributors. The Company records reductions to revenue and cost of sales for expected future product returns at the time of sale based on analyses of historical return trends by customer class. Return trends are influenced by product life cycles, new product introductions, market acceptance of products, product sell-through, the type of customer, seasonality, and other factors. Return rates may fluctuate over time, but are sufficiently predictable to allow the Company to estimate expected future product returns. The Company has determined its sales of capture devices are multiple element arrangements that generally include the following two units of accounting: a) the hardware component (camera and accessories) and the embedded firmware essential to the functionality of the camera delivered at the time of sale, and b) the implied right for the customer to receive PCS. PCS includes the right to receive, on a when and if available basis, future unspecified firmware upgrades and features as well as bug fixes, email and telephone support. The Company accounts for each element separately and allocates revenue based on their relative selling prices. The Company uses a hierarchy to determine the selling price to be used for allocating revenue to deliverables: (i) vendor-specific objective evidence of fair value (VSOE), (ii) third-party evidence of selling price (TPE) and (iii) best estimate of the selling price (BESP). The Company has neither VSOE nor TPE since the deliverables are not sold separately and there are not comparable deliverables sold by other companies. BESP reflects the Company’s best estimates of what the selling prices of elements would be if they were sold regularly on a stand-alone basis. The Company's process for determining BESP considers multiple factors that may vary over time depending upon the unique facts and circumstances related to each deliverable, including: the level of support provided to customers, estimated costs to provide the Company's support, the amount of time and cost that is allocated to the Company's efforts to develop the undelivered elements, and market trends in the pricing for similar offerings. Revenue allocated to the delivered hardware and the related essential software is recognized at the time of sale provided the conditions for recognition of revenue have been met. Revenue allocated to PCS is deferred and recognized on a straight-line basis over the estimated term of the support period, which is estimated to be 15 months based on historical experience.
Sales incentives	Sales incentives. The Company offers sales incentives through various programs, consisting primarily of cooperative advertising and marketing development fund programs. The Company records cooperative advertising and marketing development fund programs with customers as a reduction to revenue unless it receives an identifiable benefit in exchange for credits claimed by the customer and can reasonably estimate the fair value of the identifiable benefit received, in which case the Company will record it as a marketing expense. Marketing development funds recorded as marketing expense were not material for the periods presented. In addition, the Company offers price protection discounts to certain customers when new capture device models are released or repriced and the customer has remaining inventory on hand. The Company calculates price protection discounts in the period that the price reduction goes into effect, and they are recorded as a reduction of revenue, based on the evaluation of inventory currently held by the customer subject to price protection.
Shipping costs	Shipping costs. Amounts billed to customers for shipping and handling are classified as revenue and the Company's related shipping and handling costs incurred are classified as cost of revenue.
Sales taxes	Sales taxes. Sales taxes collected from customers and remitted to respective governmental authorities are recorded as liabilities and not included in revenue.
Research and development	Research and development. Research and development expense includes internal and external costs. Internal costs include employee related expenses, equipment costs, depreciation expense and allocated facility costs. External research and development expenses consist of costs associated with consultants, tooling and prototype materials. Research and development expense is related to developing new products and services and the designing of significant improvements to existing products. Research and development costs to establish the technological feasibility of the Company’s internally developed software is expensed as incurred. To date, the period between achieving technological feasibility and the release of internally developed software to be sold, leased, or marketed has been short and development costs qualifying for capitalization have been insignificant.
Advertising costs	Advertising costs. Advertising costs consist of costs associated with print, television and ecommerce media advertisements and are expensed as incurred. The Company incurs promotional expenses resulting from payments under event, resort and athlete sponsorship contracts. These sponsorship arrangements are considered to be executory contracts and, as such, the costs are expensed as performance under the contract is received. The costs associated with preparation of sponsorship activities, including the supply of GoPro products, media team support, and activation fees are expensed as incurred. Prepayments made under sponsorship agreements are included in prepaid expenses or other long-term assets depending on the period to which the prepayment applies. Advertising costs were $64.7 million , $47.2 million and $55.5 million in 2015, 2014 and 2013, respectively.
Share-based compensation	Stock-based compensation. The Company accounts for stock-based compensation in accordance with accounting guidance that requires all stock-based awards granted to employees and directors to be measured at fair value and recognized as an expense. The Company primarily issues restricted stock units. For service-based awards, stock-based compensation is recognized on a straight-line basis over the requisite service period, net of estimated forfeitures. For performance and market-based awards which also require a service period, the Company uses graded vesting over the longer of the derived service period or when the performance or market condition is satisfied. The Company recognizes a benefit from stock-based compensation as additional paid-in capital if an excess tax benefit is realized by following the with-and-without approach. The indirect effects of stock-based compensation deductions are reflected in the income tax provision for purposes of measuring the excess tax benefit at settlement of awards.
Foreign currency	Foreign currency. The U.S. dollar is the functional currency of the Company's foreign subsidiaries. The Company remeasures monetary assets or liabilities denominated in currencies other than the U.S. dollar using exchange rates prevailing on the balance sheet date, and non-monetary assets and liabilities at historical rates. Foreign currency remeasurement and transaction gains and losses are included in other expense, net and have not been material for any periods presented.
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 CEO, who is the Company’s chief operating decision maker.
Recent accounting pronouncements	Recent accounting pronouncements Standard Description Date of adoption Effect on the financial statements or other significant matters Standards that are not yet adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606) This standard is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products and services are transferred to customers. In August 2015, the FASB deferred the effective date by one year while providing the option to adopt the standard on the original effective date of January 1, 2017. The standard may be adopted either retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. January 1, 2018 The Company is currently evaluating the impact the adoption of this standard will have on its consolidated financial statements and related disclosures. ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement Period Adjustments Under the updated guidance, the acquirer in a business combination is required to recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. This new standard will be applied prospectively to adjustments to provisional amounts that occur after the effective date of this update. January 1, 2016 The Company does not believe the adoption of this standard will have a material impact to its consolidated financial statements. Standards that were adopted ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classifications of Deferred Taxes This standard requires that deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance becomes effective for the Company on January 1, 2017, with early adoption permitted. December 31, 2015 The Company early adopted this standard, prospectively. Adoption resulted in a $22.2 million reduction to current assets and a corresponding increase in other long-term assets at December 31, 2015. Prior periods were not adjusted. Adoption had no impact on the Company’s results of operations.

Consolidated financial statem22

Consolidated financial statement details (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Inventory	December 31, (in thousands) 2015 2014 Components $ 9,476 $ 4,324 Finished goods 178,756 148,702 Total inventory $ 188,232 $ 153,026
Schedule of Prepaid expenses and Other current assets	December 31, (in thousands) 2015 2014 Prepaid expenses $ 6,132 $ 3,905 Prepaid income taxes 4,696 26,504 Tenant allowance receivable 4,249 — Prepaid licenses 2,818 2,053 Current deferred tax assets — 24,218 Other current assets 7,366 7,089 Prepaid expenses and other current assets $ 25,261 $ 63,769
Property, Plant and Equipment	(dollars in thousands) Useful life (in years) December 31, December 31, Leasehold improvements 3–10 $ 40,841 $ 22,787 Production, engineering and other equipment 4 25,174 8,755 Tooling 1–2 19,537 16,159 Computers and software 2 14,581 9,731 Furniture and office equipment 3 11,389 6,150 Construction in progress 4,632 3,944 Tradeshow equipment and other 2-5 4,136 3,830 Gross property and equipment 120,290 71,356 Less: Accumulated depreciation and amortization (50,240 ) (29,800) Property and equipment, net $ 70,050 $ 41,556
Schedule of Business Acquisitions	The following table summarizes the allocation of the fair values of the assets acquired and liabilities assumed, and the related useful lives, where applicable: (in thousands) Estimated Fair value Purchased technology 4 - 6 years $ 25,676 In-process research and development (IPR&D) 6,600 Net liabilities assumed (353 ) Deferred income tax liabilities (4,676 ) Net assets acquired 27,247 Goodwill 43,000 Total fair value consideration $ 70,247
Schedule of Finite-Lived Intangible Assets	The following table summarizes the Company's acquired intangible assets: December 31, 2015 (in thousands) Gross carrying value Accumulated amortization Net carrying value Purchased technology and other amortizable assets $ 32,952 $ (8,540 ) $ 24,412 IPR&D and other non-amortizable assets 6,615 — 6,615 Total intangible assets $ 39,567 $ (8,540 ) $ 31,027 December 31, 2014 (in thousands) Gross carrying value Accumulated Net carrying value Purchased technology and other amortizable assets $ 7,275 $ (4,353 ) $ 2,922 Other non-amortizable assets 15 — 15 Total intangible assets $ 7,290 $ (4,353 ) $ 2,937
Schedule of Future Amortization	stimated amortization expense of existing intangible assets for future periods is as follows: (in thousands) Total Year ending December 31, 2016 $ 5,956 2017 5,172 2018 4,780 2019 4,269 2020 3,365 Thereafter 870 $ 24,412
Schedule of Other long-term assets	December 31, (in thousands) 2015 2014 POP displays $ 27,989 $ 18,743 Long-term deferred tax assets 41,936 8,611 Income tax receivable 33,206 — Deposits and other 8,430 8,706 Other long-term assets $ 111,561 $ 36,060
Schedule of Accrued Liabilities	December 31, (in thousands) 2015 2014 Accrued payables $ 64,831 $ 56,617 Excess purchase order commitments 38,477 447 Accrued sales incentive 29,298 9,635 Employee related liabilities 26,491 28,959 Warranty liability 10,400 6,025 Customer deposits 8,877 4,903 Income taxes payable 7,536 2,732 Other 6,536 9,189 Accrued liabilities $ 192,446 $ 118,507

Fair value measurements (Tables

Fair value measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy are summarized as follows: December 31, 2015 December 31, 2014 (in thousands) Level 1 Level 2 Total Level 1 Level 2 Total Cash equivalents (1) : Money market funds $ 51,059 $ — $ 51,059 $ 80,968 $ — $ 80,968 Corporate debt securities — — — — 2,000 2,000 Total cash equivalents $ 51,059 $ — $ 51,059 $ 80,968 $ 2,000 $ 82,968 Marketable securities: U.S. treasury securities $ — $ — $ — $ 1,994 $ — $ 1,994 U.S. agency securities — 14,451 14,451 — 7,020 7,020 Commercial paper — 2,197 2,197 — 2,497 2,497 Corporate debt securities — 165,825 165,825 — 90,816 90,816 Municipal securities — 11,913 11,913 — — — Total marketable securities $ — $ 194,386 $ 194,386 $ 1,994 $ 100,333 $ 102,327 (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheets as of December 31, 2015 and 2014. Cash balances were $228.6 million and $237.0 million as of December 31, 2015 and 2014, respectively.
Available-for-sale Securities	available-for-sale marketable securities as of the period-ends noted, are as follows: December 31, (in thousands) 2015 2014 Less than one year $ 122,199 $ 58,764 Greater than one year but less than two years 72,187 43,563 Total $ 194,386 $ 102,327

Stockholders' equity (deficit24

Stockholders' equity (deficit) and redeemable convertible preferred stock (Tables)	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	The Company had the following shares of common stock reserved for issuance upon the exercise of equity instruments as of December 31, 2015 : (in thousands) December 31, 2015 Stock options outstanding 13,081 Restricted stock units outstanding 4,638 Common stock available for future grants 20,084 Total common stock shares reserved for issuance 37,803

Employee benefit plans (Tables)

Employee benefit plans (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of the Company’s stock option activity in 2015 and related information is as follows: Options outstanding (shares in thousands) Shares Weighted- average Weighted- Aggregate Outstanding at December 31, 2014: 25,134 $ 6.62 7.09 $ 1,425,339 Granted 792 39.66 Exercised (12,375 ) 2.01 Forfeited/Cancelled (470 ) 38.84 Outstanding at December 31, 2015: 13,081 $ 11.82 6.70 $ 108,846 Exercisable at December 31, 2015 8,449 $ 6.19 5.89 $ 103,696 Vested and expected to vest at December 31, 2015 12,858 $ 11.62 6.67 $ 108,681
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	A summary of the Company's RSA activity in 2015 is as follows: Shares (in thousands) Weighted- Aggregate (in thousands) Non-vested shares at December 31, 2014 17 $ 6.30 $ 1,017 Vested (17) Non-vested shares at December 31, 2015 —
Schedule of Share-based Compensation, Restricted Stock Units Award Activity	A summary of the Company’s RSU activity in 2015 and 2014 is as follows: (shares in thousands) Shares Weighted- average grant date fair value Non-vested shares at December 31, 2013 270 $ 1.52 Granted 5,573 22.01 Vested (1,533 ) 18.42 Forfeited (3 ) 57.73 Non-vested shares at December 31, 2014 4,307 $ 21.98 Granted 2,170 44.00 Vested (1,735 ) 19.84 Forfeited (104 ) 63.47 Non-vested shares at December 31, 2015 4,638 $ 32.15
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The fair value of stock options granted was estimated as of the grant date using the following assumptions: Year ended December 31, 2015 2014 2013 Volatility 43%–54% 54%–56% 56%–60% Expected term (years) 5.5–7.0 5.3–6.3 5.3–6.1 Risk-free interest rate 1.6%–2.0% 1.7%–2.0% 0.8%–2.4% Dividend yield —% —% —%
Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]	The fair value of stock purchase rights granted under the ESPP was estimated using the following assumptions: Year ended December 31, 2015 2014 Volatility 39%–45% 45.5% Expected term (years) 0.5 0.6 Risk-free interest rate 0.1%–0.2% 0.1% Dividend yield —% —%
Allocation of Stock-based Compensation Expense	The following table summarizes stock-based compensation included in the consolidated statements of operations: Year ended December 31, (in thousands) 2015 2014 2013 Cost of revenue $ 1,492 $ 835 $ 690 Research and development 18,024 11,640 3,003 Sales and marketing 13,762 10,428 5,670 General and administrative 47,402 48,496 1,524 Total stock-based compensation expense, before income taxes 80,680 71,399 10,887 Total tax benefit recognized (27,971 ) (19,471 ) (1,104 ) Total stock-based compensation expense, net of income taxes $ 52,709 $ 51,928 $ 9,783

Net income per share attribut26

Net income per share attributable to common stockholders (Tables)	12 Months Ended
	Dec. 31, 2015
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 per share attributable to common stockholders: Year ended December 31, (in thousands, except per share data) 2015 2014 2013 Class A Class B Class A Class B Numerator: Allocation of net income $ 24,559 $ 11,572 $ 16,647 $ 111,441 $ 60,578 Less: net income allocable to participating securities — — (2,147 ) (14,365 ) (16,727 ) Net income attributable to common stockholders—basic 24,559 11,572 14,500 97,076 43,851 Add: net income allocable to dilutive participating securities — — 2,277 1,981 2,309 Reallocation of net income as a result of conversion of Class B to Class A shares 11,572 97,076 — — Reallocation of net income to Class B shares — 1,974 — 2,237 — Net income attributable to common stockholders—diluted $ 36,131 $ 13,546 $ 113,853 $ 101,294 $ 46,160 Denominator: Weighted-average common shares—basic 91,486 43,109 13,575 90,878 81,018 Conversion of Class B to Class A common stock outstanding 43,109 — 90,878 — — Effect of potentially dilutive shares 11,891 11,810 19,177 19,115 17,923 Weighted-average common shares—diluted 146,486 54,919 123,630 109,993 98,941 Net income per share attributable to common stockholders: Basic $ 0.27 $ 0.27 $ 1.07 $ 1.07 $ 0.54 Diluted $ 0.25 $ 0.25 $ 0.92 $ 0.92 0.47
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: Year ended December 31, (in thousands) 2015 2014 2013 Redeemable convertible preferred stock — 15,136 30,523 Stock options, ESPP shares, and RSUs 2,680 360 1,409 Unvested restricted stock awards 1 425 380 2,681 15,921 32,312

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	Income before income taxes consisted of the following: Year ended December 31, (in thousands) 2015 2014 2013 Domestic $ 13,562 $ 114,937 $ 57,251 Foreign 39,023 66,038 34,078 $ 52,585 $ 180,975 $ 91,329
Schedule of Components of Income Tax Expense (Benefit)	Income tax expense consisted of the following: Year ended December 31, (in thousands) 2015 2014 2013 Current: Federal $ 18,548 $ 55,846 $ 28,856 State 3,007 6,075 1,634 Foreign 6,539 8,219 8,058 Total current 28,094 70,140 38,548 Deferred: Federal (11,211 ) (13,551 ) (7,268) State (204 ) (3,369 ) (861) Foreign (225 ) (333 ) 332 Total deferred (11,640 ) (17,253 ) (7,797) Income tax expense $ 16,454 $ 52,887 $ 30,751
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense reconciles to the amount computed by applying the federal statutory rate of 35% to income before income taxes as follows: Year ended December 31, 2015 2014 2013 (in thousands, except percentage) $ % $ % $ % Reconciliation to statutory rate: Tax at federal statutory rate $ 18,405 35.0 % $ 63,341 35.0 % $ 31,965 35.0 % State taxes, net of federal benefit 1,454 2.8 4,911 2.7 2,344 2.6 Impact of foreign operations 6,434 12.2 (13,305 ) (7.4 ) (113 ) (0.1 ) Stock-based compensation 2,390 4.5 8,050 4.4 2,982 3.3 Tax credits (21,891 ) (41.6 ) (10,616 ) (5.9 ) (5,637 ) (6.2 ) Change in valuation allowance 8,555 16.3 — — — — Other 1,107 2.1 506 0.4 (790 ) (0.9 ) $ 16,454 31.3 % $ 52,887 29.2 % $ 30,751 33.7 %
Schedule of Deferred Tax Assets and Liabilities	Significant components of the Company’s deferred tax assets and liabilities were as follows: December 31, (in thousands) 2015 2014 Deferred tax assets: Net operating loss carryforwards $ 339 $ — Tax credit carryforwards 9,372 2,347 Stock-based compensation 19,096 9,950 Allowance for returns 8,812 9,466 Accruals and reserves 20,398 14,484 Total deferred tax assets 58,017 36,247 Valuation allowance (8,555 ) — Total deferred tax assets, net of valuation allowance 49,462 36,247 Deferred tax liabilities: Depreciation and amortization (6,937 ) (3,418 ) Intangible assets (2,904 ) — Total deferred tax liabilities (9,841 ) (3,418 ) Net deferred tax assets $ 39,621 $ 32,829
Summary of Income Tax Contingencies	A reconciliation of the beginning and ending amount of the unrecognized income tax benefits during the tax periods ending December 31, 2015, 2014 and 2013 are as follows: December 31, (in thousands) 2015 2014 2013 Gross balance at January 1 $ 16,558 $ 9,898 $ 4,439 Gross increase related to current year tax positions 19,948 6,401 5,280 Gross increase related to prior year tax positions 108 259 179 Gross decrease related to prior year tax positions (341) — 0 $ 36,273 $ 16,558 $ 9,898

Commitments, contingencies an28

Commitments, contingencies and guarantees (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of the Company's Contractual Commitments	The following table summarizes the Company’s contractual commitments as of December 31, 2015 : (in thousands) Total 2016 2017 2018 2019 2020 Thereafter Operating leases (1) $ 152,237 $ 16,597 $ 15,783 $ 19,582 $ 13,151 $ 16,602 $ 70,522 Sponsorship commitments (2) 19,186 9,889 3,986 2,591 2,720 — — Other contractual commitments (3) 4,574 3,153 1,421 — — — — Capital equipment purchase commitments (4) 5,086 5,086 — — — — — Total contractual cash obligations $ 181,083 $ 34,725 $ 21,190 $ 22,173 $ 15,871 $ 16,602 $ 70,522 (1) The Company leases its facilities under long-term operating leases, which expire at various dates through 2027. (2) The Company sponsors events, resorts and athletes as part of its marketing efforts. In many cases, the Company enters into multi-year agreements with event organizers, resorts and athletes. (3) The Company purchases software licenses related to its financial and IT systems which require payments over multiple years. (4) The Company enters into contracts to acquire equipment for tooling and molds as part of its manufacturing operations. In addition, the Company incurs purchase commitments related to the manufacturing of its point-of-purchase (POP) displays by third parties.
Schedule of Product Warranty Liability Activity	The following table summarizes the warranty liability activity: Year ended December 31, (in thousands) 2015 2014 2013 Beginning balances $ 6,405 $ 3,870 $ 1,937 Charged to cost of revenue 25,377 10,268 7,380 Settlements of warranty claims (20,926 ) (7,733 ) (5,447) Ending balances $ 10,856 $ 6,405 $ 3,870

Concentrations of risk and se29

Concentrations of risk and segment information (Tables)	12 Months Ended
	Dec. 31, 2015
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: Year ended December 31, (in thousands) 2015 2014 2013 Accounts receivable sold $ 194,223 $ 250,437 $ 71,066 Factoring fees 1,566 2,148 591
Schedule of Revenue by Geographic Region	Revenue by geographic region, based on ship-to destinations, was as follows: Year ended December 31, (in thousands) 2015 2014 2013 Americas $ 868,772 $ 890,352 $ 557,285 Europe, Middle East and Africa (EMEA) 535,260 371,197 322,226 Asia and Pacific area countries (APAC) 215,939 132,656 106,226 $ 1,619,971 $ 1,394,205 $ 985,737
Accounts Receivable [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	The Company had the following customers who represented 10% or more of its net accounts receivable balance as of the dates indicated: December 31, December 31, Customer A 40% 17% Customer B 18% 11% Customer C * 14% * Less than 10% of total accounts receivable for the period indicated
Sales Revenue [Member]
Concentration Risk [Line Items]
Schedules of Customer Concentration by Risk Factor	Customers with revenue greater than 10% of the Company's total revenue were as follows: Year ended December 31, 2015 2014 2013 Customer D 14% 20% 17% Customer A 12% * * * Less than 10% of total revenue for the period indicated

Summary of significant accoun30

Summary of significant accounting policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 1,400,000	$ 1,250,000
Amortization of Long-term Assets	16,800,000	18,000,000	$ 13,500,000
Impairment of Long-Lived Assets Held-for-use	$ 0
Warranty Period	12 months
Advertising Expense	$ 64,700,000	$ 47,200,000	$ 55,500,000
Minimum [Member]
Property, Plant and Equipment [Line Items]
Long-term Assets, Amortization Period	24 months
Useful life (in years)	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Long-term Assets, Amortization Period	36 months
Useful life (in years)	10 years
European Union [Member]
Property, Plant and Equipment [Line Items]
Warranty Period	2 years
Deferred Income Tax Charge [Member]
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 22,200,000

Consolidated financial statem31

Consolidated financial statement details - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components	$ 9,476	$ 4,324
Finished goods	178,756	148,702
Total inventory	$ 188,232	$ 153,026

Consolidated financial statem32

Consolidated financial statement details - Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
other receivable [Line Items]
Prepaid expenses	$ 6,132	$ 3,905
Prepaid income taxes	4,696	26,504
Prepaid licenses	2,818	2,053
Current deferred tax assets	0	24,218
Other current assets	7,366	7,089
Prepaid expenses and other current assets	25,261	63,769
Building Improvements [Member]
other receivable [Line Items]
Tenant allowance receivable	$ 4,249	$ 0

Consolidated financial statem33

Consolidated financial statement details - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation	$ 24,800	$ 16,800	$ 10,900
Gross property and equipment	120,290	71,356
Less: Accumulated depreciation and amortization	(50,240)	(29,800)
Property and equipment, net	70,050	41,556
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 40,841	22,787
Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	4 years
Gross property and equipment	$ 25,174	8,755
Tooling [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 19,537	16,159
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Gross property and equipment	$ 14,581	9,731
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Gross property and equipment	$ 11,389	6,150
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	4,632	3,944
Tradeshow Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 4,136	$ 3,830
Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	1 year
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Minimum [Member] | Tooling [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	1 year
Minimum [Member] | Tradeshow Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Maximum [Member] | Tooling [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Maximum [Member] | Tradeshow Equipment [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years

Consolidated financial statem34

Consolidated financial statement details - Business Acquisition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 57,095		$ 14,095
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 70,200
Net liabilities assumed		$ (353)
Deferred income tax liabilities		(4,676)
Net assets acquired		27,247
Goodwill		43,000
Total fair value consideration		70,247
Developed Technology Rights [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Purchased technology		25,676
Developed Technology Rights [Member] | Maximum [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Estimated useful life (in years)	6 years
Developed Technology Rights [Member] | Minimum [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Estimated useful life (in years)	4 years
In Process Research and Development [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
In-process research and development (IPR&D)		$ 6,600

Consolidated financial statem35

Consolidated financial statement details - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill	$ 57,095	$ 14,095
Finite-Lived Intangible Assets, Net [Abstract]
Net carrying value	24,412
Intangible assets, net	31,027	2,937
Amortization of intangible assets	4,200	1,100	$ 1,100
Series of Individually Immaterial Business Acquisitions [Member]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill				$ 43,000
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	32,952	7,275
Accumulated amortization	(8,540)	(4,353)
Net carrying value	24,412	2,922
Indefinite lived intangible assets	6,615	15
Intangible Assets, Gross (Excluding Goodwill)	39,567	7,290
Intangible assets, net	$ 31,027	$ 2,937

Consolidated financial statem36

Consolidated financial statement details - Future Amortization (Details) $ in Thousands	Dec. 31, 2015USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
2,016	$ 5,956
2,017	5,172
2,018	4,780
2,019	4,269
2,020	3,365
Thereafter	870
Net carrying value	$ 24,412

Consolidated financial statem37

Consolidated financial statement details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Supply Commitment [Line Items]
Accrued Payables	$ 64,831	$ 56,617
Accrued Sales Incentives	29,298	9,635
Employee-related Liabilities, Current	26,491	28,959
Customer Deposits, Current	8,877	4,903
Warranty liability	10,400	6,025
Accrued Income Taxes, Current	7,536	2,732
Other Liabilities, Current	6,536	9,189
Total accrued liabilities	192,446	118,507
Inventory Valuation and Obsolescence [Member]
Supply Commitment [Line Items]
Loss Contingency, Accrual, Current	$ 38,477	$ 447

Consolidated financial statem38

Consolidated financial statement details - Other Long-term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Long-term Assets [Abstract]
Point of Purchase (POP) Displays	$ 27,989	$ 18,743
Deferred Tax Assets, Gross, Noncurrent	41,936	8,611
Long-Term License Agreement Asset	33,206	0
Deposits Assets, Noncurrent	8,430	8,706
Other long-term assets	$ 111,561	$ 36,060

Consolidated financial statem39

Consolidated financial statement details - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Abstract]
Goodwill	$ 57,095	$ 14,095

Fair value measurements (Detail

Fair value measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities with contractual maturity of one year or less	$ 122,199	$ 58,764
Marketable securities with contractual maturity of one to two years	72,187	43,563
Marketable securities	194,386	102,327
Cash and cash equivalents	228,600	237,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	51,059	82,968
Marketable securities	194,386	102,327
Fair Value, Measurements, Recurring [Member] | Municipal Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	11,913	0
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	1,994
Fair Value, Measurements, Recurring [Member] | US Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	14,451	7,020
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,197	2,497
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	165,825	90,816
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	51,059	80,968
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	2,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	51,059	80,968
Marketable securities	0	1,994
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	1,994
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	51,059	80,968
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	2,000
Marketable securities	194,386	100,333
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	11,913	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Agency Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	14,451	7,020
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2,197	2,497
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	165,825	90,816
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 0	$ 2,000

Stockholders' equity (deficit41

Stockholders' equity (deficit) and redeemable convertible preferred stock - Initial public offering and Follow-on offering (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 01, 2014	Nov. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Preferred Stock, Shares Issued			0	0
IPO [Member] | Common Class A [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	8,900,000
Share Price	$ 24
Stock Sold by Stockholders During Period, Shares, Underwritten Public Offering	11,570,000
Stock Sold by Stockholders During Period, Shares, Over-allotment Option in Underwritten Public Offering	2,670,000
Proceeds from Issuance Initial Public Offering	$ 200.8	$ 93.2
Underwriting Discounts And Commissions	12.8
Total Offering Costs	$ 6.2
Follow-on Offering [Member] | Common Class A [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues		1,287,533
Share Price		$ 75
Stock Sold by Stockholders During Period, Shares, Underwritten Public Offering		10,627,042
Stock Sold by Stockholders During Period, Shares, Over-allotment Option in Underwritten Public Offering		1,554,075
Underwriting Discounts And Commissions		$ 3.4
Total Offering Costs		$ 1.5

Stockholders' equity (deficit42

Stockholders' equity (deficit) and redeemable convertible preferred stock (Details)	1 Months Ended			3 Months Ended	12 Months Ended
	May. 31, 2015shares	Apr. 30, 2015shares	Jun. 30, 2014vote	Jun. 30, 2015shares	Dec. 31, 2015shares	Dec. 31, 2014shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Authorized					5,000,000	5,000,000
Preferred Stock, Shares Issued					0	0
Common Stock, Shares Authorized					500,000,000
Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio			1
Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Temporary Equity, Shares Issued					30,523,036
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized					500,000,000	500,000,000
Common Stock, Shares, Issued					100,596,000	52,091,000
Common Stock, Voting Rights, Number | vote			1
Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Conversion Basis					1-for-1
Common Stock, Shares Authorized					150,000,000	150,000,000
Common Stock, Shares, Issued					36,005,000	77,023,000
Common Stock, Voting Rights, Number | vote			10
Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Conversion Basis			1
Chief Executive Officer (CEO) [Member] | Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Contributed to Company Without Consideration	4,678,180	540,000		5,218,180

Stockholders' equity (deficit43

Stockholders' equity (deficit) and redeemable convertible preferred stock - Common Stock Reserved for Issuance (Details) - shares shares in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	13,081	25,134
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	37,803
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	4,638	4,307	270
Stock Options, Restricted stock, and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	0	17
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	20,084

Stockholders' equity (deficit44

Stockholders' equity (deficit) and redeemable convertible preferred stock - Treasury stock (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Sep. 30, 2015
Class of Stock Disclosures [Abstract]
Stock Repurchase Program, Authorized Amount			$ 300,000,000
Treasury Stock, Shares, Acquired	1.5
Treasury Stock Acquired, Average Cost Per Share	$ 23.05
Repurchases of outstanding Class A common stock	$ 35,600,000	$ 35,613,000

Stockholders' equity (deficit45

Stockholders' equity (deficit) and redeemable convertible preferred stock Common stock (Details) - shares	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common Stock, Shares Authorized	500,000,000
Common Class A [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	100,596,000	52,091,000
Common Class B [Member]
Class of Stock [Line Items]
Common Stock, Shares Authorized	150,000,000	150,000,000
Common Stock, Shares, Issued	36,005,000	77,023,000

Employee benefit plans - Narrat

Employee benefit plans - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2014shares	Dec. 31, 2015USD ($)plan$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding		$ 83,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 108,846	$ 1,425,339
Number of stock-based employee compensation plans | plan		3
Defined Contribution Plan Minimum Annual Contributions Per Employee Percent		1.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		86.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay		4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 18.40	$ 11.51	$ 8.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 633,600	$ 253,300	$ 4,600
Allocated Share-based Compensation Expense		$ 80,583	71,399	10,887
Employee Stock Ownership Plan (ESOP), Shares in ESOP | shares		5,000,000
Shares held in Employee Stock Option Plan, Suspense Shares | shares		4,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value		$ 26,900	16,000	5,200
Restricted Stock and Early-exercised Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding			1,017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 0	$ 11,200	$ 6,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares			$ 6.30
ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock as percentage of fair value of Company common stock (percent)		85.00%
Unearned stock-based compensation costs		$ 600
Unearned stock-based compensation, expected recognition period		1 month 13 days
Aggregate shares purchased by employees | shares		436,924
Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased | $ / shares		$ 26.88
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs		$ 50,200
Unearned stock-based compensation, expected recognition period		2 years 2 months 12 days
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs		$ 107,800
Unearned stock-based compensation, expected recognition period		2 years 6 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 34,400	$ 28,200
Shares granted | shares		2,170,000	5,573,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares		$ 32.15	$ 21.98	$ 1.52
RSUs [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned stock-based compensation costs		$ 7,000
Shares granted | shares	4,500,000
RSUs [Member] | Vested Immediately [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	1,500,000
RSUs [Member] | Share-based Compensation Award, Tranche Two [Member] | Chief Executive Officer (CEO) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted | shares	3,000,000
Allocated Share-based Compensation Expense		$ 29,400	$ 38,300
2014 Equity Incentive Plans [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period		10 years
Award vesting period		4 years
2014 Equity Incentive Plans [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares		$ 15.76	$ 7.16
Proceeds from Stock Plans		$ 11,700

Employee benefit plans - Stock

Employee benefit plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Shares
Outstanding at beginning of period (shares)	25,134
Granted (shares)	792
Exercised (shares)	(12,375)
Forfeited/Cancelled (shares)	(470)
Outstanding at end of period (shares)	13,081	25,134
Weighted- average exercise price
Outstanding at beginning of period (in dollars per share)	$ 6.62
Granted (in dollars per share)	39.66
Exercised (in dollars per share)	2.01
Forfeited/Cancelled (in dollars per share)	38.84
Outstanding at end of period (in dollars per share)	$ 11.82	$ 6.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 12 days	7 years 1 month 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 108,846	$ 1,425,339
Exercisable (shares)	8,449
Exercisable - Weighted average exercise price (in dollars per share)	$ 6.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 10 months 21 days
Exercisable - Aggregate intrinsic value	$ 103,696
Vested and expected to vest (shares)	12,858
Vested and expected to vest - Weighted average exercise price (in dollars per share)	$ 11.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	6 years 8 months 1 day
Vested and expected to vest - Aggregate intrinsic value	$ 108,681

Employee benefit plans - Restri

Employee benefit plans - Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted- average grant date fair value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 83,500
Restricted Stock and Early-exercised Options [Member]
Shares
Non-vested shares at beginning of period (shares)	17
Vested (shares)	(17)
Non-vested shares at end of period (shares)	0	17
Weighted- average grant date fair value
Non-vested shares at beginning of period (in dollars per share)	$ 6.30
Non-vested shares at end of period (in dollars per share)		$ 6.30
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding		$ 1,017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 0	$ 11,200	$ 6,100
RSUs [Member]
Shares
Non-vested shares at beginning of period (shares)	4,307	270
Granted (shares)	2,170	5,573
Vested (shares)	(1,735)	(1,533)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 19.84	$ 18.42
Forfeited (shares)	(104)	(3)
Non-vested shares at end of period (shares)	4,638	4,307	270
Weighted- average grant date fair value
Non-vested shares at beginning of period (in dollars per share)	$ 21.98	$ 1.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	44	22.01
Forfeited (in dollars per share)	63.47	57.73
Non-vested shares at end of period (in dollars per share)	$ 32.15	$ 21.98	$ 1.52
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 34,400	$ 28,200

Employee benefit plans - Fair V

Employee benefit plans - Fair Value Assumptions for Stock Options (Details) - Employee Stock Option [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	1.60%	1.70%	0.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	2.00%	2.00%	2.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	0.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	43.00%	54.00%	56.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	5 years 6 months	5 years 3 months 18 days	5 years 3 months 18 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	54.00%	56.00%	60.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years	6 years 3 months 18 days	6 years 1 month 6 days

Employee benefit plans - Fair50

Employee benefit plans - Fair Value Assumptions for Restricted Stock Units and ESPP (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Employee Stock Purchase Plan Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		45.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 months	7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		0.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	0.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	0.20%
Employee Stock Purchase Plan Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	39.00%
Employee Stock Purchase Plan Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	45.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		50.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.69%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted-average Fair Value at Purchase Date		$ 18.40

Employee benefit plans - Alloca

Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, before income taxes	$ 80,680	$ 71,399	$ 10,887
Total tax benefit recognized	(27,971)	(19,471)	(1,104)
Total stock-based compensation expense, net of income taxes	52,709	51,928	9,783
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, before income taxes	1,492	835	690
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, before income taxes	18,024	11,640	3,003
Selling and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, before income taxes	13,762	10,428	5,670
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, before income taxes	$ 47,402	$ 48,496	$ 1,524

Employee benefit plans Employee

Employee benefit plans Employee retirement plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan Minimum Annual Contributions Per Employee Percent	1.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	86.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 5,500	$ 2,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 108,846	$ 1,425,339

Net income per share attribut53

Net income per share attributable to common stockholders - Additional Information (Details)	1 Months Ended
	Jun. 30, 2014vote
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stockholders' Equity Note, Outstanding Shares Less than 10% of Aggregate Shares Outstanding, Conversion Ratio	1
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number	1
Common Class B [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, Voting Rights, Number	10

Net income per share attribut54

Net income per share attributable to common stockholders - Basic and Diluted Net Income per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 36,131	$ 128,088	$ 60,578
Less: net income allocable to participating securities	0	(16,512)	(16,727)
Numerator:
Net income attributable to common stockholders—basic	36,131	111,576	43,851
Add: net income allocable to dilutive participating securities	0	2,277	2,309
Reallocation of net income			0
Undistributed Earnings (Loss) Reallocated to Participating Securities, Diluted			0
Net income attributable to common stockholders—diluted	$ 36,131	$ 113,853	$ 46,160
Denominator:
Weighted-average common shares—basic (in shares)	134,595	104,453	81,018
Conversion of Class B to Class A common stock outstanding (in shares)			0
Effect of potentially dilutive stock options, ESPP shares and RSUs (in shares)			17,923
Weighted-average common shares—diluted (in shares)	146,486	123,630	98,941
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ 0.27	$ 1.07	$ 0.54
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ 0.25	$ 0.92	$ 0.47
Common Class A [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 24,559	$ 16,647
Less: net income allocable to participating securities	0	(2,147)
Numerator:
Net income attributable to common stockholders—basic	24,559	14,500
Add: net income allocable to dilutive participating securities	0	2,277
Reallocation of net income	11,572	97,076
Undistributed Earnings (Loss) Reallocated to Participating Securities, Diluted	0	0
Net income attributable to common stockholders—diluted	$ 36,131	$ 113,853
Denominator:
Weighted-average common shares—basic (in shares)	91,486	13,575
Conversion of Class B to Class A common stock outstanding (in shares)	43,109	90,878
Effect of potentially dilutive stock options, ESPP shares and RSUs (in shares)	11,891	19,177
Weighted-average common shares—diluted (in shares)	146,486	123,630
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ 0.27	$ 1.07
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ 0.25	$ 0.92
Common Class B [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 11,572	$ 111,441
Less: net income allocable to participating securities	0	(14,365)
Numerator:
Net income attributable to common stockholders—basic	11,572	97,076
Add: net income allocable to dilutive participating securities	$ 0	1,981
Reallocation of net income		0
Undistributed Earnings (Loss) Reallocated to Participating Securities, Diluted	$ 1,974	2,237
Net income attributable to common stockholders—diluted	$ 13,546	$ 101,294
Denominator:
Weighted-average common shares—basic (in shares)	43,109	90,878
Conversion of Class B to Class A common stock outstanding (in shares)	0	0
Effect of potentially dilutive stock options, ESPP shares and RSUs (in shares)	11,810	19,115
Weighted-average common shares—diluted (in shares)	54,919	109,993
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ 0.27	$ 1.07
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ 0.25	$ 0.92

Net income per share attribut55

Net income per share attributable to common stockholders - Antidilutive Securities Excluded from Computation of Net Income per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted shares outstanding (shares)	2,681	15,921	32,312
Series A Redeemable Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted shares outstanding (shares)	0	15,136	30,523
Stock Options, ESPP and Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted shares outstanding (shares)	2,680	360	1,409
Unvested Stock Awards and Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the calculation of diluted shares outstanding (shares)	1	425	380

Income taxes (Details)

Income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 129,100
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 36,273	$ 16,558	$ 9,898	$ 4,439
Unrecognized tax benefits that would be recorded as reduction in income tax provision, if recognized	31,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200	$ 200	$ 0
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	395,500
Tax Credit Carryforward, Amount	24,200
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	249,200
Tax Credit Carryforward, Amount	18,400
Tax Credit Carryforward, Amount To Be Recorded to Additional Paid In Capital When Realized	3,900
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	(13,700)
New Accounting Pronouncement, Early Adoption, Effect [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax asset reclassified from current to non-current	$ 22,200

Income taxes - Income Before In

Income taxes - Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 13,562	$ 114,937	$ 57,251
Income (Loss) from Continuing Operations before Income Taxes, Foreign	39,023	66,038	34,078
Income before income taxes	$ 52,585	$ 180,975	$ 91,329

Income taxes - Income Tax Expen

Income taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 18,548	$ 55,846	$ 28,856
Current State and Local Tax Expense (Benefit)	3,007	6,075	1,634
Current Foreign Tax Expense (Benefit)	6,539	8,219	8,058
Current Income Tax Expense (Benefit)	28,094	70,140	38,548
Deferred Federal Income Tax Expense (Benefit)	(11,211)	(13,551)	(7,268)
Deferred State and Local Income Tax Expense (Benefit)	(204)	(3,369)	(861)
Deferred Foreign Income Tax Expense (Benefit)	(225)	(333)	332
Deferred income taxes	(11,640)	(17,253)	(7,797)
Income tax expense	16,454	$ 52,887	$ 30,751
Increase (Decrease) in Income Taxes	$ (36,400)

Income taxes - Income Tax Exp59

Income taxes - Income Tax Expense Reconciled to Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances	$ 8,812	$ 9,466
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	18,405	63,341	$ 31,965
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,454	4,911	2,344
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	6,434	(13,305)	(113)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	2,390	8,050	2,982
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(21,891)	(10,616)	(5,637)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	1,107	506	(790)
Income tax expense	$ 16,454	$ 52,887	$ 30,751
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	2.80%	2.70%	2.60%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	12.20%	(7.40%)	(0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	4.50%	4.40%	3.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(41.60%)	(5.90%)	(6.20%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 8,555	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	16.30%	(0.00%)	(0.00%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	2.10%	0.40%	(0.90%)
Effective Income Tax Rate Reconciliation, Percent	31.30%	29.20%	33.70%

Income taxes - Significant Comp

Income taxes - Significant Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 339	$ 0
Deferred Tax Assets, Tax Credit Carryforwards	9,372	2,347
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	19,096	9,950
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Returns and Allowances	8,812	9,466
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	20,398	14,484
Deferred Tax Assets, Gross	58,017	36,247
Deferred Tax Assets, Valuation Allowance	(8,555)	0
Deferred Tax Assets, Net of Valuation Allowance	49,462	36,247
Deferred Tax Liabilities, Property, Plant and Equipment	(6,937)	(3,418)
Deferred Tax Liabilities, Goodwill and Intangible Assets	(2,904)	0
Deferred Tax Liabilities, Gross	(9,841)	(3,418)
Deferred Tax Assets, Net	$ 39,621	$ 32,829

Income taxes - Reconciliation o

Income taxes - Reconciliation of Unrecognized Income Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued		$ 200	$ 200	$ 0
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 19,700
Unrecognized Tax Benefits	$ 16,558	16,558	9,898	4,439
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions		19,948	6,401	5,280
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		108	259	179
Unrecognized Tax Benefits		36,273	16,558	9,898
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ (341)	$ 0	$ 0

Related parties (Details)

Related parties (Details)	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2014USD ($)Automobile	May. 31, 2014$ / sharesshares	Jun. 30, 2013USD ($)	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)Device	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Company Affiliated with Investors [Member]
Related Party Transaction [Line Items]
Accounts Payable, Related Parties					$ 0	$ 100,000
Company Affiliated with Investors [Member] | Related Party Transaction, Contract Manufacturing Agreement [Member]
Related Party Transaction [Line Items]
Payments made to affiliated vendor for services rendered					200,000	12,200,000	$ 3,600,000
Chief Executive Officer (CEO) [Member] | Related Party Transaction, Chartered Aircraft Expenses [Member]
Related Party Transaction [Line Items]
Due to Related Parties					100,000	400,000
Payments to related parties					1,000,000	$ 500,000
Chief Executive Officer (CEO) [Member] | Related Party Transaction, Automobiles Purchased [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Number of Automobiles Purchased by Related Party | Automobile	7
Revenue from Related Parties	$ 300,000
Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Stock Repurchased During Period, Shares | shares		41,154
Related Party Transaction, Shares Repurchased During Period, Purchase Price | $ / shares		$ 18.40
Immediate Family Member of Member of the Board [Member]
Related Party Transaction [Line Items]
Naming rights agreement, period							3 years
Payments to be made to related party for naming rights				$ 500,000
Aggregate payments to related party for naming rights					$ 500,000
Number of devices provided to related party at no cost | Device					100
Immediate Family Member of Management or Principal Owner [Member] | Related Party Transaction, Settlement of Legal Matter [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Legal Settlement, Amount			$ 200,000
Executive Officer [Member] | Related Party Transaction, Demand Payment Loan [Member]
Related Party Transaction [Line Items]
Loan amount to executive officer pursuant to demand payment loan			$ 200,000

Commitments, contingencies an63

Commitments, contingencies and guarantees - Schedule of Company's Contractual Commitments (Details) $ in Thousands	Dec. 31, 2015USD ($)
Long-term Purchase Commitment [Line Items]
Operating leases	$ 152,237
Operating Leases, Future Minimum Payments Due, Next Twelve Months	16,597
Operating Leases, Future Minimum Payments, Due in Two Years	15,783
Operating Leases, Future Minimum Payments, Due in Three Years	19,582
Operating Leases, Future Minimum Payments, Due in Four Years	13,151
Operating Leases, Future Minimum Payments, Due in Five Years	16,602
Operating leases: More than 5 years (beyond 2020)	70,522
Other contractual commitments	4,574
Other Commitment, Due in Next Twelve Months	3,153
Other Commitment, Due in Second Year	1,421
Other Commitment, Due in Third Year	0
Other Commitment, Due in Fourth Year	0
Other Commitment, Due in Fifth Year	0
Other contractual commitments: More than 5 years (beyond 2020)	0
Capital equipment purchase commitments	5,086
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	5,086
Unrecorded Unconditional Purchase Obligation, Due within Two Years	0
Unrecorded Unconditional Purchase Obligation, Due within Three Years	0
Unrecorded Unconditional Purchase Obligation, Due within Four Years	0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0
Unrecorded Unconditional Purchase Obligation, Due after Five Years	0
Total contractual cash obligations	181,083
Contractual Obligation, Due in Next Twelve Months	34,725
Contractual Obligation, Due in Second Year	21,190
Contractual Obligation, Due in Third Year	22,173
Contractual Obligation, Due in Fourth Year	15,871
Contractual Obligation, Due in Fifth Year	16,602
Contractual Obligation, Due after Fifth Year	70,522
Sponsorship commitment [Member]
Long-term Purchase Commitment [Line Items]
Other contractual commitments	19,186
Other Commitment, Due in Next Twelve Months	9,889
Other Commitment, Due in Second Year	3,986
Other Commitment, Due in Third Year	2,591
Other Commitment, Due in Fourth Year	2,720
Other Commitment, Due in Fifth Year	0
Other contractual commitments: More than 5 years (beyond 2020)	$ 0

Commitments, contingencies an64

Commitments, contingencies and guarantees - Schedule of Product Warranty Liability Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balances	$ 6,405	$ 3,870	$ 1,937
Charged to cost of revenue	25,377	10,268	7,380
Settlements of warranty claims	(20,926)	(7,733)	(5,447)
Ending balances	$ 10,856	$ 6,405	$ 3,870

Commitments, contingencies an65

Commitments, contingencies and guarantees - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Operating leases: More than 5 years (beyond 2020)	$ 70,522
Rent expense	12,200	$ 7,300	$ 3,900
Current product warranty accrual	10,400	6,025
Noncurrent product warranty accrual	500	$ 400
Inventory Valuation and Obsolescence [Member]
Loss Contingencies [Line Items]
Loss Contingency, Accrual, Current	$ 35,900

Concentrations of risk and se66

Concentrations of risk and segment information - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Financing Receivable, Significant Sales	$ 194,223	$ 250,437	$ 71,066
Factoring fees	1,566	2,148	(591)
Revenue	1,619,971	1,394,205	985,737
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	769,200	796,000	498,500
Formerly APAC to EMEA Region [Member]
Revenue, Major Customer [Line Items]
Revenue		19,300	10,600
Outside the United States [Member]
Revenue, Major Customer [Line Items]
Long-lived assets	$ 47,600	$ 25,400	$ 6,000

Concentrations of risk and se67

Concentrations of risk and segment information - Schedule of Customer Concentration by Risk Factor (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable [Member] | Customer A (Retailer) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	40.00%	17.00%
Accounts Receivable [Member] | Customer B (Distributor) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	18.00%	11.00%
Accounts Receivable [Member] | Customer C (Retailer) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		14.00%
Sales Revenue [Member] | Customer A (Retailer) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	12.00%
Sales Revenue [Member] | Customer D (Retailer) [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	14.00%	20.00%	17.00%

Concentrations of risk and se68

Concentrations of risk and segment information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Revenue	$ 1,619,971	$ 1,394,205	$ 985,737
Americas [Member]
Revenue, Major Customer [Line Items]
Revenue	868,772	890,352	557,285
Europe, Middle East and Africa [Member]
Revenue, Major Customer [Line Items]
Revenue	535,260	371,197	322,226
Asia and Pacific Area Countries [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 215,939	$ 132,656	$ 106,226
Sales Revenue [Member] | Customer Concentration Risk [Member] | Customer A (Retailer) [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	12.00%

Concentrations of risk and se69

Concentrations of risk and segment information - Schedule of Factored Accounts Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Factored Accounts Receivable [Abstract]
Financing Receivable, Significant Sales	$ 194,223	$ 250,437	$ 71,066
Factoring fees	$ 1,566	$ 2,148	$ (591)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Feb. 25, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross		$ 65,405	$ 3,950	$ 2,912
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 105,000

Schedule II (Details)

Schedule II (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts Receivable, Current	$ 1,250
Deferred Tax Assets, Valuation Allowance	0
Allowance for Doubtful Accounts Receivable, Current	1,400	$ 1,250
Deferred Tax Assets, Valuation Allowance	8,555	0
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Doubtful Accounts Receivable, Current	1,250	520	$ 262
Revenue Recognition, Sales Returns, Reserve for Sales Returns	0	0	0
Provision for Doubtful Accounts	682	970	663
Allowance for Doubtful Accounts Receivable, Current	1,400	1,250	520
Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	25,747	14,352	9,077
Revenue Recognition, Sales Returns, Reserve for Sales Returns	48,182	39,011	24,156
Provision for Doubtful Accounts	(47,649)	(27,616)	(18,881)
Valuation Allowances and Reserves, Balance	26,280	25,747	$ 14,352
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred Tax Assets, Valuation Allowance	0
Revenue Recognition, Sales Returns, Reserve for Sales Returns	0
Valuation Allowances and Reserves, Charged to Cost and Expense	8,555
Deferred Tax Assets, Valuation Allowance	$ 8,555	$ 0