Roku (ROKU) 10-K 2 Mar 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	ROKU
Entity Registrant Name	ROKU, INC
Entity Central Index Key	0001428439
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity File Number	001-38211
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-2087865
Entity Address, Address Line One	150 Winchester Circle
Entity Address, City or Town	Los Gatos
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	95032
City Area Code	408
Local Phone Number	556-9040
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Security Exchange Name	NASDAQ
Entity Public Float			$ 7,714,110,102
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Part III incorporates by reference certain information from the Registrant’s definitive proxy statement (the “2019 Proxy Statement”) for the 2020 Annual Meeting of Stockholders. The 2019 Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2019.
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		94,759,950
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		25,218,517

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 515,479,000	$ 155,564,000
Short-term investments	0	42,146,000
Restricted cash	1,854,000
Accounts receivable, net of allowances of $27,521 and $21,897 as of	332,673,000	183,078,000
Inventories	49,714,000	35,585,000
Prepaid expenses and other current assets	25,943,000	16,562,000
Total current assets	925,663,000	432,935,000
Property and equipment, net	103,262,000	25,264,000
Operating lease right-of-use assets	283,291,000
Intangible assets, net	76,668,000	1,477,000
Goodwill	74,116,000	1,382,000
Other non-current assets	7,234,000	3,939,000
Total Assets	1,470,234,000	464,997,000
Current Liabilities:
Accounts payable	115,227,000	56,576,000
Accrued liabilities	198,347,000	91,986,000
Current portion of long-term debt	4,866,000
Deferred revenue, current portion	39,861,000	45,442,000
Total current liabilities	358,301,000	194,004,000
Long-term debt, non-current portion	94,742,000
Deferred revenue, non-current portion	15,370,000	19,594,000
Operating lease liability, non-current	301,694,000
Other long-term liabilities	1,701,000	6,748,000
Total Liabilities	771,808,000	220,346,000
Commitments and contingencies (Note 12)
Stockholders’ Equity:
Preferred stock, $0.0001 par value; 10,000 shares authorized as of December 31,2019 and 2018, no shares issued and outstanding as of December 31,2019 and 2018, respectively	0	0
Common stock, $0.0001 par value; 1,150,000 (Class A - 1,000,000 and Class B - 150,000) shares authorized as of December 31, 2019 and 2018; 119,897 (Class A - 93,574 and Class B - 26,323) shares and 109,770 (Class A - 77,820 and Class B - 31,950) shares issued and outstanding as of December 31, 2019 and 2018, respectively	12,000	11,000
Additional paid-in capital	1,012,218,000	498,553,000
Accumulated other comprehensive loss	29,000	(17,000)
Accumulated deficit	(313,833,000)	(253,896,000)
Total stockholders’ equity	698,426,000	244,651,000
Total Liabilities and Stockholders’ Equity	$ 1,470,234,000	$ 464,997,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts receivable, allowances	$ 27,521	$ 21,897
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,150,000,000	1,150,000,000
Common stock, shares issued	119,897,000	109,770,000
Common stock, shares outstanding	119,897,000	109,770,000
Class A Common Stock
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	93,574,000	77,820,000
Common stock, shares outstanding	93,574,000	77,820,000
Class B Common Stock
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	26,323,000	31,950,000
Common stock, shares outstanding	26,323,000	31,950,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Revenue:
Total net revenue	$ 1,128,921	$ 742,506	$ 512,763
Cost of Revenue:
Total cost of revenue	633,697	410,358	312,930
Gross Profit:
Total gross profit	495,224	332,148	199,833
Operating Expenses:
Research and development	265,011	170,692	107,945
Sales and marketing	178,855	102,780	64,069
General and administrative	116,417	71,972	47,435
Total operating expenses	560,283	345,444	219,449
Loss from Operations	(65,059)	(13,296)	(19,616)
Other Income (Expense), Net:
Interest expense	(2,366)	(346)	(1,612)
Loss on extinguishment of debt			(2,338)
Change in fair value of preferred stock warrant liability			(40,333)
Other income (expense), net	6,506	4,309	705
Total other income (expense), net	4,140	3,963	(43,578)
Loss Before Income Taxes	(60,919)	(9,333)	(63,194)
Income tax (benefit) expense	(982)	(476)	315
Net Loss Attributable to Common Stockholders	$ (59,937)	$ (8,857)	$ (63,509)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.52)	$ (0.08)	$ (2.24)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	115,218	104,618	28,308
Platform | Services
Net Revenue:
Total net revenue	$ 740,776	$ 416,863	$ 225,356
Cost of Revenue:
Total cost of revenue	262,655	120,543	54,826
Gross Profit:
Total gross profit	478,121	296,320	170,530
Player | Goods
Net Revenue:
Total net revenue	388,145	325,643	287,407
Cost of Revenue:
Total cost of revenue	371,042	289,815	258,104
Gross Profit:
Total gross profit	$ 17,103	$ 35,828	$ 29,303

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net Loss Attributable to Common Stockholders	$ (59,937,000)	$ (8,857,000)	$ (63,509,000)
Other comprehensive gain (loss), net of tax:
Unrealized gain (loss) on short-term investments, net of tax	17,000	(17,000)	0
Foreign currency translation adjustment	29,000
Other comprehensive gain (loss), net of tax	46,000	(17,000)
Comprehensive Net Loss	$ (59,891,000)	$ (8,874,000)	$ (63,509,000)

Consolidated Statements of Conv

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) shares in Thousands	Total	Initial Public Offering	At-the-Market Offerings	Convertible Preferred Stock	Common Stock	Common StockInitial Public Offering	Common StockAt-the-Market Offerings	Additional Paid-in Capital	Additional Paid-in CapitalInitial Public Offering	Additional Paid-in CapitalAt-the-Market Offerings	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance at Dec. 31, 2016	$ (193,824,000)							$ 26,005,000					$ (219,829,000)
Balance, Shares at Dec. 31, 2016				80,844
Balance at Dec. 31, 2016				$ 213,180,000
Balance, Shares at Dec. 31, 2016					4,819
Issuance of common stock upon exercise of stock options	2,087,000				$ 1,000			2,086,000
Issuance of common stock upon exercise of stock options, Shares					963
Share repurchases	(671,000)										$ (671,000)
Share repurchases, Shares					(92)
Vesting of early exercised stock options	62,000							62,000
Stock-based compensation expense	10,953,000							10,953,000
Issuance of common stock pursuant to an acquisition, Shares					108
Issuance of common stock shares upon exercise of common and preferred warrants, Shares					2,165
Issuance of common stock, net of issuance costs		$ 131,646,000				$ 1,000			$ 131,645,000
Issuance of common stock, net of issuance costs, Shares						10,350
Conversion of preferred stock into common stock pursuant to an initial public offering	213,180,000			$ (213,180,000)	$ 8,000			213,172,000
Conversion of preferred stock into common stock pursuant to an initial public offering, Shares				(80,844)	80,844
Reclassification of preferred stock warrants liability to additional paid-in-capital upon conversion to common stock warrants	52,355,000							52,355,000
Unrealized gain (loss) on short-term investments	0
Net loss	(63,509,000)												(63,509,000)
Balance at Dec. 31, 2017	152,279,000				$ 10,000			436,278,000			(671,000)		(283,338,000)
Balance, Shares at Dec. 31, 2017					99,157
Share repurchases, Shares					(9)
Vesting of early exercised stock options	239,000							239,000
Issuance of common stock pursuant to equity incentive plans, net of taxes	25,034,000				$ 1,000			25,033,000
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares					10,481
Issuance of common stock pursuant to exercise of common stock warrants, net, Shares					141
Stock-based compensation expense	37,674,000							37,674,000
Cumulative effect change in accounting principle | Accounting Standards Update 2016-16	(40,000)												(40,000)
Cumulative effect change in accounting principle | Accounting Standards Update 2014-09	38,339,000												38,339,000
Unrealized gain (loss) on short-term investments	(17,000)											$ (17,000)
Net loss	(8,857,000)												(8,857,000)
Balance at Dec. 31, 2018	244,651,000				$ 11,000			499,224,000			(671,000)	(17,000)	(253,896,000)
Balance, Shares at Dec. 31, 2018					109,770
Share repurchases, Shares					(2)
Vesting of early exercised stock options	86,000							86,000
Issuance of common stock pursuant to equity incentive plans, net of taxes	28,182,000				$ 1,000			28,181,000
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares					6,169
Stock-based compensation expense	85,175,000							85,175,000
Issuance of common stock pursuant to an acquisition	69,684,000							69,684,000
Issuance of common stock pursuant to an acquisition, Shares					571
Issuance of common stock, net of issuance costs			$ 330,539,000							$ 330,539,000
Issuance of common stock, net of issuance costs, Shares							3,389
Unrealized gain (loss) on short-term investments	17,000											17,000
Foreign currency translation adjustment	29,000											29,000
Net loss	(59,937,000)												(59,937,000)
Balance at Dec. 31, 2019	$ 698,426,000				$ 12,000			$ 1,012,889,000			$ (671,000)	$ 29,000	$ (313,833,000)
Balance, Shares at Dec. 31, 2019					119,897

Consolidated Statements of Co_2

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
At-the-Market Offerings
Issuance of common stock, issuance cost	$ 6.4
Initial Public Offering
Issuance of common stock, issuance cost		$ 3.1

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net loss	$ (59,937)	$ (8,857)	$ (63,509)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,669	8,389	5,336
Stock-based compensation expense	85,175	37,674	10,953
Provision for doubtful accounts	704	876	104
Change in fair value of preferred stock warrant liability			40,333
Noncash interest expense	531	342	784
(Gain) Loss from exit of facilities and disposal of property and equipment	(2)	1,128	579
Loss from extinguishment of debt			2,338
Impairment of long-lived assets	854	352
Amortization of premiums on short-term investments	(282)	(357)
Changes in operating assets and liabilities:
Accounts receivable	(110,225)	(50,673)	(41,184)
Inventories	(14,129)	(2,953)	10,828
Prepaid expenses and other current assets	(11,566)	(306)	(6,514)
Operating lease right-of-use assets	22,328
Deferred cost of revenue	1,143	2,261	(1,959)
Other noncurrent assets	(3,060)	(732)	(2,794)
Accounts payable	9,409	(98)	24,315
Accrued liabilities	79,058	17,914	24,127
Operating lease liabilities	11,658
Other long-term liabilities	(3,024)	(1,101)	3,579
Deferred revenue	(10,597)	10,063	29,976
Net cash provided by operating activities	13,707	13,922	37,292
Cash flows from investing activities:
Purchase of property and equipment	(77,180)	(18,327)	(9,229)
Purchase of business, net of cash acquired	(68,132)		(2,959)
Purchase of intangible assets	(7,428)
Purchases of short-term investments	(12,365)	(53,806)
Sales/maturities of short-term investments	54,810	12,000
Change in deposits			(80)
Net cash used in investing activities	(110,295)	(60,133)	(12,268)
Cash flows from financing activities:
Proceeds from borrowings, net of issuance costs	99,608		24,691
Repayments of borrowings			(40,446)
Holdback payment for a prior business acquisition		(500)
Proceeds from equity issued under incentive plans, net of repurchases	28,181	25,025	1,773
Net cash provided by financing activities	458,328	24,525	117,664
Net Increase (Decrease) in cash, cash equivalents and restricted cash	361,740	(21,686)	142,688
Effect of exchange rate changes on cash, cash equivalents and restricted cash	29
Cash, cash equivalents and restricted cash —Beginning of period	155,564	177,250	34,562
Cash, cash equivalents and restricted cash —End of period	517,333	155,564	177,250
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	515,479	155,564	177,250
Restricted cash	1,854
Cash, cash equivalents and restricted cash —End of period	517,333	155,564	177,250
Supplemental disclosures of cash flow information:
Cash paid for interest	3,095	493	1,149
Cash paid for income taxes	759	564	222
Supplemental disclosures of noncash investing and financing activities:
Issuance of common stock for business combinations	69,684
Unpaid portion of property and equipment purchases	10,762	$ 1,617	1,250
Unpaid portion of acquisition related expenses	2,190
Unpaid portion of purchased intangibles	400
Unpaid portion of at-the-market offering costs	144
Fair value of preferred stock warrants reclassified to additional paid in capital			52,355
Issuance of convertible preferred stock warrants in connection with debt			2,032
At-the-Market Offerings
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	$ 330,539
Initial Public Offering
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs			$ 131,646

The Company

The Company	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company	1. THE COMPANY Organization and Description of Business Roku, Inc. (the “Company” or “Roku”), was formed in October 2002 as Roku LLC under the laws of the State of Delaware. On February 1, 2008, Roku LLC was converted into Roku, Inc., a Delaware corporation. The Company’s TV streaming platform allows users to easily discover and access a wide variety of movies and TV episodes, as well as live sports, music, news and more. The Company operates in two reportable segments and generates platform revenue from advertising, content distribution, audience development, billing services and licensing activities and player revenue from the sale of streaming players and audio products. Initial Public Offering On October 2, 2017, the Company completed its initial public offering (“IPO”), of Class A common stock, in which it sold 10.4 million shares, including 1.4 million shares pursuant to the underwriters’ over-allotment option. The shares were sold at an IPO price of $14.00 per share for net proceeds of $134.8 million, after deducting underwriting discounts and commissions of $10.1 million. Additionally, offering costs incurred by the Company were $3.1 million. Upon the closing of the Company’s IPO, all outstanding shares of its convertible preferred stock automatically converted into 80.8 million shares of Class B common stock and all outstanding convertible preferred stock warrants automatically converted to Class B common stock warrants on a one

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Principles of Consolidation The consolidated financial statements, which include the accounts of Roku, Inc. and its wholly-owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated in consolidation. Use of Estimates The preparation of the Company’s consolidated financial statements in accordance with U.S. GAAP requires management to make certain estimates, judgements, and assumptions that affect the reported amounts of assets, liabilities, net revenue and expenses. Significant items subject to such estimates and assumptions include: for revenue recognition, determining the nature and timing of satisfaction of performance obligations, variable consideration, determining the stand-alone selling prices of performance obligations, gross versus net revenue recognition, evaluation of customer versus vendor relationships, and other obligations such as sales return reserves and customer incentive programs; the fair value or impairment of goodwill and intangible assets; useful lives of tangible and intangible assets; allowances for doubtful accounts; the valuation of inventory, the valuation of deferred income tax assets; the recognition and disclosure of contingent liabilities and stock-based compensation. The Company bases its estimates on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results may differ from the Company’s estimates and assumptions. Comprehensive Loss Comprehensive loss includes unrealized gains on the Company’s short-term investments and foreign currency translation adjustments for the year ended December 31, 2019. Comprehensive loss includes unrealized losses on the Company’s short-term investments for the year ended December 31, 2018. During the year ended December 31, 2017, the Company had no short-term investments, and, as a result, comprehensive loss was equal to the net loss for the year ended December 31, 2017. Foreign Currency The functional currency of most of the Company’s foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities of these subsidiaries are remeasured into U.S. dollars from the local currency at rates in effect at period-end and nonmonetary assets and liabilities are remeasured at historical rates. Revenues and expenses are remeasured at average exchange rates in effect during each period. Foreign currency gains or losses from re-measurement and transaction gains or losses are recorded as other income (expense), net in the consolidated statements of operations. During the years ended December 31, 2019 and 2018, the Company recorded a foreign currency loss of $0.2 million and $0.5 million, respectively. During the year ended December 31, 2017, the Company recorded a foreign currency gain of $0.1 million. The functional currency for one of the Company’s foreign subsidiaries is its local currency. The Company translates the assets and liabilities of its non-U.S. dollar functional currency subsidiary into U.S. dollars using exchange rates in effect at the end of each reporting period. Revenues and expenses are translated using rates that approximate those in effect during the period. Gains and losses from these translations are recognized as cumulative translation adjustment and included in accumulated other comprehensive loss in stockholder’s equity. Concentrations Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of cash, cash equivalents, short-term investments and accounts receivable. As of December 31, 2019, two Accounts receivable are typically unsecured and are derived from revenue earned from customers. They are stated at invoice value less estimated allowances for returns, customer incentives and doubtful accounts. The Company performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. Customers accounting for 10% or more of the Company’s net revenue were as follows: Years Ended December 31, 2019 2018 2017 Customer B * * 10 % Customer C 14 % 18 % 20 % Customer E * * 10 % Customers accounting for 10% or more of the Company’s accounts receivable were as follows: As of December 31, 2019 2018 Customer D * 11 % Business Combinations The Company determines whether a transaction meets the definition of a business combination before applying the acquisition method of accounting to that transaction. The Company allocates the fair value of the purchase consideration of its acquisitions to the tangible and intangible assets acquired and liabilities assumed, based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of identifiable assets and liabilities is recorded as goodwill. The operating results of acquired business is included in the Company’s consolidated statement of operations beginning on their effective acquisition date. Acquisition-related expenses and certain acquisition restructuring and other related charges are recognized separately from the business combination and are expensed as incurred. Contingent consideration arrangements are recognized at fair value as of the acquisition date with subsequent fair value adjustments recorded in operations. Additional information regarding the Company's contingent consideration arrangement is included in Note 4, Business Combinations. While the Company uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially recorded in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of operations. Intangible Assets Purchased intangible assets are carried at cost, net of accumulated amortization. Intangible assets are amortized primarily using the straight-line method over their estimated useful lives. The Company evaluates the estimated remaining useful lives of its intangible assets annually and when events or changes in circumstances warrant a revision to the remaining periods of amortization. Impairment Assessment The Company evaluates goodwill for possible impairment at least annually during the fourth quarter of each fiscal year or more often, if and when circumstances indicate that goodwill may be impaired. This includes but is not limited to significant adverse changes in the business climate, market conditions, or other events that indicate that it is more likely than not that the fair value of a reporting unit is less than its carrying value. In performing its annual goodwill assessment, the Company first performs a qualitative test and if necessary, then performs a quantitative test. To conduct the quantitative impairment test of goodwill, the Company compares the fair value of a reporting unit to its carrying value. The Company estimates the fair values of its reporting unit using discounted cash flow models or other valuation models, such as comparative transactions and market multiples. If the reporting unit’s carrying value exceeds its fair value, the Company records an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value. The Company reviews long-lived assets and intangible assets with finite lives for impairment at least annually or more often when events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of those assets are no longer appropriate. If impairment is indicated, the Company writes down the asset to its estimated fair value. The Company did not recognize any impairment for goodwill and intangible assets in any periods. The Company recorded $0.9 million in impairment to operating right-of-use assets during the year ended December 31, 2019 and $0.4 million in impairment to property and equipment during the year ended December 31, 2018 for assets that are no longer in use. The Company did not record any impairment during the year ended December 31, 2017. Fair Value of Financial Instruments The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company applies fair value accounting for all assets and liabilities that are recognized or disclosed at fair value in the consolidated financial statements. The carrying amounts reported in the consolidated financial statements for cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to their short-term nature. The carrying amount of debt approximates fair value due to its variable interest rates. Short-Term Investments The Company considers investments in highly liquid instruments purchased with an original maturity of 90 days or less to be cash equivalents. The Company’s short-term investments consist of corporate bonds, commercial paper and U.S. Government agency securities. These investments are held in the custody of one major financial institution. As of December 31, 2019, the Company did not own any short-term investments. As of December 31, 2018, the short-term investments were classified as available-for-sale and were recorded at fair value in the consolidated balance sheet with net unrealized gains or losses reported as a separate component of accumulated other comprehensive income (loss), net of tax. The Company recognizes an impairment charge if a decline in the fair value of its investments is considered to be other-than-temporary. The Company has determined that gross unrealized losses on short-term investments at December 31, 2018 were temporary in nature because each investment meets the Company’s credit quality requirements and the Company has the ability and intent to hold these investments until they recover their unrealized losses. Inventories The Company’s inventories consist primarily of finished goods and are stated at the lower of cost or net realizable value with cost determined on a first-in, first-out basis. Provisions are made if the cost of the inventories exceeds their net realizable value. The Company evaluates inventory levels and purchase commitments for excess and obsolete products, based on management’s assessment of future demand and market conditions. Property and Equipment Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives of the assets, generally ranging between eighteen months and five years Capitalized costs are amortized using the straight-line method over the estimated useful life of the asset, which is generally two years, beginning when the asset is ready for its intended use. During the years ended December 31, 2019, 2018 and 2017, the Company amortized expenses of $1.6 million, $2.0 million and $1.1 million, respectively. Content Licensing Fees The Company licenses content for viewing on The Roku Channel. The licensing arrangements can be for a fixed fee and/or advertising revenue share with specific windows of availability. The Company capitalizes the content fees and records a corresponding liability at the gross amount of the liability when the license period begins, the cost of the content is known, and the content is accepted and available for streaming. The Company amortizes licensed content assets into “Cost of Revenue, Platform” over the contractual window of availability . As of December 31, 2019, content related expenses that met these requirements were $1.7 million. As of December 31, 2018, . Deferred Revenue The Company’s deferred revenue reflects fees received from licensing and service arrangements, including advertising, that will be recognized as revenue over time or as services are rendered. Deferred revenue balances consist of the amount of player sales allocated to unspecified upgrades or enhancements on a when-and-if available basis, licensing and services fees from service operators and TV brands, and payments from advertisers and content publishers. Deferred revenue expected to be realized within one year is classified as current liabilities and the remaining is recorded as noncurrent liabilities. Advertising Costs Advertising costs are expensed when incurred and are included in sales and marketing expense in the consolidated statements of operations. The Company incurred advertising costs of $7.3 million, $3.0 million and $3.4 million for the years December 31, 2019, 2018 and 2017, respectively. Stock-Based Compensation The Company measures compensation expense for all stock-based awards, including restricted stock units and stock options granted to employees, based on the estimated fair value of the award on the date of grant. For restricted stock units, the grant date fair value is based on the closing market price of the Company’s Class A common stock on the date of grant. The fair value of each stock option is estimated using the Black-Scholes option-pricing model. The Company accounts for forfeitures as they occur. Stock-based compensation is recognized on a straight-line basis over the requisite vesting period. Income Taxes The Company accounts for income taxes using an asset and liability approach. Deferred tax assets and liabilities are determined based on the difference between the consolidated financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts that are more likely than not to be realized. Net Loss per Share Since the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods as the inclusion of all potential common shares outstanding and potentially dilutive securities would have been anti-dilutive. Adoption of New Accounting Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02, Leases (Topic 842) (“ASC 842”) , On January 1, 2019, the Company adopted the guidance in ASC 842 using the optional transition method and recorded right-of-use (“ROU”) assets and lease liabilities on its consolidated balance sheet. As a result, periods prior to 2019 were not adjusted. On the adoption date, the Company recognized ROU assets totaling $39.9 million, lease liabilities totaling $42.1 million and reclassification of deferred and prepaid rents of $2.2 million to ROU assets on its consolidated balance sheet. There was Recently Issued Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Topic 350), Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the FASB issued ASU 2018-13, Fair Value Measurements (Topic 820), Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments

Revenue

Revenue	12 Months Ended
	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Revenue	3. REVENUE The Company adopted accounting guidance in Accounting Standards Codification, Revenue from Contracts with Customers (Topic 606) Revenue is recognized upon transfer of control of promised goods or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those goods or service The Company estimates the transaction price of a contract based on the expected value for which a significant reversal of revenue is not expected to occur. The estimate of the variable consideration is based on the assessment of historical, current, and forecasted performance noted and expected from the performance obligation. In a multiple element arrangement, the estimated transaction price of each contract is allocated to each distinct performance obligation based on a relative stand-alone selling price (“SSP”). For performance obligations routinely sold separately, the SSP is determined by evaluating such stand-alone sales. For those performance obligations that are not routinely sold separately, the Company determines SSP based on market conditions and other observable inputs. When the Company sells third-party goods and services, it evaluates whether the Company is the principal, and reports revenues on a gross basis, or an agent, and reports revenues on a net basis. In this assessment, the Company considers if it obtains control of the specified goods or services before they are transferred to the customer, as well as other indicators such as the party primarily responsible for fulfillment, inventory risk, and discretion in establishing price. Revenue is recorded net of taxes collected from customers which are subsequently remitted to the relevant government authority. The Company does not have any capitalized costs associated with contract acquisition because most direct contract acquisition costs relate to contracts that are recognized over a period of one year or less. Sales commissions are included in “Sales and marketing” expenses in the consolidated statements of operations. Nature of Products and Services Platform segment: The Company generates platform revenue from the sale of digital advertising and related services, content distribution services, subscription and transaction revenue shares, Premium Subscriptions, billing services, sale of branded channel buttons on remote controls and licensing arrangements with service operators and TV brands. The Company sells digital advertising directly to marketers or through advertising agencies. Revenue from advertising is mostly generated through video and display advertising delivered through advertising impressions. Advertising is typically sold on a cost-per-thousand (“CPM”) basis and is evidenced by an Insertion Order, (“IO”). Revenue is recognized as the number of impressions are delivered. IOs may include multiple performance obligations as they contain distinct advertising products or services. For such arrangements, the Company allocates revenue to each distinct performance obligation based on their relative SSP. The Company also generates revenue from customers using its platform. For that it charges a platform fee, which is a percentage of a customer’s advertising inventory spend during the month, along with data and any add-on features purchased through the platform. Advertising arrangements comprised of multiple performance obligations are recognized either at a point in time or over time depending on the nature of the distinct performance obligation. The Company’s content distribution revenue sharing arrangements include cash or non-cash consideration. The revenue sharing arrangements generally apply to new subscriptions for accounts that sign up for new services and at the time of a movie rental or purchase. Revenue is recognized on a net basis as the Company is deemed to be the agent between content publishers and end users. Revenue is recognized on a time elapsed basis, by day, as the services are delivered over the contractual distribution term. Non-cash consideration is usually in the form of advertising inventory, the SSP of which is determined based on relevant internal and third-party data. The Company sells monthly subscriptions for premium content on The Roku Channel for varying fees for different content. Revenue from such premium subscription fees is recognized on a gross basis over the service period as the Company is deemed to be the principal in the relationship with the end user. The Company obtains control of the content before transferring to the end user and has latitude in establishing pricing. The Company pays fixed fees to the providers of premium content on The Roku Channel based on the contractual arrangement and recognizes that as direct cost. The Company sells branded channel buttons on remote controls of streaming devices that provide one-touch access to a publishers’ content. The Company typically receives a fixed fee per button for each unit sold over a defined distribution period. Revenue is recognized on a time elapsed basis, by day, over the distribution term. The Company licenses the Roku OS, including updates and upgrades, to TV brands and service operators. The licensing revenue is recognized at a point in time, when the Company makes the intellectual property available and the control transfers to the customer. The revenue allocated to unspecified upgrades is recognized on a time elapsed basis, by day, over the service period. Professional services revenue is recognized as services are provided or accepted. Hosting fees are recognized on a time elapsed basis, by day, over the service period. Arrangements may also include marketing development funds paid to TV brands, which are reflected as a reduction to the estimated transaction price. Player segment: The Company sells the majority of its players and audio products through retail distribution channels in the U.S., including brick and mortar and online retailers, as well as through the Company’s website. Player revenue primarily consists of hardware, embedded software and unspecified upgrades on a when and if-available basis. The hardware and embedded software are considered as one performance obligation and revenue is recognized at a point in time when the control transfers to the customer. Unspecified upgrades or enhancements are available to customers on a when-and-if available basis. The Company records the allocated value of the unspecified upgrades as deferred revenue and recognizes it as player revenue ratably on a time elapsed basis over the estimated economic life of the associated players. The Company’s player revenue includes allowances for returns and sales incentives in the estimated transaction price. These estimates are based on historical experience and anticipated performance. Shipping charges billed to customers are included in revenue and the related shipping costs are included in cost of revenue. Revenue disaggregation: The Company’s disaggregated revenues are represented by the two reportable segments discussed in Note 17. The disaggregation is based on the evaluations that are regularly performed by the chief operating decision maker (“CODM”) for purposes of allocating resources and evaluating financial performance. The Company’s CODM is its Chief Executive Officer. Contract balances: Contract balances include the following (in thousands): As of December 31, 2019 2018 Accounts receivable, net $ 332,673 $ 183,078 Contract assets (included in Prepaid expenses and other current assets) 3,588 753 Deferred revenue, current portion 39,861 45,442 Deferred revenue, non-current portion 15,370 19,594 Total deferred revenue $ 55,231 $ 65,036 Accounts receivable are recorded at the amount invoiced, net of an allowance for doubtful accounts, sales returns, and sales incentives. Payment terms can vary by customer and contract. The timing of revenue recognition may differ from the timing of invoicing to customers. Contract assets are created when invoicing occurs subsequent to revenue recognition. Contract assets are transferred to accounts receivable when the right to invoice becomes unconditional. The Company’s contract assets are generally current in nature and are included in “Prepaid expenses and other current assets.” approximately $ 3.4 million during the year ended December 31, 2018 as the Company received the right to bill customers subsequent to revenue recognition. Contract liabilities are included in deferred revenue and reflect consideration invoiced prior to the completion of performance obligations and revenue recognition. Deferred revenue decreased by approximately $9.8 million during the year ended December 31, 2019 primarily due to revenue recognized of $5.0 million pursuant to customer acceptance of a milestone, and the remaining revenue recognized primarily relates to the . Revenue recognized during the year ended December 31, 2019 from amounts included in deferred revenue as of December 31, 2018 was $52.5 million. Revenue recognized during the year ended December 31, 2018 from amounts included in deferred revenue as of January 1, 2018 was $38.5 million. Revenue Allocated to Future Performance Obligations: Revenue allocated to remaining performance obligations represents estimated contracted revenue that has not yet been recognized which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods. Estimated contracted revenue was $161.1 m illion as of December 31, 2019 of which the Company expects to recognize approximately 54 % over the next 12 months and the remainder thereafter.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Business Combination	4. business combination On November 8, 2019, the Company acquired all outstanding shares of dataxu, Inc., (“dataxu”) according to the terms and conditions of the Agreement and Plan of Merger, dated as of October 22, 2019 (the “Merger Agreement”) . dataxu is a demand-side platform (“DSP”) that enables marketers to plan and buy video ad campaigns. The acquisition of dataxu’s platform complements the Company’s OTT advertising platform and enables marketers to access a single, data-driven software solution to plan, buy, and optimize their ad spend across TV and OTT providers. The total purchase consideration for dataxu was $148.4 million, which consisted of $78.7 million in cash and $69.7 million for the fair value of the Company’s 571,459 shares of common stock. Pursuant to the Merger Agreement, the Company deposited $18.8 million into an escrow account to secure certain indemnifications and other potential obligations. Of this $18.8 million, $17.5 million is included in the purchase consideration. The remaining amount is not considered part of the purchase consideration as it is utilized for post combination related activities by the Company and are recorded in general and administrative expenses in the consolidated statement of operations. The total purchase consideration includes $1.8 million contingent consideration, carrying value of which approximates its fair value due to its short-term nature. This contingent consideration is included in the escrow amount and may be transferred to dataxu shareholders if certain conditions set forth in the Merger Agreement are met. The Company incurred $3.9 million in acquisition related expenses and has recorded them in general and administrative expenses in the consolidated statement of operations. Purchase Price Allocation The preliminary allocation of the purchase consideration to tangible and intangible assets acquired and liabilities assumed is based on estimated fair values and is as follows (in thousands): Assets acquired Current assets $ 50,829 Restricted cash 1,303 Property and equipment, net 4,503 Intangible assets 70,200 Goodwill 72,733 Operating lease right-of-use assets 24,658 Other long-term assets 235 Total assets acquired 224,461 Liabilities assumed Current liabilities (51,428 ) Operating lease liabilities (24,658 ) Total liabilities assumed (76,086 ) Total preliminary purchase consideration $ 148,375 The preliminary fair value estimates of the net assets acquired are based upon preliminary calculations and valuations, and those estimates and assumptions regarding certain tangible assets acquired and liabilities assumed, the valuation of intangible assets acquired, income taxes, and goodwill are subject to change as the Company obtains additional information during the measurement period (up to one year from the acquisition date). The excess of the total consideration over the tangible assets, identifiable intangible assets, and assumed liabilities is recorded as goodwill. Goodwill is primarily attributable to expected synergies in our advertising offerings and cross-selling opportunities. Identifiable Intangible Assets The identifiable intangible assets acquired consisted of developed technology, customer relationships and tradename with estimated useful lives of 6 months to 6 years. The Company amortizes the fair value of these intangible assets on a straight-line basis over their respective useful lives. The fair value of the intangible assets has been estimated using the income approach in which the after-tax cash flows are discounted to present value. The key valuation assumptions include the Company's estimates of revenue growth projections and discount rates. The valuation of the intangible assets acquired from dataxu along with their estimated useful lives, is as follows (in thousands): Estimated Fair Value Estimated Useful Lives (in years) Developed technology $ 56,400 6.0 Customer relationships 13,400 4.0 Tradename 400 0.5 Estimated fair value of acquired intangible assets $ 70,200 Taxes The goodwill recorded is not deductible for tax purposes. In connection with the acquisition, a deferred tax liability is established for the book/tax differences related to non-goodwill intangible assets. The deferred tax liability is not reflected as the Company also acquired deferred tax assets, including significant net operating losses, that offset the deferred tax liability. Additionally, both companies have full valuation allowances recorded against their respective deferred tax assets, resulting in a net zero adjustment to deferred taxes on the consolidated balance sheet. Unaudited Pro Forma Results The unaudited pro forma financial information in the table below summarizes the combined results of operations for Roku and dataxu, as if the companies were combined as of the beginning of fiscal 2018. The unaudited pro forma financial information for all periods presented included the business combination accounting effects resulting from this acquisition, mainly including adjustments to reflect the adoption of ASC 842 and ASC 606, additional amortization expense from acquired intangible assets, additional stock-based compensation expense, elimination of historical interest expense associated with dataxu’s historical convertible notes and indebtedness and the related tax effects as though dataxu was combined as of the beginning of fiscal 2018. The unaudited pro forma financial information as presented below is for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisitions had taken place at the beginning of fiscal 2018. The unaudited pro forma financial information for fiscal 2018 combines the historical results of the Company and dataxu for their respective year ended December 31, 2018. Both years include the The unaudited pro forma financial information was as follows (in thousands): For the Year Ended December 31, 2019 2018 Total Revenues $ 1,218,403 $ 884,286 Pretax loss (87,654 ) (39,919 ) Net loss (86,791 ) (39,670 ) The Company recorded $16.8 million in revenue, $10.2 million in cost of revenue and $6.6 in gross profit in the Company’s consolidated statement of operations from the acquisition date of November 8, 2019 to December 31, 2019.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	5. GOODWILL AND INTANGIBLE ASSETS Goodwill Goodwill represents the excess of purchase consideration in a business combination over the fair value of tangible and Intangible Assets The following table is the summary of Company’s intangible assets (in thousands): As of December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted-Average Useful Lives (in years) Developed technology $ 62,367 $ (2,860 ) $ 59,507 5.9 Customer relationships 13,400 (558 ) 12,842 4.0 Tradename 400 (133 ) 267 0.5 Patents 4,076 (24 ) 4,052 14.0 Intangible assets $ 80,243 $ (3,575 ) $ 76,668 As of December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted-Average Useful Lives (in years) Developed technology $ 2,215 $ (738 ) $ 1,477 4.0 Intangible assets $ 2,215 $ (738 ) $ 1,477 During the year ended December 31, 2019, the Company acquired $70.2 million of developed technology, customer relationships, and tradename as a part of the dataxu acquisition. Additionally, during the year ended December 31, 2019, the Company acquired $4.1 million of patents and $3.8 million of developed technology in form of asset acquisitions. The Company recorded expenses of $2.8 million, $0.6 million and $0.2 million for amortization of intangible assets during the years ended December 31, 2019, 2018 and 2017, respectively. In the year ended December 31, 2019, the Company recorded amortization of developed technology in cost of revenue, platform, cost of revenue, player, research and development, and general and administrative expenses in the consolidated statement of operations and recorded amortization of customer relationships and tradename in sales and marketing expenses in the consolidated statement of operations. In the years ended December 31, 2018 and 2017, the Company recorded amortization of developed technology on research and development expenses in the consolidated statement of operations. The estimated future amortization expense for intangible asset for the next five years and thereafter is as follows (in thousands): Year Ending December 31, 2020 $ 14,487 2021 14,036 2022 13,666 2023 13,108 2024 10,316 Thereafter 11,055 Total $ 76,668

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	6. Balance sheet components Accounts Receivable, net : Accounts receivable, net consisted of the following (in thousands): As of December 31, 2019 2018 Gross accounts receivable $ 360,194 $ 204,975 Allowance for sales returns (6,550 ) (7,335 ) Allowance for sales incentives (19,476 ) (13,750 ) Other allowances (1,495 ) (812 ) Total allowances (27,521 ) (21,897 ) Total Accounts Receivable—net of allowances $ 332,673 $ 183,078 Allowance for Sales Returns : Allowance for sales returns consist of the following activities (in thousands): As of December 31, 2019 2018 Beginning balance $ (7,335 ) $ (6,907 ) Charged to revenue (15,541 ) (17,396 ) Utilization of sales return reserve 16,326 16,968 Ending balance $ (6,550 ) $ (7,335 ) Allowance for Sales Incentive : Allowance for sales incentive consisted of the following activities (in thousands): As of December 31, 2019 2018 Beginning balance $ (13,750 ) $ (10,442 ) Charged to revenue (65,676 ) (50,958 ) Utilization of sales incentive reserve 59,950 47,650 Ending balance $ (19,476 ) $ (13,750 ) Property and Equipment, net : Property and equipment, net consisted of the following (in thousands): As of December 31, 2019 2018 Computers and equipment $ 23,834 $ 16,056 Leasehold improvements 93,239 18,396 Website and internal-use software 6,510 6,423 Office equipment and furniture 12,091 4,069 Total property and equipment 135,674 44,944 Accumulated depreciation and amortization (32,412 ) (19,680 ) Property and Equipment, net $ 103,262 $ 25,264 Depreciation and amortization expense, for property and equipment assets, for the years ended December 31, 2019, 2018 and 2017 was $12.8 million, $7.8 million and $5.2 million, respectively. Accrued Liabilities : Accrued liabilities consisted of the following (in thousands): As of December 31, 2019 2018 Payments due to content publishers $ 57,376 $ 32,463 Accrued cost of revenue 58,149 22,830 Operating lease liability, current 17,896 — Accrued royalty expense 18,040 7,939 Accrued payroll and related expenses 14,522 12,217 Accrued inventory 2,892 6,008 Marketing, retail and merchandising costs 7,624 — Accrued legal expenses 3,158 — Customer prepayments 2,669 3,124 Taxes and related liabilities 3,052 1,314 Other accrued expenses 12,969 6,091 Total Accrued Liabilities $ 198,347 $ 91,986 Deferred Revenue : Deferred revenue consisted of the following (in thousands): As of December 31, 2019 2018 Platform, current $ 18,234 $ 28,569 Player, current 21,627 16,873 Total deferred revenue, current 39,861 45,442 Platform, non-current 6,135 12,783 Player, non-current 9,235 6,811 Total deferred revenue, non-current 15,370 19,594 Total Deferred Revenue $ 55,231 $ 65,036

Short-Term Investments

Short-Term Investments	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Short-Term Investments	7. SHORT-TERM INVESTMENTS The Company did not have any short-term investments as of December 31, 2019. The following is a summary of the Company’s short-term investments as of December 31, 2018 (in thousands): As of December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Corporate bonds and commercial paper $ 37,168 $ — $ (17 ) $ 37,151 U.S. government securities 4,995 — — $ 4,995 Total Short-Term Investments $ 42,163 $ — $ (17 ) $ 42,146 The following table summarizes the maturities of the Company’s short-term investments by contractual maturity (in thousands): As of December 31, 2018 Amortized Cost Fair Value Less than 1 year $ 42,163 $ 42,146 Due in 1-3 years — — Total Short-Term Investments $ 42,163 $ 42,146

Fair Value Disclosure

Fair Value Disclosure	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosure	8. FAIR VALUE DISCLOSURE The Company’s financial assets measured at fair value are as follows (in thousands): As of December 31, 2019 As of December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 463,820 $ 463,820 $ — $ 147,221 $ 147,221 $ — Money market funds 51,659 51,659 — 8,343 8,343 — Restricted cash 1,854 1,854 — — — — Short-term investments: Corporate bonds and commercial paper — — — 37,151 — 37,151 U.S. government securities — — — 4,995 — 4,995 Total assets measured and recorded at fair value $ 517,333 $ 517,333 $ — $ 197,710 $ 155,564 $ 42,146 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal market (or most advantageous market, in the absence of a principal market) for the asset or liability in an orderly transaction between market participants at the measurement date. Further, the Company maximizes the use of observable inputs and minimizes the use of unobservable inputs in measuring fair value, and to utilize a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The three levels of inputs used to measure fair value are as follows: Level 1 —Quoted prices in active markets for identical assets or liabilities. Financial assets and liabilities measured using Level 1 inputs include cash equivalents, accounts receivable, prepaid expenses, accounts payable and accrued liabilities. The Company considers all highly liquid investments purchased with an original or remaining maturity of 90 days or less at the date of purchase to be cash equivalents. The Company measured money market funds of $51.7 million and $8.3 million as cash equivalents as of December 31, 2019 and 2018, respectively, using Level 1 inputs. Level 2 —Observable inputs other than quoted prices included within Level 1, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; and inputs other than quoted prices that are observable or are derived principally from, or corroborated by, observable market data by correlation or other means. The Company measured its short-term investments using Level 2 inputs. Level 3 —Unobservable inputs that are supported by little or no market activity, are significant to the fair value of the assets or liabilities and reflect the Company’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The Company did not have Level 3 instruments at December 31, 2019 and 2018. During the year ended December 31, 2017, Level 3 instruments consisted of the Company’s convertible preferred stock warrant liability. Pursuant to the Company’s IPO in October 2017, all convertible preferred stock warrants were converted into Class B common stock warrants, which did not require further re-measurements as they were deemed permanent equity. For periods prior to the IPO, the Company’s convertible preferred stock warrant liability was measured at fair value upon issuance and at each reporting date prior to the IPO. The inputs that were used to determine the estimated fair value of the convertible preferred stock warrant liability included the remaining contractual term of the warrants, the risk-free interest rate, the volatility of comparable public companies over the remaining term, and the fair value of underlying shares. The significant unobservable inputs used in the fair value measurement of the convertible preferred stock warrant liability were the fair value of the underlying stock at the valuation date and the estimated term of the warrants. The following table represents the activity of Level 3 instruments (in thousands): Year Ended December 31, 2017 Convertible preferred stock warrant liability — beginning balance $ 9,990 Fair value of new warrants issued 2,032 Change in fair value of preferred stock warrant liability* 40,333 Reclassification to additional paid in capital upon conversion to common warrants (52,355 ) Convertible preferred stock warrant liability — ending balance $ — * Recognized in the consolidated statements of operations within other income (expense), net. Assets and liabilities that are measured at fair value on a non-recurring basis Non-financial assets such as goodwill, intangible assets, property, plant, and equipment and operating lease right-of-use assets are evaluated for impairment and adjusted to fair value using Level 3 inputs, only when impairment is recognized. The Company recorded an impairment of $0.9 million for operating lease right-of-use assets and $0.4 million for long-lived assets that were no longer in use during the years ended December 31, 2019 and 2018, respectively. There were no indicators of impairment that required a fair value analysis during the year ended December 31, 2017.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	9. LEASES The Company determines if an arrangement contains a lease at its inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, accrued liabilities, and operating lease liability in our consolidated balance sheets. represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. The Company has entered into operating leases primarily for office real estate. The leases have remaining terms ranging from one year to 11 years and may include options to extend or terminate the lease. The Company earns sublease income from subleases for a portion of the former headquarters in Saratoga, California. The subleases expire in 2020 when the underlying leases expire. The components of lease expense are as follows (in thousands): Year Ended December 31, 2019 Operating lease cost $ 30,218 Sublease income (2,622 ) Net operating lease cost $ 27,596 Supplemental cash flow information related to leases is as follows (in thousands): Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 17,721 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 267,048 Supplemental balance sheet information related to leases was as follows (in thousands, except lease term and discount rate): As of December 31, 2019 Operating lease right-of-use assets $ 283,291 Included in accounts payable and accrued liabilities: Operating lease liability, current 17,896 Operating lease liability, non-current 301,694 Total operating lease liability $ 319,590 Weighted Average Remaining Lease Term: Operating leases (in years) 9.98 Weighted Average Discount Rate: Operating leases 4.65 % Future lease payments under operating leases as of December 31, 2019 were as follows (in thousands): Year Ending December 31, Operating Leases 2020 $ 29,230 2021 47,035 2022 43,909 2023 44,655 2024 44,014 Thereafter 246,488 Total future lease payments 455,331 Less: imputed interest (95,762 ) Less: expected tenant improvement allowance (39,979 ) Total $ 319,590 As of December 31, 2019, the Company has additional operating leases, primarily corporate offices, that have not yet commenced of $6.6 million. These operating leases will commence in fiscal year 2020 with lease terms of 5 years to 11 years. The following table summarizes the future minimum lease payments due under operating leases as of December 31, 2018 and reflect the application of the prior lease standard (ASC 840, Leases). These amounts were disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (in thousands): Year Ending December 31, Operating Leases 2019 $ 16,817 2020 29,124 2021 32,034 2022 32,844 2023 33,414 Thereafter 223,472 Less: sublease income (3,711 ) Total $ 363,994 Rent expense, under ASC 840, for the years ended December 31, 2018 and 2017 was $9.7 million and $6.9 million, respectively.

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	10. DEBT The Company’s outstanding debt as of December 31, 2019 is as follows (in thousands): As of December 31, 2019 Amount Effective Interest Rate Term Loan A Facility $ 100,000 3.48 % Less: Debt issuance costs (392 ) Net carrying amount of debt $ 99,608 The carrying amount of debt approximates fair value due to its variable interest rates. The Company did not have any outstanding debt as of December 31, 2018. The following table sets forth the Company’s interest expense recognized in relation to the debt (in thousands): Year Ended December 31, 2019 Contractual interest expenses related to Term Loan A Facility $ 420 Amortization of debt issuance costs 11 Total interest expense $ 431 Senior Secured Term Loan A and Revolving Credit Facilities On February 19, 2019 (the “Original Closing Date”), the Company entered into a Credit Agreement (the “Existing Credit Agreement”) with Morgan Stanley Senior Funding, Inc. On May 3, 2019, (the “Closing Date”), the Existing Credit Agreement was amended pursuant to an Incremental Assumption and Amendment No. 1 (the “Amendment” and the Existing Credit Agreement as amended by the Amendment, the “Credit Agreement”). On the Original Closing Date, the Company terminated its Restated 2014 LSA (as defined below) with Silicon Valley Bank. The Credit Agreement provides for (i) a four-year four-year Credit Facility (together with the Revolving Credit Facility and the Term Loan A Facility, collectively, the “Credit Facility”). On November 18, 2019, the Company drew from the Term Loan A facility in the aggregate principal amount of $100.0 million and elected a Eurodollar borrowing with interest at a rate equal to the adjusted one-month LIBOR rate plus an applicable margin of 1.75% based on the Company’s secured leverage ratio. Loans under the Term Loan A Facility will amortize in equal quarterly installments beginning on March 31, 2020, in an aggregate annual amount equal to (i) on or prior to December 31, 2021, 1.25% of the drawn principal amount of the Term Loan Facility or $1.25 million and (ii) thereafter, 2.50% of the drawn principal amount of the Term Loan Facility or $2.5 million, with the remaining balance payable on the maturity date of the Term Loan A Facility in February 2023. The Company did not have any borrowings outstanding on the Revolving Credit Facility as of December 31, 2019. The Company had outstanding letters of credit as of December 31, 2019, totaling $30.7 million, which reduced the balance available to draw on the Revolving Credit Facility from $100.0 million to $69.3 million. The Company’s obligations under the Credit Agreement are secured by substantially all of its assets. In the future, certain of its direct and indirect subsidiaries may be required to guarantee the Credit Agreement. The Company may prepay, and in circumstances is required to prepay, loans under the Credit Agreement without payment of a premium. The Credit Agreement contains customary representations and warranties, customary affirmative and negative covenants, a financial covenant that is tested quarterly and requires the Company to maintain a certain adjusted quick ratio of at least 1.00 to 1.00, and cu stomary events of default. As of December 31, 2019, the Company is in compliance with all the covenants of the Credit Agreement. Line of Credit with Silicon Valley Bank The Company entered into a loan and security agreement (the “LSA”) with Silicon Valley Bank in July 2011. The LSA was amended and restated in subsequent periods. The amended and restated loan and security agreement (the “Restated 2014 LSA”) entered into in November 2014 provided advances under a revolving line of credit up to $30.0 million and provided for letters of credit to be issued up to $5.0 million. In June 2017, the Company entered into a second amendment to the Restated 2014 LSA (such amendment, the “Second Amendment”). Advances under the Second Amendment carry a floating per annum interest rate equal to, at the Company’s option, (1) the prime rate or (2) LIBOR plus 2.75%, or the prime rate plus 1% depending on certain ratios. The Second Amendment further changed the financial covenant to maintain a current ratio (calculated as current assets, divided by current liabilities less deferred revenue) greater than or equal to 1.25. As of December 31, 2018, the Company was in compliance with all of the covenants in the amended Restated 2014 LSA. On July 18, 2018, the Company entered into a third amendment to the Restated 2014 LSA (such amendment, the “Third Amendment”). The Third Amendment increased the amount by which the Company could utilize its line of credit to support the issuances of letters of credits from $5.0 million to $30.0 million. On February 19, 2019, the Company terminated the Restated 2014 LSA agreement with Silicon Valley Bank.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Stockholders' Equity	11. STOCKHOLDERS’ EQUITY Preferred Stock The Company has 10 million shares of undesignated preferred stock authorized but not issued with rights and preferences determined by the Company’s Board of Directors at the time of issuance of such shares. As of December 31, 2019 and 2018, there were no shares of preferred stock issued and outstanding. Common Stock The Company has two At-the-Market Offerings On March 12, 2019, the Company entered into an Equity Distribution Agreement with Citigroup Global Markets Inc., as its sales agent (the “Citi Equity Distribution Agreement”), pursuant to which the Company could issue and sell from time-to-time shares of its Class A common stock for aggregate gross proceeds of up to $100.0 million. In March 2019, the Company sold approximately 1.4 million shares of Class A common stock at an average selling price of $72.00 per share, constituting all available shares for sale under the Citi Equity Distribution Agreement for aggregate gross proceeds of $100.0 million and incurred issuance costs of $2.0 million. On May 16, 2019, the Company entered into an Equity Distribution Agreement with Morgan Stanley & Co. LLC, as its sales agent (the “MS Equity Distribution Agreement”), pursuant to which the Company could issue and sell up to an aggregate of 1.0 million shares of its Class A common stock. In May 2019, the Company sold all 1.0 million available shares for sale under the MS Equity Distribution Agreement at an average selling price of $82.90 per share, for aggregate gross proceeds of $82.9 million and incurred issuance costs of $1.6 million. On November 19, 2019, the Company entered into another Equity Distribution Agreement with Citigroup Global Markets Inc. as its sales agent (the “Citi Equity Distribution Agreement – 2”), pursuant to which the Company could issue and sell from time-to-time up to an aggregate of 1.0 million shares of its Class A common stock. In November 2019, the Company sold all 1.0 million shares available for sale under the Citi Equity Distribution Agreement – 2 at an average selling price of $153.99 per share for aggregate gross proceeds of $153.99 million and incurred issuance costs of $2.8 million. Common Stock Reserved For Issuance At December 31, 2019, the Company had reserved shares of common stock for issuance as follows (in thousands): As of December 31, 2019 Common stock awards granted under equity incentive plans 15,668 Common stock awards available for issuance under the 2017 Employee Stock Purchase Plan * 2,089 Common stock awards available for issuance under the 2017 Equity Incentive Plan 16,950 Total reserved shares of common stock 34,707 * The Company has not issued any common stock pursuant to the 2017 Employee Stock Purchase Plan. Equity Incentive Plans The Company has two equity incentive plans, the 2008 Equity Incentive Plan (the “2008 Plan”) and the 2017 Equity Incentive Plan (the “2017 Plan”). The 2017 Plan became effective September 2017 in connection with the IPO. No further shares have been issued under the 2008 Plan. The 2017 Plan provides for the grant of incentive stock options to the Company’s employees and for the grant of non-statutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of equity compensation to the Company’s employees, directors and consultants. Restricted stock units granted under the plan are subject to continuous service. Options granted under the plans are granted at a price per share equivalent to the fair market value on the date of grant. Recipients of option grants who possess more than 10% of the combined voting power of the Company (a “10% Shareholder”) are subject to certain limitations, and incentive stock options granted to such recipients are at a price no less than 110% of the fair market value at the date of grant. Restricted Stock Units Restricted stock unit activity for the year ended December 31, 2019 is as follows (in thousands, except per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Balance, December 31, 2018 3,686 $ 48.50 Awarded 2,228 87.60 Released (822 ) 49.26 Forfeited (548 ) 50.40 Balance, December 31, 2019 - outstanding 4,544 $ 67.30 The grant-date fair value of restricted stock units granted during the year ended December 31, 2019 was $195.2 million. Total unrecognized compensation cost related to restricted stock units awarded to employees as of December 31, 2019 was $267.7 million, which the Company expects to recognize over 2.77 years. The intrinsic value of restricted stock units that vested in the years ended December 31, 2019 and 2018 was $100.1 million and $12.7 million, respectively, which represented the fair value of the Company’s common stock underlying the restricted stock units on their vesting date. Stock options The following table summarizes the Company’s stock option activities under the 2008 Plan and 2017 Plan (in thousands, except per share data): Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Weighted Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Balance, December 31, 2018 16,371 $ 8.59 6.8 — Granted 572 100.06 — $ 39.23 Exercised (5,352 ) 5.35 — — Forfeited and expired (467 ) 8.77 — — Balance, December 31, 2019 - outstanding 11,124 $ 14.84 6.2 — $ 1,324,461 Options exercisable at December 31, 2019 6,603 $ 5.84 5.1 — $ 845,590 The weighted average grant-date fair value of stock options granted during the years ended December 31, 2019, 2018 and 2017 was $39.23, $22.96 and $3.73, respectively. The total intrinsic value of stock options exercised in the years ended December 31, 2019, 2018 and 2017 was $474.2 million, $445.9 million and $20.4 million, respectively, and represents the difference between the fair value of the Company’s common stock at the dates of exercise and the exercise price of the options. As of December 31, 2019, the Company had $41.2 million of unrecognized stock compensation expense related to unvested stock options that is expected to be recognized over a weighted-average period of approximately 1.78 years. Stock-based Compensation The Company measures the cost of employee services received in exchange for an equity award based on the grant date fair value of the award. Generally, stock options granted to employees vest 25% after one year and then 1/48th monthly thereafter and have a term of ten years, and restricted stock units issued generally vest 25% after one year and then 1/16th quarterly thereafter. The following table shows total stock-based compensation expense included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2019, 2018 and 2017 (in thousands): Years Ended December 31, 2019 2018 2017 Cost of platform revenue $ 342 $ 97 $ 81 Cost of player revenue 1,072 469 145 Research and development 40,036 18,538 4,714 Sales and marketing 24,179 10,459 2,817 General and administrative 19,546 8,111 3,196 Total stock-based compensation $ 85,175 $ 37,674 $ 10,953 The fair value of options granted under the 2008 Plan and 2017 Plan is estimated on the grant date using the Black-Scholes option-valuation model. This valuation model for stock-based compensation expense requires the Company to make certain assumptions and judgments about the variables used in the calculation, including the expected term, the expected volatility of the Company’s common stock, an assumed risk-free interest rate, and expected dividends. The Company recognizes forfeitures as they occur. Fair Value of Common Stock: Prior to our IPO, the fair value of the common stock underlying our stock options was determined by our Board of Directors. The valuations of our common stock were determined in accordance with the guidelines outlined in the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately-Held-Company Equity Securities Issued as Compensation. Our Board of Directors, with input from management, exercised significant judgment and considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date, including but not limited to the prices, rights, preferences and privileges of our preferred stock relative to the common stock, our operating and financial performance, current business conditions and projections, our stage of development, likelihood of achieving a liquidity event for the shares of common stock underlying these stock options, such as an IPO or sale of our company, given prevailing market conditions, any adjustment necessary to recognize a lack of marketability of the common stock underlying the granted options, the market performance of comparable publicly-traded companies, the U.S. and global capital market conditions. Subsequent to our IPO, the Company uses the market closing price for our Class A common stock as reported on The Nasdaq Global Select Market on the date of grant. The Company uses the straight-line method for expense recognition. Expected Term: The Company’s expected term represents the period that the Company’s stock-based awards are expected to be outstanding and is determined based on the simplified method as described in ASC Topic 718-10-S99-1, . Expected Volatility: The Company’s volatility factor is estimated using several comparable public company volatilities for similar option terms. Expected Dividends: The Company has never paid cash dividends and has no present intention to pay cash dividends in the future, and as a result, the expected dividends are $0. Risk-Free Interest Rate: The Company bases the risk-free interest rate on the implied yield currently available on U.S. Treasury zero coupon issues with a remaining term equivalent to the estimated life of the stock-based awards. Where the expected term of the Company’s stock-based awards does not correspond with the term for which an interest rate is quoted, the Company performs a straight-line interpolation to determine the rate from the available term maturities. The assumptions used to value stock-based awards granted during the years ended December 31, 2019, 2018 and 2017 are as follows: Years Ended December 31, 2019 2018 2017 Dividend rate — — — Expected term (in years) 5.0 - 6.7 5.3 - 6.8 5.3 - 6.5 Risk-free interest rate 1.35 - 2.56% 2.32 - 2.88% 1.87 - 2.25% Expected volatility 35 - 36% 38 - 40% 39 - 44% Fair value of common stock — — $2.56 - $18.46 Stock Warrants The Company does not have any outstanding warrants as of December 31, 2019 and 2018. In July 2017 the Company issued 0.4 million shares of Class B common stock upon exercise of 0.4 million Class B common stock warrants issued in 2009. The fair value of the convertible preferred stock warrants was recorded as a liability and was remeasured at the end of each balance sheet date using the Black-Scholes option pricing model. The Company revalued the convertible preferred stock warrants as of the completion of the IPO and reclassified the outstanding preferred stock warrant liability balance to additional paid-in capital with no further re-measurement required as Class B common stock warrants are considered permanent equity. Changes in the fair value of the convertible preferred stock warrants were recognized in the consolidated statements of operations. The Company valued the convertible preferred stock warrants using the following assumptions: Year Ended December 31, 2017 Dividend rate — Expected term (in years) 3.0 - 9.7 Risk-free interest rate 1.5 - 2.3% Expected volatility 44 - 51% After conversion into warrants to purchase shares of Class B common stock, 1.9 million warrants were exercised and 0.1 million shares were cancelled during the year ended December 31, 2017. The warrant agreements allowed for net settlement for Class B common stock. As a result, the Company issued 1.8 million shares of Class B common stock upon exercise. As of December 31, 2017, warrants to purchase 0.2 million shares of Class B common stock were outstanding, which were exercised during the year ended December 31, 2018.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	12. COMMITMENTS AND CONTINGENCIES Manufacturing Purchase Commitments The Company has various manufacturing contracts with vendors in the conduct of the normal course of its business. In order to manage future demand for our products, the Company enters into agreements with manufacturers and suppliers to procure inventory based upon certain criteria and timing. Some of these commitments are non-cancelable. As of December 31, 2019 and 2018, the Company had $55.7 million and $40.6 million purchase commitments for inventory, respectively. The Company records a liability for non-cancelable purchase commitments in excess of projected demand forecasts. The Company recorded $0.3 million and $0.1 million for these purchase commitments in “Accrued liabilities” at December 31, 2019 and 2018, respectively. Content License Purchase Commitments At December 31, 2019, the Company recorded $1.7 million as obligations in “Accrued liabilities” for license purchase commitments. The obligations for the year ended December 31, 2018 were not material. As of December 31, 2019, the Company did not have any remaining performance obligations that Letters of Credit As of December 31, 2019, the Company had irrevocable letters of credit outstanding in the amount of $31.8 million for the benefit of landlords related to non-cancelable facilities leases. The letters of credit expire on various dates in 2030. Contingencies The Company accrues for loss contingencies, including liabilities for intellectual property licensing claims, when it believes such losses are probable and reasonably estimable. During the year ended December 31, 2019, the Company recorded expenses of $9.9 million, in total cost of revenue, for various claims related to patent infringements. The expense includes accruals based on best estimates and are subject to adjustments in the future. During the year ended December 31, 2018, the Company changed its estimate of certain liabilities previously recorded for intellectual property licensing and released $8.9 million as a result of its assessment that the likelihood of payment is now remote. The reversal of $8.9 million is recorded within cost of revenue, player during the year ended December 31, 2018, in the consolidated statements of operations. From time to time, the Company is subject to legal proceedings, claims, and investigations in the ordinary course of business, including claims relating to employee relations, business practices and patent infringement. The Company is involved in litigation matters not listed herein. Although the results of these proceedings, claims, and investigations cannot be predicted with certainty, the Company does not believe that the final outcome of any matters that it is currently involved in are reasonably likely to have a material adverse effect on its business, financial condition, or results of operations. Indemnification In the ordinary course of business, the Company has entered into contractual arrangements which provide indemnification provisions of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the Company’s breach of such agreements and out of intellectual property infringement claims made by third parties. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each agreement. To date, the Company has not incurred any material costs as a result of such obligations and have not accrued any liabilities related to such obligations in the consolidated financial statements.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	13. INCOME TAXES The components of loss before income taxes consist of the following (in thousands): Years Ended December 31, 2019 2018 2017 United States $ (63,453 ) $ (11,128 ) $ (63,831 ) Foreign 2,534 1,795 637 Net loss before income taxes $ (60,919 ) $ (9,333 ) $ (63,194 ) The income tax (benefit) expense consisted of the following (in thousands): Years Ended December 31, 2019 2018 2017 Current: Federal $ (47 ) $ — $ — State 244 114 89 Foreign 108 184 674 305 298 763 Deferred: Foreign (1,287 ) (774 ) (448 ) Total $ (982 ) $ (476 ) $ 315 The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate: Years Ended December 31, 2019 2018 2017 U.S. federal income tax at statutory rate 21.0 % 21.0 % 34.0 % U.S. state and local income taxes (0.4 ) (1.3 ) (0.2 ) Change in valuation allowance (213.4 ) (1,039.4 ) 19.0 Federal research and development tax credit 30.8 166.2 5.2 Convertible preferred stock warrants — — (21.7 ) Stock-based compensation 158.0 859.4 1.2 Meals and Entertainment (1.4 ) (6.6 ) (1.1 ) Permanent items — (1.1 ) — Foreign rate differential (0.6 ) (1.5 ) 0.2 Acquisition costs (1.3 ) — — Section 162(m) limitation (1.4 ) — — State apportionment change 1.3 — — Tax rate change (0.4 ) 2.4 (36.4 ) Provision to return true-up 9.9 5.9 — Other (0.5 ) 0.1 (0.7 ) Effective tax rate 1.6 % 5.1 % (0.5 )% Significant components of the Company’s deferred income tax assets and liabilities consist of the following (in thousands): As of December 31, 2019 2018 Deferred tax assets: Net operating loss carryforwards $ 263,512 $ 128,829 Reserves and accruals 10,425 7,840 Research and development credits 73,442 39,344 Lease Obligation 81,639 — Stock-based compensation 17,494 7,529 Total deferred tax assets 446,512 183,542 Deferred tax liabilities: Right-of-use asset (72,243 ) — Depreciation and amortization (10,916 ) (343 ) Total deferred tax liabilities (83,159 ) (343 ) Valuation allowance (361,233 ) (182,360 ) Net deferred tax assets $ 2,120 $ 839 A valuation allowance is provided when it is more likely than not that some portion of the deferred tax assets will not be realized through future operations. As a result of the Company’s analysis of all available objective evidence, both positive and negative, as of December 31, 2019, management believes it is more likely than not that the deferred tax assets will not be fully realizable. Accordingly, the Company has provided a full valuation allowance against its deferred tax assets with the exception of deferred tax assets related to foreign entities in the U.K. and Denmark. The Company's valuation allowance increased by $178.9 million and $114.1 million during the years ended December 31, 2019 and 2018, respectively, primarily due to U.S. federal and state tax losses and credits incurred during the period. For federal and state income tax reporting purposes, respective net operating loss carryforwards of $1,005.4 million and $851.7 million are available to reduce future taxable income, if any. These net operating loss carryforwards will begin to expire in 2028 for federal and certain state net operating losses have expired in 2019 . The federal net operating loss generated subsequent to 2017 can be carried forward indefinitely. For U.K. and Denmark income tax reporting purposes, the net operating loss carryforward of $9.4 million and $0.1 million, respectively, is available to reduce the future taxable income, if any. U.K. and Denmark net operating loss can be carried forward indefinitely. The Company also has U.K. research and development tax credit carryforwards of $0.2 million. The credit can be carried forward indefinitely. As of December 31, 2019, the Company has research and development tax credit carryforwards of $58.3 million and $40.0 million for federal and state income tax purposes, respectively. If not utilized, the federal and state carryforwards will begin to expire in 2028 and 2035, respectively. The Internal Revenue Code of 1986, as amended (the “Code”), contains provisions that may limit the net operating loss and credit carryforwards available for use in any given period upon the occurrence of certain events, including a statutorily defined significant change in ownership. Utilization of the net operating loss and tax credit carryforwards is subject to an annual limitation due to an ownership change, as defined by section 382 of the Code. The Company has assessed whether any section 382 ownership change has occurred since its formation and determined that a section 382 ownership change occurred on December 18, 2009 and tax attributes generated by the Company through the ownership change date are subject to the limitation. A Section 382 study was completed for dataxu covering the period from inception beginning May 1, 2008 through acquisition date of November 8, 2019. Based on the study, the Company identified four ownership changes for Section 382 purposes. As such, tax attributes generated by dataxu through the ownership change dates are subject to the limitation. The total amount of unrecognized tax benefits as of December 31, 2019 is $19.5 million, of which $18.3 million is composed of research and development credits and $1.2 million is related international activities. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): As of December 31, 2019 2018 Unrecognized tax benefits at beginning of year $ 14,541 $ 5,843 Gross increase for tax positions of current year 10,378 7,053 Gross decrease due to statue expiration (88 ) — Gross increase for tax positions of prior years — 1,645 Gross decrease for tax positions of prior years (5,344 ) — Unrecognized tax benefits balance at end of year $ 19,487 $ 14,541 The Company recognizes interest and penalties related to unrecognized tax benefits as a component of its income tax expense. As of December 31, 2019, the Company recorded $0.3 million of accrued interest and penalties related to uncertain tax positions. Change in the Company’s unrecognized tax benefits, if any, would have an immaterial impact on its effective tax rate. The Company does not believe unrecognized tax benefits will change significantly in the next 12 months. The Company files income tax returns in the U.S. federal jurisdiction and various state jurisdictions. In the normal course of business, the Company is subject to examination by taxing authorities. These audits include questioning the timing and amount of deductions; the nexus of income among various tax jurisdictions; and compliance with federal, state, and local tax laws. The Company is not currently under audit by the Internal Revenue Service or other similar state and local authorities. All tax years remain open to examination by major taxing jurisdictions to which the Company is subject. The Company will continue to reinvest earnings from our foreign subsidiaries indefinitely. While federal income tax expense has been recognized as a result of the Tax Cuts and Jobs Act of 2017, the Company has not provided any additional deferred taxes with respect to items such as foreign withholding taxes, state income tax or foreign exchange gain or loss. It is not practicable for the Company to determine the amount of unrecognized tax expense on these reinvested international earnings.

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	14. RELATED-PARTY TRANSACTIONS The Company has engaged in transactions with one of its strategic investors. With respect to this investor, the Company recorded revenue of $8.5 million, $4.1 million and $0.6 million for the years ended December 31, 2019, 2018 and 2017 respectively. The Company had an accounts receivable balance of $2.4 million as of December 31, 2019 and 2018, related to transactions with this investor. The Company incurred expenses of $1.3 million, $1.3 million and $0.2 million with this investor for the years ended December 31, 2019, 2018 and 2017, respectively. The Company had a payable of $0.4 million and $1.5 million to this investor as of December 31, 2019 and 2018, respectively. In addition, the Company has engaged in transactions with another company in which the Company’s Chief Executive Officer holds a majority voting interest and is a member of such company’s board of directors, and another member of the Company’s Board of Directors is such company’s Chief Executive Officer. With respect to transactions with this other company, the Company incurred expenses of $1.2 million for the year ended December 31, 2019. The Company did not consummate any transactions with the other company for the years ended December 31, 2018 and 2017. There were no outstanding amounts payable to this other company as of December 31, 2019, 2018 and 2017.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Retirement Plans	15. RETIREMENT PLANS The Company maintains a 401(k) tax deferred saving plan (the “Savings Plan”) for the benefit of qualified employees. Qualified employees may elect to make contributions to the Savings Plan on a biweekly basis, subject to certain limitations. The Company may make contributions to the Savings Plan at the discretion of the Board of Directors. No contributions were made for the years ended December 31, 2019, 2018 and 2017. In 2014, the Company established a defined contribution plan in the U.K. for its U.K.-based employees. The Company contributed $0.5 million, $0.4 million and $0.3 million to the plan for the years ended December 31, 2019, 2018 and 2017, respectively.

Net Loss Per Share

Net Loss Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Net Loss Per Share	16. NET LOSS PER SHARE The Company’s basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period. For purposes of the calculation of diluted net loss per share options to purchase common stock, restricted stock units, unvested shares of common stock issued upon the early exercise of stock options and business acquisitions and warrants to purchase common stock are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share as their effect is antidilutive. Because the Company has reported a net loss for the years ended December 31, 2019, 2018 and 2017, diluted net loss per common share is the same as the basic net loss per share for those years. The table presents the calculation of basic and diluted net loss per share as follows (in thousands, except per share data): Years Ended December 31, 2019 2018 2017 Numerator: Net loss allocable to common stockholders $ (59,937 ) $ (8,857 ) $ (63,509 ) Denominator: Weighted-average shares used in computing net loss per share, basic and diluted 115,218 104,618 28,308 Net loss per share, basic and diluted $ (0.52 ) $ (0.08 ) $ (2.24 ) The potential common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented are as follows (in thousands): Years Ended December 31, 2019 2018 2017 Equity awards to purchase common stock 15,668 20,057 26,608 Unvested shares of common stock issued upon early exercise of stock options and business acquisition 31 70 57 Warrants to purchase common stock — — 184 Total 15,699 20,127 26,849

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information	17. SEGMENT INFORMATION An operating segment is defined as a component of an entity for which discrete financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) for purposes of allocating resources and evaluating financial performance. The Company uses the management approach to determine the segment financial information that should be disaggregated and presented separately in the Company’s notes to its consolidated financial statements. The management approach is based on the manner by which management has organized the segments within the Company for making operating decisions, allocating resources, and assessing performance. The Company reports its financial results consistent with the manner in which financial information is viewed by management for decision-making purposes. The Company does not manage operating expenses such as research and development, sales and marketing and general and administrative expenses at the segment level. The Company’s CODM is its Chief Executive Officer, and the CODM evaluates performance and makes decisions about allocating resources to its operating segments based on financial information presented on a consolidated basis and on revenue and gross profit for each operating segment. In the second quarter of 2017 the Company changed the operating segments to combine one of the previous operating segments with two existing segments to reflect how the CODM evaluates performance and allocates resources. This change did not result in a change to the reportable segments. The Company is organized into two reportable segments as follows: Platform Consists primarily of fees received from advertisers and content publishers, and from licensing the Company’s technology and proprietary operating system to service operators. Platform revenue primarily includes fees earned from the sale of digital advertising and revenue share from new or recurring user subscriptions activated through the Company’s platform and revenue share from user purchases of content publishers’ media through its platform. The Company also earns revenue from the sale of branded channel buttons on player and TV remote controls. Player Consists primarily of net sales of streaming media players, audio products and accessories through retailers and distributors, as well as directly to customers through the Company’s website. The Company does not allocate property and equipment or any other assets or capital expenditures to reportable segments. Operating expenses are not managed at the segment level. The Company evaluates the performance of its reportable segments based on the financial measures, including segment gross profit, which are regularly reviewed by the CODM and provide insight into the individual segments and their ability to contribute to Company’s operating results. Customers accounting for 10% or more of segment revenue, net, were as follows: Years Ended December 31, 2019 2018 2017 Platform segment revenue Customer E * * 13 % Player segment revenue Customer A 16 % 15 % 15 % Customer B 17 % 15 % 12 % Customer C 39 % 38 % 34 % Revenue in international markets was less than 10% in each of the periods presented. Substantially all Company assets were held in the United States and were attributable to the operations in the United States as of December 31, 2019 and 2018.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	18. QUARTERLY FINANCIAL DATA (Unaudited) The following table summarizes the Company’s information on total revenue, gross profit, net income (loss) and earnings per share by quarter for the years ended December 31, 2019 and 2018. This data was derived from the Company’s unaudited consolidated financial statements (in thousands, except per share data): Three Months Ended Dec 31, 2019 Sep 30, 2019 Jun 30, 2019 Mar 31, 2019 Total Revenue $ 411,230 $ 260,928 $ 250,101 $ 206,662 Gross Profit 161,647 118,477 114,209 100,891 Net loss attributable to common stockholders (15,717 ) (25,155 ) (9,333 ) (9,732 ) Basic and diluted net loss per share attributable to common stockholders (0.13 ) (0.22 ) (0.08 ) (0.09 ) Three Months Ended Dec 31, 2018 Sep 30, 2018 Jun 30, 2018 Mar 31, 2018 Total Revenue $ 275,739 $ 173,381 $ 156,810 $ 136,576 Gross Profit 112,291 78,993 77,752 63,112 Net income (loss) attributable to common stockholders 6,778 (9,527 ) 526 (6,634 ) Basic net income (loss) per share attributable to common stockholders 0.06 (0.09 ) 0.01 (0.07 ) Diluted net income (loss) per share attributable to common stockholders 0.05 (0.09 ) 0.00 (0.07 )

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The consolidated financial statements, which include the accounts of Roku, Inc. and its wholly-owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). All intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the Company’s consolidated financial statements in accordance with U.S. GAAP requires management to make certain estimates, judgements, and assumptions that affect the reported amounts of assets, liabilities, net revenue and expenses. Significant items subject to such estimates and assumptions include: for revenue recognition, determining the nature and timing of satisfaction of performance obligations, variable consideration, determining the stand-alone selling prices of performance obligations, gross versus net revenue recognition, evaluation of customer versus vendor relationships, and other obligations such as sales return reserves and customer incentive programs; the fair value or impairment of goodwill and intangible assets; useful lives of tangible and intangible assets; allowances for doubtful accounts; the valuation of inventory, the valuation of deferred income tax assets; the recognition and disclosure of contingent liabilities and stock-based compensation. The Company bases its estimates on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results may differ from the Company’s estimates and assumptions.
Comprehensive Loss	Comprehensive Loss Comprehensive loss includes unrealized gains on the Company’s short-term investments and foreign currency translation adjustments for the year ended December 31, 2019. Comprehensive loss includes unrealized losses on the Company’s short-term investments for the year ended December 31, 2018. During the year ended December 31, 2017, the Company had no short-term investments, and, as a result, comprehensive loss was equal to the net loss for the year ended December 31, 2017.
Foreign Currency	Foreign Currency The functional currency of most of the Company’s foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities of these subsidiaries are remeasured into U.S. dollars from the local currency at rates in effect at period-end and nonmonetary assets and liabilities are remeasured at historical rates. Revenues and expenses are remeasured at average exchange rates in effect during each period. Foreign currency gains or losses from re-measurement and transaction gains or losses are recorded as other income (expense), net in the consolidated statements of operations. During the years ended December 31, 2019 and 2018, the Company recorded a foreign currency loss of $0.2 million and $0.5 million, respectively. During the year ended December 31, 2017, the Company recorded a foreign currency gain of $0.1 million. The functional currency for one of the Company’s foreign subsidiaries is its local currency. The Company translates the assets and liabilities of its non-U.S. dollar functional currency subsidiary into U.S. dollars using exchange rates in effect at the end of each reporting period. Revenues and expenses are translated using rates that approximate those in effect during the period. Gains and losses from these translations are recognized as cumulative translation adjustment and included in accumulated other comprehensive loss in stockholder’s equity.
Concentrations	Concentrations Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of cash, cash equivalents, short-term investments and accounts receivable. As of December 31, 2019, two Accounts receivable are typically unsecured and are derived from revenue earned from customers. They are stated at invoice value less estimated allowances for returns, customer incentives and doubtful accounts. The Company performs ongoing credit evaluations of its customers and maintains allowances for potential credit losses. Customers accounting for 10% or more of the Company’s net revenue were as follows: Years Ended December 31, 2019 2018 2017 Customer B * * 10 % Customer C 14 % 18 % 20 % Customer E * * 10 % Customers accounting for 10% or more of the Company’s accounts receivable were as follows: As of December 31, 2019 2018 Customer D * 11 %
Business Combinations	Business Combinations The Company determines whether a transaction meets the definition of a business combination before applying the acquisition method of accounting to that transaction. The Company allocates the fair value of the purchase consideration of its acquisitions to the tangible and intangible assets acquired and liabilities assumed, based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of identifiable assets and liabilities is recorded as goodwill. The operating results of acquired business is included in the Company’s consolidated statement of operations beginning on their effective acquisition date. Acquisition-related expenses and certain acquisition restructuring and other related charges are recognized separately from the business combination and are expensed as incurred. Contingent consideration arrangements are recognized at fair value as of the acquisition date with subsequent fair value adjustments recorded in operations. Additional information regarding the Company's contingent consideration arrangement is included in Note 4, Business Combinations. While the Company uses its best estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date, estimates are inherently uncertain and subject to refinement. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially recorded in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to our consolidated statements of operations.
Intangible Assets	Intangible Assets Purchased intangible assets are carried at cost, net of accumulated amortization. Intangible assets are amortized primarily using the straight-line method over their estimated useful lives. The Company evaluates the estimated remaining useful lives of its intangible assets annually and when events or changes in circumstances warrant a revision to the remaining periods of amortization.
Impairment Assessment	Impairment Assessment The Company evaluates goodwill for possible impairment at least annually during the fourth quarter of each fiscal year or more often, if and when circumstances indicate that goodwill may be impaired. This includes but is not limited to significant adverse changes in the business climate, market conditions, or other events that indicate that it is more likely than not that the fair value of a reporting unit is less than its carrying value. In performing its annual goodwill assessment, the Company first performs a qualitative test and if necessary, then performs a quantitative test. To conduct the quantitative impairment test of goodwill, the Company compares the fair value of a reporting unit to its carrying value. The Company estimates the fair values of its reporting unit using discounted cash flow models or other valuation models, such as comparative transactions and market multiples. If the reporting unit’s carrying value exceeds its fair value, the Company records an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value. The Company reviews long-lived assets and intangible assets with finite lives for impairment at least annually or more often when events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable or that the useful lives of those assets are no longer appropriate. If impairment is indicated, the Company writes down the asset to its estimated fair value. The Company did not recognize any impairment for goodwill and intangible assets in any periods. The Company recorded $0.9 million in impairment to operating right-of-use assets during the year ended December 31, 2019 and $0.4 million in impairment to property and equipment during the year ended December 31, 2018 for assets that are no longer in use. The Company did not record any impairment during the year ended December 31, 2017.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company applies fair value accounting for all assets and liabilities that are recognized or disclosed at fair value in the consolidated financial statements. The carrying amounts reported in the consolidated financial statements for cash and cash equivalents, short-term investments, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to their short-term nature. The carrying amount of debt approximates fair value due to its variable interest rates.
Short-Term Investments	Short-Term Investments The Company considers investments in highly liquid instruments purchased with an original maturity of 90 days or less to be cash equivalents. The Company’s short-term investments consist of corporate bonds, commercial paper and U.S. Government agency securities. These investments are held in the custody of one major financial institution. As of December 31, 2019, the Company did not own any short-term investments. As of December 31, 2018, the short-term investments were classified as available-for-sale and were recorded at fair value in the consolidated balance sheet with net unrealized gains or losses reported as a separate component of accumulated other comprehensive income (loss), net of tax. The Company recognizes an impairment charge if a decline in the fair value of its investments is considered to be other-than-temporary. The Company has determined that gross unrealized losses on short-term investments at December 31, 2018 were temporary in nature because each investment meets the Company’s credit quality requirements and the Company has the ability and intent to hold these investments until they recover their unrealized losses.
Inventories	Inventories The Company’s inventories consist primarily of finished goods and are stated at the lower of cost or net realizable value with cost determined on a first-in, first-out basis. Provisions are made if the cost of the inventories exceeds their net realizable value. The Company evaluates inventory levels and purchase commitments for excess and obsolete products, based on management’s assessment of future demand and market conditions.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives of the assets, generally ranging between eighteen months and five years Capitalized costs are amortized using the straight-line method over the estimated useful life of the asset, which is generally two years, beginning when the asset is ready for its intended use. During the years ended December 31, 2019, 2018 and 2017, the Company amortized expenses of $1.6 million, $2.0 million and $1.1 million, respectively.
Content Licensing Fees	Content Licensing Fees The Company licenses content for viewing on The Roku Channel. The licensing arrangements can be for a fixed fee and/or advertising revenue share with specific windows of availability. The Company capitalizes the content fees and records a corresponding liability at the gross amount of the liability when the license period begins, the cost of the content is known, and the content is accepted and available for streaming. The Company amortizes licensed content assets into “Cost of Revenue, Platform” over the contractual window of availability . As of December 31, 2019, content related expenses that met these requirements were $1.7 million. As of December 31, 2018, .
Deferred Revenue	Deferred Revenue The Company’s deferred revenue reflects fees received from licensing and service arrangements, including advertising, that will be recognized as revenue over time or as services are rendered. Deferred revenue balances consist of the amount of player sales allocated to unspecified upgrades or enhancements on a when-and-if available basis, licensing and services fees from service operators and TV brands, and payments from advertisers and content publishers. Deferred revenue expected to be realized within one year is classified as current liabilities and the remaining is recorded as noncurrent liabilities.
Advertising Costs	Advertising Costs Advertising costs are expensed when incurred and are included in sales and marketing expense in the consolidated statements of operations. The Company incurred advertising costs of $7.3 million, $3.0 million and $3.4 million for the years December 31, 2019, 2018 and 2017, respectively.
Stock-Based Compensation	Stock-Based Compensation The Company measures compensation expense for all stock-based awards, including restricted stock units and stock options granted to employees, based on the estimated fair value of the award on the date of grant. For restricted stock units, the grant date fair value is based on the closing market price of the Company’s Class A common stock on the date of grant. The fair value of each stock option is estimated using the Black-Scholes option-pricing model. The Company accounts for forfeitures as they occur. Stock-based compensation is recognized on a straight-line basis over the requisite vesting period.
Income Taxes	Income Taxes The Company accounts for income taxes using an asset and liability approach. Deferred tax assets and liabilities are determined based on the difference between the consolidated financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts that are more likely than not to be realized.
Net Loss per Share	Net Loss per Share Since the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods as the inclusion of all potential common shares outstanding and potentially dilutive securities would have been anti-dilutive.
Adoption of New Accounting Standards and Recently Issued Accounting Pronouncements Not Yet Adopted	Adoption of New Accounting Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02, Leases (Topic 842) (“ASC 842”) , On January 1, 2019, the Company adopted the guidance in ASC 842 using the optional transition method and recorded right-of-use (“ROU”) assets and lease liabilities on its consolidated balance sheet. As a result, periods prior to 2019 were not adjusted. On the adoption date, the Company recognized ROU assets totaling $39.9 million, lease liabilities totaling $42.1 million and reclassification of deferred and prepaid rents of $2.2 million to ROU assets on its consolidated balance sheet. There was Recently Issued Accounting Pronouncements Not Yet Adopted In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Topic 350), Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract In August 2018, the FASB issued ASU 2018-13, Fair Value Measurements (Topic 820), Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
Fair Value Disclosure	The Company’s financial assets measured at fair value are as follows (in thousands): As of December 31, 2019 As of December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 463,820 $ 463,820 $ — $ 147,221 $ 147,221 $ — Money market funds 51,659 51,659 — 8,343 8,343 — Restricted cash 1,854 1,854 — — — — Short-term investments: Corporate bonds and commercial paper — — — 37,151 — 37,151 U.S. government securities — — — 4,995 — 4,995 Total assets measured and recorded at fair value $ 517,333 $ 517,333 $ — $ 197,710 $ 155,564 $ 42,146 Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal market (or most advantageous market, in the absence of a principal market) for the asset or liability in an orderly transaction between market participants at the measurement date. Further, the Company maximizes the use of observable inputs and minimizes the use of unobservable inputs in measuring fair value, and to utilize a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. The three levels of inputs used to measure fair value are as follows: Level 1 —Quoted prices in active markets for identical assets or liabilities. Financial assets and liabilities measured using Level 1 inputs include cash equivalents, accounts receivable, prepaid expenses, accounts payable and accrued liabilities. The Company considers all highly liquid investments purchased with an original or remaining maturity of 90 days or less at the date of purchase to be cash equivalents. The Company measured money market funds of $51.7 million and $8.3 million as cash equivalents as of December 31, 2019 and 2018, respectively, using Level 1 inputs. Level 2 —Observable inputs other than quoted prices included within Level 1, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; and inputs other than quoted prices that are observable or are derived principally from, or corroborated by, observable market data by correlation or other means. The Company measured its short-term investments using Level 2 inputs. Level 3 —Unobservable inputs that are supported by little or no market activity, are significant to the fair value of the assets or liabilities and reflect the Company’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The Company did not have Level 3 instruments at December 31, 2019 and 2018. During the year ended December 31, 2017, Level 3 instruments consisted of the Company’s convertible preferred stock warrant liability. Pursuant to the Company’s IPO in October 2017, all convertible preferred stock warrants were converted into Class B common stock warrants, which did not require further re-measurements as they were deemed permanent equity. For periods prior to the IPO, the Company’s convertible preferred stock warrant liability was measured at fair value upon issuance and at each reporting date prior to the IPO. The inputs that were used to determine the estimated fair value of the convertible preferred stock warrant liability included the remaining contractual term of the warrants, the risk-free interest rate, the volatility of comparable public companies over the remaining term, and the fair value of underlying shares. The significant unobservable inputs used in the fair value measurement of the convertible preferred stock warrant liability were the fair value of the underlying stock at the valuation date and the estimated term of the warrants. The following table represents the activity of Level 3 instruments (in thousands): Year Ended December 31, 2017 Convertible preferred stock warrant liability — beginning balance $ 9,990 Fair value of new warrants issued 2,032 Change in fair value of preferred stock warrant liability* 40,333 Reclassification to additional paid in capital upon conversion to common warrants (52,355 ) Convertible preferred stock warrant liability — ending balance $ — * Recognized in the consolidated statements of operations within other income (expense), net. Assets and liabilities that are measured at fair value on a non-recurring basis Non-financial assets such as goodwill, intangible assets, property, plant, and equipment and operating lease right-of-use assets are evaluated for impairment and adjusted to fair value using Level 3 inputs, only when impairment is recognized. The Company recorded an impairment of $0.9 million for operating lease right-of-use assets and $0.4 million for long-lived assets that were no longer in use during the years ended December 31, 2019 and 2018, respectively. There were no indicators of impairment that required a fair value analysis during the year ended December 31, 2017.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Net Revenue
Schedules of Customer Concentration by Risk Factor	Customers accounting for 10% or more of the Company’s net revenue were as follows: Years Ended December 31, 2019 2018 2017 Customer B * * 10 % Customer C 14 % 18 % 20 % Customer E * * 10 %
Accounts Receivable
Schedules of Customer Concentration by Risk Factor	Customers accounting for 10% or more of the Company’s accounts receivable were as follows: As of December 31, 2019 2018 Customer D * 11 %

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Schedule of Contract Balances	Contract balances include the following (in thousands): As of December 31, 2019 2018 Accounts receivable, net $ 332,673 $ 183,078 Contract assets (included in Prepaid expenses and other current assets) 3,588 753 Deferred revenue, current portion 39,861 45,442 Deferred revenue, non-current portion 15,370 19,594 Total deferred revenue $ 55,231 $ 65,036

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Schedule of Preliminary Allocation of Purchase Consideration to Tangible and Intangible Assets Acquired and Liabilities Assumed	The preliminary allocation of the purchase consideration to tangible and intangible assets acquired and liabilities assumed is based on estimated fair values and is as follows (in thousands): Assets acquired Current assets $ 50,829 Restricted cash 1,303 Property and equipment, net 4,503 Intangible assets 70,200 Goodwill 72,733 Operating lease right-of-use assets 24,658 Other long-term assets 235 Total assets acquired 224,461 Liabilities assumed Current liabilities (51,428 ) Operating lease liabilities (24,658 ) Total liabilities assumed (76,086 ) Total preliminary purchase consideration $ 148,375
Summary of Valuation of Intangible Assets Acquired	The fair value of the intangible assets has been estimated using the income approach in which the after-tax cash flows are discounted to present value. The key valuation assumptions include the Company's estimates of revenue growth projections and discount rates. The valuation of the intangible assets acquired from dataxu along with their estimated useful lives, is as follows (in thousands): Estimated Fair Value Estimated Useful Lives (in years) Developed technology $ 56,400 6.0 Customer relationships 13,400 4.0 Tradename 400 0.5 Estimated fair value of acquired intangible assets $ 70,200
Schedule of Unaudited Pro Forma Financial Information	The unaudited pro forma financial information was as follows (in thousands): For the Year Ended December 31, 2019 2018 Total Revenues $ 1,218,403 $ 884,286 Pretax loss (87,654 ) (39,919 ) Net loss (86,791 ) (39,670 )

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following table is the summary of Company’s intangible assets (in thousands): As of December 31, 2019 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted-Average Useful Lives (in years) Developed technology $ 62,367 $ (2,860 ) $ 59,507 5.9 Customer relationships 13,400 (558 ) 12,842 4.0 Tradename 400 (133 ) 267 0.5 Patents 4,076 (24 ) 4,052 14.0 Intangible assets $ 80,243 $ (3,575 ) $ 76,668 As of December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted-Average Useful Lives (in years) Developed technology $ 2,215 $ (738 ) $ 1,477 4.0 Intangible assets $ 2,215 $ (738 ) $ 1,477
Schedule of Estimated Future Amortization Expense for Intangible Asset	The estimated future amortization expense for intangible asset for the next five years and thereafter is as follows (in thousands): Year Ending December 31, 2020 $ 14,487 2021 14,036 2022 13,666 2023 13,108 2024 10,316 Thereafter 11,055 Total $ 76,668

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Schedule of Accounts Receivable, Net	Accounts receivable, net consisted of the following (in thousands): As of December 31, 2019 2018 Gross accounts receivable $ 360,194 $ 204,975 Allowance for sales returns (6,550 ) (7,335 ) Allowance for sales incentives (19,476 ) (13,750 ) Other allowances (1,495 ) (812 ) Total allowances (27,521 ) (21,897 ) Total Accounts Receivable—net of allowances $ 332,673 $ 183,078
Schedule of Allowance for Sales Returns	Allowance for sales returns consist of the following activities (in thousands): As of December 31, 2019 2018 Beginning balance $ (7,335 ) $ (6,907 ) Charged to revenue (15,541 ) (17,396 ) Utilization of sales return reserve 16,326 16,968 Ending balance $ (6,550 ) $ (7,335 )
Schedule of Allowance for Sales Incentives	Allowance for sales incentive consisted of the following activities (in thousands): As of December 31, 2019 2018 Beginning balance $ (13,750 ) $ (10,442 ) Charged to revenue (65,676 ) (50,958 ) Utilization of sales incentive reserve 59,950 47,650 Ending balance $ (19,476 ) $ (13,750 )
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): As of December 31, 2019 2018 Computers and equipment $ 23,834 $ 16,056 Leasehold improvements 93,239 18,396 Website and internal-use software 6,510 6,423 Office equipment and furniture 12,091 4,069 Total property and equipment 135,674 44,944 Accumulated depreciation and amortization (32,412 ) (19,680 ) Property and Equipment, net $ 103,262 $ 25,264
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): As of December 31, 2019 2018 Payments due to content publishers $ 57,376 $ 32,463 Accrued cost of revenue 58,149 22,830 Operating lease liability, current 17,896 — Accrued royalty expense 18,040 7,939 Accrued payroll and related expenses 14,522 12,217 Accrued inventory 2,892 6,008 Marketing, retail and merchandising costs 7,624 — Accrued legal expenses 3,158 — Customer prepayments 2,669 3,124 Taxes and related liabilities 3,052 1,314 Other accrued expenses 12,969 6,091 Total Accrued Liabilities $ 198,347 $ 91,986
Schedule of Deferred Revenue	Deferred revenue consisted of the following (in thousands): As of December 31, 2019 2018 Platform, current $ 18,234 $ 28,569 Player, current 21,627 16,873 Total deferred revenue, current 39,861 45,442 Platform, non-current 6,135 12,783 Player, non-current 9,235 6,811 Total deferred revenue, non-current 15,370 19,594 Total Deferred Revenue $ 55,231 $ 65,036

Short-Term Investments (Tables)

Short-Term Investments (Tables)	12 Months Ended
	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Summary of Short-term Investments	The following is a summary of the Company’s short-term investments as of December 31, 2018 (in thousands): As of December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Corporate bonds and commercial paper $ 37,168 $ — $ (17 ) $ 37,151 U.S. government securities 4,995 — — $ 4,995 Total Short-Term Investments $ 42,163 $ — $ (17 ) $ 42,146
Summary of Maturities of Short-term Investments by Contractual Maturity	The following table summarizes the maturities of the Company’s short-term investments by contractual maturity (in thousands): As of December 31, 2018 Amortized Cost Fair Value Less than 1 year $ 42,163 $ 42,146 Due in 1-3 years — — Total Short-Term Investments $ 42,163 $ 42,146

Fair Value Disclosure (Tables)

Fair Value Disclosure (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Financial Assets Measured at Fair Value	The Company’s financial assets measured at fair value are as follows (in thousands): As of December 31, 2019 As of December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 463,820 $ 463,820 $ — $ 147,221 $ 147,221 $ — Money market funds 51,659 51,659 — 8,343 8,343 — Restricted cash 1,854 1,854 — — — — Short-term investments: Corporate bonds and commercial paper — — — 37,151 — 37,151 U.S. government securities — — — 4,995 — 4,995 Total assets measured and recorded at fair value $ 517,333 $ 517,333 $ — $ 197,710 $ 155,564 $ 42,146
Schedule of Level 3 Instruments	The following table represents the activity of Level 3 instruments (in thousands): Year Ended December 31, 2017 Convertible preferred stock warrant liability — beginning balance $ 9,990 Fair value of new warrants issued 2,032 Change in fair value of preferred stock warrant liability* 40,333 Reclassification to additional paid in capital upon conversion to common warrants (52,355 ) Convertible preferred stock warrant liability — ending balance $ — * Recognized in the consolidated statements of operations within other income (expense), net.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of Components of Lease Expense	The components of lease expense are as follows (in thousands): Year Ended December 31, 2019 Operating lease cost $ 30,218 Sublease income (2,622 ) Net operating lease cost $ 27,596
Schedule of Supplemental Cash Flow Information Related To Leases	Supplemental cash flow information related to leases is as follows (in thousands): Year Ended December 31, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 17,721 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 267,048
Schedule of Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows (in thousands, except lease term and discount rate): As of December 31, 2019 Operating lease right-of-use assets $ 283,291 Included in accounts payable and accrued liabilities: Operating lease liability, current 17,896 Operating lease liability, non-current 301,694 Total operating lease liability $ 319,590 Weighted Average Remaining Lease Term: Operating leases (in years) 9.98 Weighted Average Discount Rate: Operating leases 4.65 %
Schedule of Future Lease Payments under Operating Leases	Future lease payments under operating leases as of December 31, 2019 were as follows (in thousands): Year Ending December 31, Operating Leases 2020 $ 29,230 2021 47,035 2022 43,909 2023 44,655 2024 44,014 Thereafter 246,488 Total future lease payments 455,331 Less: imputed interest (95,762 ) Less: expected tenant improvement allowance (39,979 ) Total $ 319,590
Schedule of Future Minimum Lease Payments Due under Operating Leases	The following table summarizes the future minimum lease payments due under operating leases as of December 31, 2018 and reflect the application of the prior lease standard (ASC 840, Leases). These amounts were disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (in thousands): Year Ending December 31, Operating Leases 2019 $ 16,817 2020 29,124 2021 32,034 2022 32,844 2023 33,414 Thereafter 223,472 Less: sublease income (3,711 ) Total $ 363,994

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Outstanding Debt	The Company’s outstanding debt as of December 31, 2019 is as follows (in thousands): As of December 31, 2019 Amount Effective Interest Rate Term Loan A Facility $ 100,000 3.48 % Less: Debt issuance costs (392 ) Net carrying amount of debt $ 99,608
Schedule of Interest Expense Recognized in Relation to Debt	The following table sets forth the Company’s interest expense recognized in relation to the debt (in thousands): Year Ended December 31, 2019 Contractual interest expenses related to Term Loan A Facility $ 420 Amortization of debt issuance costs 11 Total interest expense $ 431

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2019
Schedule of Reserved Shares of Common Stock for Issuance	At December 31, 2019, the Company had reserved shares of common stock for issuance as follows (in thousands): As of December 31, 2019 Common stock awards granted under equity incentive plans 15,668 Common stock awards available for issuance under the 2017 Employee Stock Purchase Plan * 2,089 Common stock awards available for issuance under the 2017 Equity Incentive Plan 16,950 Total reserved shares of common stock 34,707
Summary of Restricted Stock Unit Activity	Restricted stock unit activity for the year ended December 31, 2019 is as follows (in thousands, except per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Balance, December 31, 2018 3,686 $ 48.50 Awarded 2,228 87.60 Released (822 ) 49.26 Forfeited (548 ) 50.40 Balance, December 31, 2019 - outstanding 4,544 $ 67.30
Schedule of Stock Option Activity	The following table summarizes the Company’s stock option activities under the 2008 Plan and 2017 Plan (in thousands, except per share data): Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Weighted Average Grant Date Fair Value Per Share Aggregate Intrinsic Value Balance, December 31, 2018 16,371 $ 8.59 6.8 — Granted 572 100.06 — $ 39.23 Exercised (5,352 ) 5.35 — — Forfeited and expired (467 ) 8.77 — — Balance, December 31, 2019 - outstanding 11,124 $ 14.84 6.2 — $ 1,324,461 Options exercisable at December 31, 2019 6,603 $ 5.84 5.1 — $ 845,590
Schedule of Share-based Compensation Expense Included in Consolidated Statements of Operations	The following table shows total stock-based compensation expense included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2019, 2018 and 2017 (in thousands): Years Ended December 31, 2019 2018 2017 Cost of platform revenue $ 342 $ 97 $ 81 Cost of player revenue 1,072 469 145 Research and development 40,036 18,538 4,714 Sales and marketing 24,179 10,459 2,817 General and administrative 19,546 8,111 3,196 Total stock-based compensation $ 85,175 $ 37,674 $ 10,953
Summary of Assumptions Used to Value Stock-Based Awards Granted	The assumptions used to value stock-based awards granted during the years ended December 31, 2019, 2018 and 2017 are as follows: Years Ended December 31, 2019 2018 2017 Dividend rate — — — Expected term (in years) 5.0 - 6.7 5.3 - 6.8 5.3 - 6.5 Risk-free interest rate 1.35 - 2.56% 2.32 - 2.88% 1.87 - 2.25% Expected volatility 35 - 36% 38 - 40% 39 - 44% Fair value of common stock — — $2.56 - $18.46
Convertible Preferred Stock Warrants
Summary of Assumptions Used to Value Stock-Based Awards Granted	The Company valued the convertible preferred stock warrants using the following assumptions: Year Ended December 31, 2017 Dividend rate — Expected term (in years) 3.0 - 9.7 Risk-free interest rate 1.5 - 2.3% Expected volatility 44 - 51%

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of Components of Loss Before Income Taxes	The components of loss before income taxes consist of the following (in thousands): Years Ended December 31, 2019 2018 2017 United States $ (63,453 ) $ (11,128 ) $ (63,831 ) Foreign 2,534 1,795 637 Net loss before income taxes $ (60,919 ) $ (9,333 ) $ (63,194 )
Schedule of Income Tax (Benefit) Expense	The income tax (benefit) expense consisted of the following (in thousands): Years Ended December 31, 2019 2018 2017 Current: Federal $ (47 ) $ — $ — State 244 114 89 Foreign 108 184 674 305 298 763 Deferred: Foreign (1,287 ) (774 ) (448 ) Total $ (982 ) $ (476 ) $ 315
Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate: Years Ended December 31, 2019 2018 2017 U.S. federal income tax at statutory rate 21.0 % 21.0 % 34.0 % U.S. state and local income taxes (0.4 ) (1.3 ) (0.2 ) Change in valuation allowance (213.4 ) (1,039.4 ) 19.0 Federal research and development tax credit 30.8 166.2 5.2 Convertible preferred stock warrants — — (21.7 ) Stock-based compensation 158.0 859.4 1.2 Meals and Entertainment (1.4 ) (6.6 ) (1.1 ) Permanent items — (1.1 ) — Foreign rate differential (0.6 ) (1.5 ) 0.2 Acquisition costs (1.3 ) — — Section 162(m) limitation (1.4 ) — — State apportionment change 1.3 — — Tax rate change (0.4 ) 2.4 (36.4 ) Provision to return true-up 9.9 5.9 — Other (0.5 ) 0.1 (0.7 ) Effective tax rate 1.6 % 5.1 % (0.5 )%
Summary of Significant Components of Deferred Income Tax Assets and Liabilities	Significant components of the Company’s deferred income tax assets and liabilities consist of the following (in thousands): As of December 31, 2019 2018 Deferred tax assets: Net operating loss carryforwards $ 263,512 $ 128,829 Reserves and accruals 10,425 7,840 Research and development credits 73,442 39,344 Lease Obligation 81,639 — Stock-based compensation 17,494 7,529 Total deferred tax assets 446,512 183,542 Deferred tax liabilities: Right-of-use asset (72,243 ) — Depreciation and amortization (10,916 ) (343 ) Total deferred tax liabilities (83,159 ) (343 ) Valuation allowance (361,233 ) (182,360 ) Net deferred tax assets $ 2,120 $ 839
Summary of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands): As of December 31, 2019 2018 Unrecognized tax benefits at beginning of year $ 14,541 $ 5,843 Gross increase for tax positions of current year 10,378 7,053 Gross decrease due to statue expiration (88 ) — Gross increase for tax positions of prior years — 1,645 Gross decrease for tax positions of prior years (5,344 ) — Unrecognized tax benefits balance at end of year $ 19,487 $ 14,541

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Summary of Calculation of Basic and Diluted Net Loss Per Share	The table presents the calculation of basic and diluted net loss per share as follows (in thousands, except per share data): Years Ended December 31, 2019 2018 2017 Numerator: Net loss allocable to common stockholders $ (59,937 ) $ (8,857 ) $ (63,509 ) Denominator: Weighted-average shares used in computing net loss per share, basic and diluted 115,218 104,618 28,308 Net loss per share, basic and diluted $ (0.52 ) $ (0.08 ) $ (2.24 )
Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss Per Share	The potential common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented are as follows (in thousands): Years Ended December 31, 2019 2018 2017 Equity awards to purchase common stock 15,668 20,057 26,608 Unvested shares of common stock issued upon early exercise of stock options and business acquisition 31 70 57 Warrants to purchase common stock — — 184 Total 15,699 20,127 26,849

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Schedule of Customer Accounting for 10% or More of Segment Revenue	Customers accounting for 10% or more of segment revenue, net, were as follows: Years Ended December 31, 2019 2018 2017 Platform segment revenue Customer E * * 13 % Player segment revenue Customer A 16 % 15 % 15 % Customer B 17 % 15 % 12 % Customer C 39 % 38 % 34 %

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Summary of the Company's Information on Total Revenue, Gross Profit, Net Income (Loss) and Earnings Per Share by Quarter	The following table summarizes the Company’s information on total revenue, gross profit, net income (loss) and earnings per share by quarter for the years ended December 31, 2019 and 2018. Three Months Ended Dec 31, 2019 Sep 30, 2019 Jun 30, 2019 Mar 31, 2019 Total Revenue $ 411,230 $ 260,928 $ 250,101 $ 206,662 Gross Profit 161,647 118,477 114,209 100,891 Net loss attributable to common stockholders (15,717 ) (25,155 ) (9,333 ) (9,732 ) Basic and diluted net loss per share attributable to common stockholders (0.13 ) (0.22 ) (0.08 ) (0.09 ) Three Months Ended Dec 31, 2018 Sep 30, 2018 Jun 30, 2018 Mar 31, 2018 Total Revenue $ 275,739 $ 173,381 $ 156,810 $ 136,576 Gross Profit 112,291 78,993 77,752 63,112 Net income (loss) attributable to common stockholders 6,778 (9,527 ) 526 (6,634 ) Basic net income (loss) per share attributable to common stockholders 0.06 (0.09 ) 0.01 (0.07 ) Diluted net income (loss) per share attributable to common stockholders 0.05 (0.09 ) 0.00 (0.07 )

The Company - Additional Inform

The Company - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions	Oct. 02, 2017USD ($)ClassesofStockVote$ / sharesshares	Dec. 31, 2019segment
Entity Wide Revenue Major Customer [Line Items]
Conversion date		Feb. 1, 2008
Number of reportable segments operates | segment		2
Number of classes of authorized common stock | ClassesofStock	2
Class A Common Stock
Entity Wide Revenue Major Customer [Line Items]
Number of votes per share | Vote	1
Class B Common Stock
Entity Wide Revenue Major Customer [Line Items]
Number of votes per share | Vote	10
Initial Public Offering | Class B Common Stock Warrants
Entity Wide Revenue Major Customer [Line Items]
Warrants conversion ratio	100.00%
Initial Public Offering | Class A Common Stock
Entity Wide Revenue Major Customer [Line Items]
Initial public offering completed date	Oct. 2, 2017
Number of shares sold | shares	10.4
Share sold price per share | $ / shares	$ 14
Net proceeds from shares sold | $	$ 134.8
Underwriting discounts and commissions | $	10.1
Offering costs incurred | $	$ 3.1
Initial Public Offering | Class B Common Stock
Entity Wide Revenue Major Customer [Line Items]
Convertible preferred stock, Shares converted | shares	80.8
Stock conversion ratio	100.00%
Over-Allotment Option | Class A Common Stock
Entity Wide Revenue Major Customer [Line Items]
Number of shares sold | shares	1.4

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details)	Jan. 01, 2019USD ($)	Dec. 31, 2019USD ($)FinancialInstitution	Dec. 31, 2018USD ($)FinancialInstitution	Dec. 31, 2017USD ($)
Summary Of Significant Accounting Policies [Line Items]
Unrealized loss on short-term investments		$ 17,000	$ (17,000)	$ 0
Foreign currency gains (loss)		(200,000)	(500,000)	100,000
Impairment of property and equipment			400,000	0
Impairment to operating right of use assets		900,000
Short-term investments		0	42,146,000
Content related expenses		1,700,000
Advertising costs		7,300,000	$ 3,000,000	3,400,000
Operating lease right-of-use assets	$ 39,900,000	283,291,000
Operating lease liability	42,100,000	$ 319,590,000
Reclassification of deferred and prepaid rents to right of use assets	$ 2,200,000
Maximum
Summary Of Significant Accounting Policies [Line Items]
Business combination measurement period from acquisition		1 year
Cash equivalents maturity period		90 days
Property and equipment, estimated useful lives		5 years
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		18 months
Customer 1
Summary Of Significant Accounting Policies [Line Items]
Number of financial institutions which manage cash balances | FinancialInstitution		1	1
Customer 2
Summary Of Significant Accounting Policies [Line Items]
Number of financial institutions which manage cash balances | FinancialInstitution		1
Cash, Cash Equivalents and Short-term Investment | Customer 1
Summary Of Significant Accounting Policies [Line Items]
Percentage of cash, cash equivalents balances		65.00%	97.00%
Cash, Cash Equivalents and Short-term Investment | Customer 2
Summary Of Significant Accounting Policies [Line Items]
Percentage of cash, cash equivalents balances		34.00%
Website and Internal-Use Software
Summary Of Significant Accounting Policies [Line Items]
Capitalized costs		$ 100,000	$ 1,000,000	2,600,000
Amortized expenses		$ 1,600,000	$ 2,000,000	$ 1,100,000
Estimated useful life		2 years
Leasehold Improvements
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives description		shorter of the lease term or their estimated useful lives, which range from five to ten years
Leasehold Improvements | Maximum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		10 years
Leasehold Improvements | Minimum
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		5 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedules of Customer Concentration by Risk Factor (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk			10.00%
Net Revenue | Customer C
Concentration Risk [Line Items]
Concentration risk	14.00%	18.00%	20.00%
Net Revenue | Customer E
Concentration Risk [Line Items]
Concentration risk			10.00%
Accounts Receivable | Customer D
Concentration Risk [Line Items]
Concentration risk		11.00%

Revenue - Additional Informatio

Revenue - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019USD ($)segment	Dec. 31, 2018USD ($)
Revenue From Contract With Customer [Abstract]
Contract acquisition cost recognition, description	most direct contract acquisition costs relate to contracts that are recognized over a period of one year or less.
Contract acquisition, capitalized cost	$ 0
Number of reportable segment | segment	2
Contract with customer assets increase (decrease)	$ 2,800,000	$ (3,400,000)
Increase (decrease) in deferred revenue	(9,800,000)	10,100,000
Deferred revenue increase decrease due to revenue recognized upon customer acceptance	5,000,000
Deferred revenue recognized	52,500,000	$ 38,500,000
Estimated contracted revenue	$ 161,100,000
Revenue, remaining performance obligation, expected timing of satisfaction, Description	Revenue allocated to remaining performance obligations represents estimated contracted revenue that has not yet been recognized which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods. Estimated contracted revenue was $161.1 million as of December 31, 2019 of which the Company expects to recognize approximately 54% over the next 12 months and the remainder thereafter.
Revenue remaining performance obligation percentage of revenue expected to be recognized	54.00%

Revenue - Schedule of Contract

Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Contract Balances [Line Items]
Accounts receivable, net	$ 332,673	$ 183,078
Deferred revenue, current portion	39,861	45,442
Deferred revenue, non-current portion	15,370	19,594
Total deferred revenue	55,231	65,036
Prepaid Expenses and Other Current Assets
Schedule Of Contract Balances [Line Items]
Contract assets (included in Prepaid expenses and other current assets)	$ 3,588	$ 753

Business Combination - Addition

Business Combination - Additional Information (Details) - Boston-based Dataxu, Inc, Demand-Side Platform (DSP) - USD ($) shares in Thousands, $ in Millions	Nov. 08, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Business combination, date of merger agreement	Oct. 22, 2019
Purchase consideration	$ 148.4
Business combination, aggregate cash consideration	78.7
Business combination, aggregate fair value	69.7
Amount deposited to escrow account	18.8
Purchase consideration included in escrow deposit	17.5
Business combination, contingent consideration	$ 1.8
Business combination, pro forma information, revenue		$ 16.8
Business combination, pro forma information, cost of revenue		10.2
Business combination, pro forma information, gross profit		$ 6.6
Maximum
Business Acquisition [Line Items]
Measurement period	1 year
Identifiable intangible assets, estimated useful lives	6 years
Minimum
Business Acquisition [Line Items]
Identifiable intangible assets, estimated useful lives	6 months
General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition related cost	$ 3.9
Common Stock
Business Acquisition [Line Items]
Shares of common stock issued	571,459

Business Combination - Schedule

Business Combination - Schedule of Preliminary Allocation of Purchase Consideration to Tangible and Intangible Assets Acquired and Liabilities Assumed (Details) - USD ($)	Dec. 31, 2019	Nov. 08, 2019	Dec. 31, 2018
Assets acquired
Goodwill	$ 74,116,000		$ 1,382,000
Boston-based Dataxu, Inc, Demand-Side Platform (DSP)
Assets acquired
Current assets		$ 50,829,000
Restricted cash		1,303,000
Property and equipment, net		4,503,000
Intangible assets		70,200,000
Goodwill	$ 72,700	72,733,000
Operating lease right-of-use assets		24,658,000
Other long-term assets		235,000
Total assets acquired		224,461,000
Liabilities assumed
Current liabilities		(51,428,000)
Operating lease liabilities		(24,658,000)
Total liabilities assumed		(76,086,000)
Total preliminary purchase consideration		$ 148,375,000

Business Combination - Summary

Business Combination - Summary of Valuation of Intangible Assets Acquired (Details) - Boston-based Dataxu, Inc, Demand-Side Platform (DSP) $ in Thousands	Nov. 08, 2019USD ($)
Finite Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 70,200
Developed Technology
Finite Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 56,400
Estimated Useful Lives (in years)	6 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 13,400
Estimated Useful Lives (in years)	4 years
Tradename
Finite Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 400
Estimated Useful Lives (in years)	6 months

Business Combination - Schedu_2

Business Combination - Schedule of Unaudited Pro Forma Financial Information (Details) - Boston-based Dataxu, Inc, Demand-Side Platform (DSP) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Total Revenues	$ 1,218,403	$ 884,286
Pretax loss	(87,654)	(39,919)
Net loss	$ (86,791)	$ (39,670)

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 08, 2019
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 74,116,000	$ 1,382,000
Boston-based Dataxu, Inc, Demand-Side Platform (DSP)
Finite Lived Intangible Assets [Line Items]
Goodwill	72,700			$ 72,733,000
Goodwill impairment loss	0	0	$ 0
Amortization of intangible assets	2,800,000	$ 600,000	$ 200,000
Boston-based Dataxu, Inc, Demand-Side Platform (DSP) | Developed Technology, Customer Relationships, and Tradename
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets	70,200,000
Boston-based Dataxu, Inc, Demand-Side Platform (DSP) | Patents
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets	4,100,000
Boston-based Dataxu, Inc, Demand-Side Platform (DSP) | Developed Technology
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 3,800,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 80,243	$ 2,215
Accumulated Amortization	(3,575)	(738)
Net Carrying Amount	76,668	1,477
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	62,367	2,215
Accumulated Amortization	(2,860)	(738)
Net Carrying Amount	$ 59,507	$ 1,477
Identifiable intangible assets, estimated useful lives	5 years 10 months 24 days	4 years
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 13,400
Accumulated Amortization	(558)
Net Carrying Amount	$ 12,842
Identifiable intangible assets, estimated useful lives	4 years
Tradename
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 400
Accumulated Amortization	(133)
Net Carrying Amount	$ 267
Identifiable intangible assets, estimated useful lives	6 months
Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,076
Accumulated Amortization	(24)
Net Carrying Amount	$ 4,052
Identifiable intangible assets, estimated useful lives	14 years

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense for Intangible Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2020	$ 14,487
2021	14,036
2022	13,666
2023	13,108
2024	10,316
Thereafter	11,055
Net Carrying Amount	$ 76,668	$ 1,477

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]
Gross accounts receivable	$ 360,194	$ 204,975
Allowance for accounts receivable	(27,521)	(21,897)
Total Accounts Receivable—net of allowances	332,673	183,078
Allowance for Sales Returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	(6,550)	(7,335)	$ (6,907)
Allowance for Sales Incentives
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	(19,476)	(13,750)	$ (10,442)
Other Allowances
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	$ (1,495)	$ (812)

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Allowance for Sales Returns (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (21,897)
Ending balance	(27,521)	$ (21,897)
Allowance for Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	(7,335)	(6,907)
Charged to revenue	(15,541)	(17,396)
Utilization of sales return/incentive reserve	16,326	16,968
Ending balance	$ (6,550)	$ (7,335)

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Allowance for Sales Incentives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (21,897)
Ending balance	(27,521)	$ (21,897)
Allowance for Sales Incentives
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	(13,750)	(10,442)
Charged to revenue	(65,676)	(50,958)
Utilization of sales return/incentive reserve	59,950	47,650
Ending balance	$ (19,476)	$ (13,750)

Balance Sheet Components - Sc_4

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 135,674	$ 44,944
Accumulated depreciation and amortization	(32,412)	(19,680)
Property and Equipment, net	103,262	25,264
Computer and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	23,834	16,056
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	93,239	18,396
Website and Internal-Use Software
Property Plant And Equipment [Line Items]
Total property and equipment	6,510	6,423
Office Equipment and Furniture
Property Plant And Equipment [Line Items]
Total property and equipment	$ 12,091	$ 4,069

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Depreciation and amortization	$ 12.8	$ 7.8	$ 5.2

Balance Sheet Components - Sc_5

Balance Sheet Components - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities Current [Abstract]
Payments due to content publishers	$ 57,376	$ 32,463
Accrued cost of revenue	58,149	22,830
Operating lease liability, current	17,896
Accrued royalty expense	18,040	7,939
Accrued payroll and related expenses	14,522	12,217
Accrued inventory	2,892	6,008
Marketing, retail and merchandising costs	7,624
Accrued legal expenses	3,158
Customer prepayments	2,669	3,124
Taxes and related liabilities	3,052	1,314
Other accrued expenses	12,969	6,091
Total Accrued Liabilities	$ 198,347	$ 91,986

Balance Sheet Components - Sc_6

Balance Sheet Components - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	$ 39,861	$ 45,442
Deferred revenue, non-current	15,370	19,594
Total deferred revenue	55,231	65,036
Player
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	21,627	16,873
Deferred revenue, non-current	9,235	6,811
Platform
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	18,234	28,569
Deferred revenue, non-current	$ 6,135	$ 12,783

Short-Term Investments - Additi

Short-Term Investments - Additional Information (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Short-term investments	$ 0	$ 42,146,000

Short-Term Investments - Summar

Short-Term Investments - Summary of Short-term Investments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 42,163
Gross Unrealized Loss	(17)
Fair Value	42,146
Corporate Bonds and Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	37,168
Gross Unrealized Loss	(17)
Fair Value	37,151
U.S. Government Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,995
Fair Value	$ 4,995

Short-Term Investments - Summ_2

Short-Term Investments - Summary of Maturities of Short-term Investments by Contractual Maturity (Details) $ in Thousands	Dec. 31, 2018USD ($)
Investments Debt And Equity Securities [Abstract]
Less than 1 year, amortized cost	$ 42,163
Amortized Cost	42,163
Less than 1 year, fair value	42,146
Total short-term investments, fair value	$ 42,146

Fair Value Disclosure - Schedul

Fair Value Disclosure - Schedule of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Restricted cash	$ 1,854
Fair Value		$ 42,146
Total assets measured and recorded at fair value	517,333	197,710
Level 1
Assets:
Restricted cash	1,854
Total assets measured and recorded at fair value	517,333	155,564
Level 2
Assets:
Total assets measured and recorded at fair value		42,146
Cash
Assets:
Cash and cash equivalents	463,820	147,221
Cash | Level 1
Assets:
Cash and cash equivalents	463,820	147,221
Money Market Fund
Assets:
Cash and cash equivalents	51,659	8,343
Money Market Fund | Level 1
Assets:
Cash and cash equivalents	$ 51,659	8,343
Corporate Bonds and Commercial Paper
Assets:
Fair Value		37,151
Corporate Bonds and Commercial Paper | Level 2
Assets:
Fair Value		37,151
U.S. Government Securities
Assets:
Fair Value		4,995
U.S. Government Securities | Level 2
Assets:
Fair Value		$ 4,995

Fair Value Disclosure - Additio

Fair Value Disclosure - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of operating lease right of use assets	$ 900,000
Impairment of long-lived assets		$ 400,000	$ 0
Money Market Fund | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 51,700,000	$ 8,300,000

Fair Value Disclosure - Sched_2

Fair Value Disclosure - Schedule of Level 3 Instruments (Details) - Convertible Preferred Stock Warrant Liability $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Convertible preferred stock warrant liability — beginning balance	$ 9,990
Fair value of new warrants issued	2,032
Change in fair value of preferred stock warrant liability	40,333	[1]
Reclassification to additional paid in capital upon conversion to common warrants	$ (52,355)
[1]	Recognized in the consolidated statements of operations within other income (expense), net.

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases [Line Items]
Lessee, operating lease, existence of option to extend	true
Lessee, operating lease, existence of option to terminate	true
Sub lease expiration year	2020
Additional leases, primarily for corporate offices, that have not yet commenced	$ 6.6
Rent expense		$ 9.7	$ 6.9
Minimum
Leases [Line Items]
Remaining lease term, operating lease	1 year
Additional operating leases that have not yet commenced, lease terms	5 years
Maximum
Leases [Line Items]
Remaining lease term, operating lease	11 years
Additional operating leases that have not yet commenced, lease terms	11 years

Leases - Schedule of Components

Leases - Schedule of Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 30,218
Sublease income	(2,622)
Net operating lease cost	$ 27,596

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 17,721
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 267,048

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 283,291	$ 39,900
Operating lease liability, current	17,896
Operating lease liability, non-current	301,694
Total operating lease liability	$ 319,590	$ 42,100
Weighted Average Remaining Lease Term:
Operating leases (in years)	9 years 11 months 23 days
Weighted Average Discount Rate:
Operating leases	4.65%

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Payments under Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 29,230
2021	47,035
2022	43,909
2023	44,655
2024	44,014
Thereafter	246,488
Total future lease payments	455,331
Less: imputed interest	(95,762)
Less: expected tenant improvement allowance	(39,979)
Total	$ 319,590	$ 42,100

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments Due under Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2019	$ 16,817
2020	29,124
2021	32,034
2022	32,844
2023	33,414
Thereafter	223,472
Less: sublease income	(3,711)
Total	$ 363,994

Debt - Schedule of Outstanding

Debt - Schedule of Outstanding Debt (Details) $ in Thousands	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Less: Debt issuance costs	$ (392)
Net carrying amount of debt	99,608
Term Loan A Facility
Debt Instrument [Line Items]
Term Loan A Facility	$ 100,000
Effective Interest Rate	3.48%

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Nov. 18, 2019	Feb. 19, 2019	Jun. 30, 2017	Dec. 31, 2019	Nov. 19, 2019	Dec. 31, 2018	Jul. 18, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Outstanding debt						$ 0
Letters of credit outstanding				$ 31,800,000
Second Amendment To Restated 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Minimum current ratio required under financial covenant			1.25%
Second Amendment To Restated 2014 Loan and Security Agreement | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
Second Amendment To Restated 2014 Loan and Security Agreement | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Minimum
Debt Instrument [Line Items]
Adjusted quick ratio				1.00%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument term, years		4 years
Maximum borrowing capacity		$ 100,000,000			$ 100,000,000
Borrowings outstanding				$ 0
Letters of credit outstanding				30,700,000
Available borrowing capacity				69,300,000
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility
Debt Instrument [Line Items]
Debt instrument term, years		4 years
Maximum borrowing capacity		$ 100,000,000
Amount drawn under debt facility	$ 100,000,000
Debt instrument, amortization description		Loans under the Term Loan A Facility will amortize in equal quarterly installments beginning on March 31, 2020, in an aggregate annual amount equal to (i) on or prior to December 31, 2021, 1.25% of the drawn principal amount of the Term Loan Facility or $1.25 million and (ii) thereafter, 2.50% of the drawn principal amount of the Term Loan Facility or $2.5 million, with the remaining balance payable on the maturity date of the Term Loan A Facility in February 2023.
Debt instrument maturity month and year		2023-02
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility | On or Prior to December 31, 2021
Debt Instrument [Line Items]
Percentage of amortization on drawn principal amount		1.25%
Amortization, aggregate principal amount		$ 1,250,000
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility | Thereafter December 31, 2021
Debt Instrument [Line Items]
Percentage of amortization on drawn principal amount		2.50%
Amortization, aggregate principal amount		$ 2,500,000
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility | Adjusted One-Month LIBOR
Debt Instrument [Line Items]
Applicable margin based on secured leverage ratio	1.75%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Uncommitted Incremental Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 50,000,000
Debt to company's EBITDA, description		1.0x of the Company’s EBITDA for the most recently completed four fiscal quarter period
Morgan Stanley Senior Funding, Inc | Credit Agreement | Uncommitted Incremental Facility | Maximum
Debt Instrument [Line Items]
Secured leverage ratio		1.50%
Silicon Valley Bank | Restated 2014 LSA
Debt Instrument [Line Items]
Maximum borrowing capacity				5,000,000
Silicon Valley Bank | Restated 2014 LSA | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 30,000,000
Silicon Valley Bank | Third Amendment To Restated 2014 Loan and Security Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 5,000,000
Maximum borrowing capacity							$ 30,000,000

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense Recognized in Relation to Debt (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 11
Total interest expense	431
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility
Debt Instrument [Line Items]
Contractual interest expenses related to Term Loan A Facility	$ 420

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Option Plan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic value of stock options exercised	$ 474.2	$ 445.9	$ 20.4
Unrecognized stock compensation expense	$ 41.2
Expected weighted average period to recognize unrecognized stock compensation expense	1 year 9 months 10 days
Weighted average grant-date fair value of stock options granted	$ 39.23	$ 22.96	$ 3.73

Stockholders' Equity - Preferre

Stockholders' Equity - Preferred Stock - Additional Information (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019Class
Class Of Stock [Line Items]
Number of classes	2
Class A Common Stock
Class Of Stock [Line Items]
Common stock, voting right	one vote for each share
Class B Common Stock
Class Of Stock [Line Items]
Common stock, voting right	ten votes for each share

Stockholders' Equity - At-the-M

Stockholders' Equity - At-the-Market Offerings - Additional Information (Details) - At-the-Market Offerings - Class A Common Stock - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	Nov. 30, 2019	Mar. 12, 2019	May 31, 2019	Mar. 31, 2019	Nov. 19, 2019	May 16, 2019
Class Of Stock [Line Items]
Gross proceeds from issuance of common stock	$ 153,990		$ 82,900	$ 100,000
Number of shares Issued	1		1	1.4
Average selling price per share	$ 153.99		$ 82.90	$ 72
Stock Issuance Costs	$ 2,800		$ 1,600	$ 2,000
Maximum aggregate offering shares of common stock					1	1
Maximum
Class Of Stock [Line Items]
Gross proceeds from issuance of common stock		$ 100,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Issuance (Details) shares in Thousands	Dec. 31, 2019shares
Class Of Stock [Line Items]
Total reserved shares of common stock	34,707
Equity Incentive Plan
Class Of Stock [Line Items]
Common stock awards granted under equity incentive plans	15,668
2017 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock awards available for issuance	2,089	[1]
2017 Plan
Class Of Stock [Line Items]
Common stock awards available for issuance	16,950
[1]	The Company has not issued any common stock pursuant to the 2017 Employee Stock Purchase Plan.

Stockholders' Equity - Equity I

Stockholders' Equity - Equity Incentive Plans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019Plan
Class Of Stock [Line Items]
Number of equity incentive plans	2
2008 Plan and 2017 Plan | Employee Stock Option
Class Of Stock [Line Items]
Percentage of voting rights	10.00%
2008 Plan and 2017 Plan | Employee Stock Option | Minimum | 10% Shareholder
Class Of Stock [Line Items]
Stock option fair market value at the date of grant, percent	110.00%

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance Number of Shares, outstanding | shares	3,686
Number of Shares, Awarded | shares	2,228
Number of Shares, Released | shares	(822)
Number of Shares, Forfeited | shares	(548)
Ending balance, Number of Shares outstanding | shares	4,544
Weighted Average Grant Date Fair Value Per Share, Beginning balance | $ / shares	$ 48.50
Weighted Average Grant Date Fair Value Per Share, Awarded | $ / shares	87.60
Weighted Average Grant Date Fair Value Per Share, Released | $ / shares	49.26
Weighted Average Grant Date Fair Value Per Share, Forfeited | $ / shares	50.40
Weighted Average Grant Date Fair Value Per Share, Ending balance | $ / shares	$ 67.30

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Units - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected weighted average period to recognize unrecognized stock compensation expense	1 year 9 months 10 days
Restricted Stock Units
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Grant-date fair value of restricted stock units granted	$ 195.2
Unrecognized stock compensation expense	$ 267.7
Expected weighted average period to recognize unrecognized stock compensation expense	2 years 9 months 7 days
Intrinsic value of restricted stock units vested	$ 100.1	$ 12.7

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted, Weighted Average Grant Date Fair Value Per Share	$ 39.23	$ 22.96	$ 3.73
2008 Plan and 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance, Number of Shares	16,371
Granted, Number of Shares	572
Exercised, Number of Shares	(5,352)
Forfeited and expired, Number of Shares	(467)
Balance, Number of Shares	11,124	16,371
Options exercisable at December 31, 2019, Number of Shares	6,603
Balance, Weighted Average Exercise Price	$ 8.59
Granted, Weighted Average Exercise Price	100.06
Exercised, Weighted Average Exercise Price	5.35
Forfeited and expired, Weighted Average Exercise Price	8.77
Balance, Weighted Average Exercise Price	14.84	$ 8.59
Options exercisable at December 31, 2019, Weighted Average Exercise Price	$ 5.84
Balance, Weighted Average Remaining Contractual Life	6 years 2 months 12 days	6 years 9 months 18 days
Options exercisable at December 31, 2019, Weighted Average Remaining Contractual Life	5 years 1 month 6 days
Granted, Weighted Average Grant Date Fair Value Per Share	$ 39.23
Outstanding, ending balance	$ 1,324,461
Options exercisable, ending balance	$ 845,590

Stockholders' Equity - Stock-ba

Stockholders' Equity - Stock-based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019
Class Of Stock [Line Items]
Stock option term	10 years
Employee Stock Option | Tranche One
Class Of Stock [Line Items]
Stock granted to employees vesting rights, percentage	25.00%
Employee Stock Option | Tranche Two
Class Of Stock [Line Items]
Stock granted to employees vesting rights, terms of award	one year and then 1/48th monthly thereafter
Restricted Stock Units | Tranche One
Class Of Stock [Line Items]
Stock granted to employees vesting rights, percentage	25.00%
Restricted Stock Units | Tranche Two
Class Of Stock [Line Items]
Stock granted to employees vesting rights, terms of award	one year and then 1/16th quarterly thereafter

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Share-based Compensation Expense Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 85,175	$ 37,674	$ 10,953
Cost of Revenue | Platform
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	342	97	81
Cost of Revenue | Player
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,072	469	145
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	40,036	18,538	4,714
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	24,179	10,459	2,817
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 19,546	$ 8,111	$ 3,196

Stockholders' Equity - Expected

Stockholders' Equity - Expected Dividends - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019USD ($)
Equity [Abstract]
Expected dividend	$ 0

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Assumptions Used to Value Stock-Based Awards Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Risk-free interest rate, Minimum	1.35%	2.32%	1.87%
Risk-free interest rate, Maximum	2.56%	2.88%	2.25%
Expected volatility, Minimum	35.00%	38.00%	39.00%
Expected volatility, Maximum	36.00%	40.00%	44.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Expected term (in years)	5 years	5 years 3 months 18 days	5 years 3 months 18 days
Fair value of common stock			$ 2.56
Maximum
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Expected term (in years)	6 years 8 months 12 days	6 years 9 months 18 days	6 years 6 months
Fair value of common stock			$ 18.46

Stockholders' Equity - Stock Wa

Stockholders' Equity - Stock Warrants - Additional Information (Details) - shares	1 Months Ended
	Jul. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 02, 2017	Oct. 01, 2017
Class Of Warrant Or Right [Line Items]
Preferred stock, shares outstanding		0	0
Outstanding warrants		0	0
Class B Common Stock
Class Of Warrant Or Right [Line Items]
Outstanding warrants to purchase				200,000
Warrants exercised				1,900,000
Warrants cancelled				100,000
Warrants issued				1,800,000
Initial Public Offering | Class B Common Stock
Class Of Warrant Or Right [Line Items]
Outstanding warrants to purchase					2,200,000
Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Preferred stock, shares outstanding						2,200,000
Common Stock Warrants | Class B Common Stock
Class Of Warrant Or Right [Line Items]
Conversion of common stock warrants	400,000
Number of common stock warrants exercise	400,000

Stockholder's Equity - Summary

Stockholder's Equity - Summary of Assumptions Used to Value Convertible Preferred Stock Warrants (Details) - Convertible Preferred Stock Warrants	Dec. 31, 2017
Minimum | Expected term (in years)
Class Of Warrant Or Right [Line Items]
Fair value assumptions term	3 years
Minimum | Risk-free interest rate
Class Of Warrant Or Right [Line Items]
Fair value assumptions	1.5
Minimum | Expected volatility
Class Of Warrant Or Right [Line Items]
Fair value assumptions	44
Maximum | Expected term (in years)
Class Of Warrant Or Right [Line Items]
Fair value assumptions term	9 years 8 months 12 days
Maximum | Risk-free interest rate
Class Of Warrant Or Right [Line Items]
Fair value assumptions	2.3
Maximum | Expected volatility
Class Of Warrant Or Right [Line Items]
Fair value assumptions	51

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 31.8
Letters of credit expiration date	Dec. 31, 2030
Player | Cost of Revenue
Commitments And Contingencies [Line Items]
Expense related to patent infringements	$ 9.9
Reversal of revenue contingencies accrual		$ 8.9
Intellectual Property Licensing
Commitments And Contingencies [Line Items]
Loss contingencies accrual, change in estimated liabilities		8.9
Manufacturing
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	55.7	40.6
Manufacturing | Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss on purchase obligation for inventory	0.3	$ 0.1
Content License | Accrued Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	$ 1.7

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
United States	$ (63,453)	$ (11,128)	$ (63,831)
Foreign	2,534	1,795	637
Net loss before income taxes	$ (60,919)	$ (9,333)	$ (63,194)

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ (47)
State	244	$ 114	$ 89
Foreign	108	184	674
Current income tax expense	305	298	763
Deferred:
Foreign	(1,287)	(774)	(448)
Total	$ (982)	$ (476)	$ 315

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate	21.00%	21.00%	34.00%
U.S. state and local income taxes	(0.40%)	(1.30%)	(0.20%)
Change in valuation allowance	(213.40%)	(1039.40%)	19.00%
Federal research and development tax credit	30.80%	166.20%	5.20%
Convertible preferred stock warrants			(21.70%)
Stock-based compensation	158.00%	859.40%	1.20%
Meals and Entertainment	(1.40%)	(6.60%)	(1.10%)
Permanent items		(1.10%)
Foreign rate differential	(0.60%)	(1.50%)	0.20%
Acquisition costs	(1.30%)
Section 162(m) limitation	(1.40%)
State apportionment change	1.30%
Tax rate change	(0.40%)	2.40%	(36.40%)
Provision to return true-up	9.90%	5.90%
Other	(0.50%)	0.10%	(0.70%)
Effective tax rate	1.60%	5.10%	(0.50%)

Income Taxes - Summary of Signi

Income Taxes - Summary of Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 263,512	$ 128,829
Reserves and accruals	10,425	7,840
Research and development credits	73,442	39,344
Lease Obligation	81,639
Stock-based compensation	17,494	7,529
Total deferred tax assets	446,512	183,542
Deferred tax liabilities:
Right-of-use asset	(72,243)
Depreciation and amortization	(10,916)	(343)
Total deferred tax liabilities	(83,159)	(343)
Valuation allowance	(361,233)	(182,360)
Net deferred tax assets	$ 2,120	$ 839

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Ownership	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Income Taxes Disclosure [Line Items]
Increased in valuation allowance	$ 178,900	$ 114,100
Research and development tax credit carryforwards	73,442	39,344
Unrecognized tax benefits	19,487	$ 14,541	$ 5,843
Accrued interest and penalties	300
Research and Development Credits
Income Taxes Disclosure [Line Items]
Unrecognized tax benefits	18,300
Federal
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards	$ 1,005,400
Net operating loss carryforwards, expiration beginning year	2028
Research and development tax credit carryforwards	$ 58,300
Tax credit carryforwards, expiration beginning year	2028
State
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards	$ 851,700
Net operating loss carryforwards, expiration year	2019
Research and development tax credit carryforwards	$ 40,000
Tax credit carryforwards, expiration beginning year	2035
UK
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards	$ 9,400
Research and development tax credit carryforwards	200
Denmark
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards	$ 100
Section 382
Income Taxes Disclosure [Line Items]
Number of ownership changes for income tax purposes | Ownership	4
International
Income Taxes Disclosure [Line Items]
Unrecognized tax benefits	$ 1,200

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 14,541	$ 5,843
Gross increase for tax positions of current year	10,378	7,053
Gross decrease due to statue expiration	(88)
Gross increase for tax positions of prior years		1,645
Gross decrease for tax positions of prior years	(5,344)
Unrecognized tax benefits balance at end of year	$ 19,487	$ 14,541

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CEO Holds Majority Voting Interest
Related Party Transaction [Line Items]
Related party transaction expense	$ 1,200,000	$ 0	$ 0
Payable/ outstanding to related parties	0	0	0
Strategic Investors
Related Party Transaction [Line Items]
Revenue from related parties	8,500,000	4,100,000	600,000
Receivable from related parties	2,400,000	2,400,000
Related party transaction expense	1,300,000	1,300,000	$ 200,000
Payable/ outstanding to related parties	$ 400,000	$ 1,500,000

Retirement Plans - Additional I

Retirement Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employer contribution amount to plan	$ 0.5	$ 0.4	$ 0.3

Net Loss Per Share - Summary of

Net Loss Per Share - Summary of Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss allocable to common stockholders	$ (15,717)	$ (25,155)	$ (9,333)	$ (9,732)	$ 6,778	$ (9,527)	$ 526	$ (6,634)	$ (59,937)	$ (8,857)	$ (63,509)
Denominator:
Weighted-average shares used in computing net loss per share, basic and diluted									115,218	104,618	28,308
Net loss per share, basic and diluted	$ (0.13)	$ (0.22)	$ (0.08)	$ (0.09)					$ (0.52)	$ (0.08)	$ (2.24)

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted net loss per share	15,699	20,127	26,849
Equity Awards to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted net loss per share	15,668	20,057	26,608
Unvested Shares of Common Stock Issued Upon Early Exercise of Stock Options and Business Acquisition
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted net loss per share	31	70	57
Warrants to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted net loss per share			184

Segment Information - Additiona

Segment Information - Additional Information (Details) - segment	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of reportable segments	2
Net Revenue | Geographic Concentration Risk | International Market | Maximum
Segment Reporting Information [Line Items]
Concentration risk	10.00%	10.00%

Segment Information - Schedule

Segment Information - Schedule of Customer Accounting for 10% or More of Segment Revenue (Details) - Net Revenue - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Customer B
Entity Wide Revenue Major Customer [Line Items]
Concentration risk			10.00%
Customer C
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	14.00%	18.00%	20.00%
Customer E
Entity Wide Revenue Major Customer [Line Items]
Concentration risk			10.00%
Platform | Customer E
Entity Wide Revenue Major Customer [Line Items]
Concentration risk			13.00%
Player | Customer A
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	16.00%	15.00%	15.00%
Player | Customer B
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	17.00%	15.00%	12.00%
Player | Customer C
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	39.00%	38.00%	34.00%

Quarterly Financial Data (Una_3

Quarterly Financial Data (Unaudited) - Summary of the Company's Information on Total Revenue, Gross Profit, Net Income (Loss) and Earnings Per Share by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total Revenue	$ 411,230	$ 260,928	$ 250,101	$ 206,662	$ 275,739	$ 173,381	$ 156,810	$ 136,576	$ 1,128,921	$ 742,506	$ 512,763
Gross Profit	161,647	118,477	114,209	100,891	112,291	78,993	77,752	63,112	495,224	332,148	199,833
Net income (loss) attributable to common stockholders	$ (15,717)	$ (25,155)	$ (9,333)	$ (9,732)	$ 6,778	$ (9,527)	$ 526	$ (6,634)	$ (59,937)	$ (8,857)	$ (63,509)
Basic and diluted net loss per share attributable to common stockholders	$ (0.13)	$ (0.22)	$ (0.08)	$ (0.09)					$ (0.52)	$ (0.08)	$ (2.24)
Basic net income (loss) per share attributable to common stockholders					$ 0.06	$ (0.09)	$ 0.01	$ (0.07)
Diluted net income (loss) per share attributable to common stockholders					$ 0.05	$ (0.09)	$ 0	$ (0.07)