Roku (ROKU) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	ROKU
Entity Registrant Name	Roku, Inc.
Entity Current Reporting Status	Yes
Entity Central Index Key	0001428439
Current Fiscal Year End Date	--12-31
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 Tax Identification Number	262087865
Entity Address, Address Line One	150 Winchester Circle
Entity Address, City or Town	Los Gatos
Entity Address, State or Province	California
Entity Address, Postal Zip Code	95032
City Area Code	408
Local Phone Number	556-9040
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		85,421,696
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		30,812,380

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 375,509	$ 155,564
Short-term investments	10,987	42,146
Restricted cash	868	0
Accounts receivable, net of allowances	204,037	183,078
Inventories	39,443	35,585
Prepaid expenses and other current assets	19,063	15,374
Deferred cost of revenue, current	44	1,188
Total current assets	649,951	432,935
Property and equipment, net	48,402	25,264
Operating lease right-of-use assets	115,961
Intangible assets, net	1,200	1,477
Goodwill	1,382	1,382
Other non-current assets	3,929	3,939
Total Assets	820,825	464,997
Current Liabilities:
Accounts payable and accrued liabilities	201,732	148,562
Deferred revenue, current	36,536	45,442
Total current liabilities	238,268	194,004
Deferred revenue, non-current	13,889	19,594
Operating lease liability, non-current	105,513
Other long-term liabilities	2,473	6,748
Total Liabilities	360,143	220,346
Stockholders’ Equity:
Common stock, $0.0001 par value	12	11
Additional paid-in capital	733,627	498,553
Accumulated other comprehensive income (loss)	4	(17)
Accumulated deficit	(272,961)	(253,896)
Total stockholders’ equity	460,682	244,651
Total Liabilities and Stockholders’ Equity	$ 820,825	$ 464,997

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Revenue:
Total net revenue	$ 250,101	$ 156,810	$ 456,763	$ 293,386
Cost of Revenue:
Total cost of revenue	135,892	79,058	241,663	152,522
Gross Profit:
Total gross profit	114,209	77,752	215,100	140,864
Operating Expenses:
Research and development	61,994	40,196	117,732	74,322
Sales and marketing	36,568	22,259	70,375	42,577
General and administrative	26,033	15,429	48,119	30,999
Total operating expenses	124,595	77,884	236,226	147,898
Loss from Operations	(10,386)	(132)	(21,126)	(7,034)
Other Income, Net:
Interest expense	(571)	(57)	(669)	(108)
Other income, net	1,240	361	2,207	809
Total other income, net	669	304	1,538	701
Income (Loss) Before Income Taxes	(9,717)	172	(19,588)	(6,333)
Income tax (benefit) expense	(384)	(354)	(523)	(225)
Net Income (Loss)	$ (9,333)	$ 526	$ (19,065)	$ (6,108)
Net income (loss) per share —basic	$ (0.08)	$ 0.01	$ (0.17)	$ (0.06)
Net income (loss) per share —diluted	$ (0.08)	$ 0	$ (0.17)	$ (0.06)
Weighted-average shares used in computing net income (loss) per share —basic	114,572	102,652	112,734	101,079
Weighted-average shares used in computing net income (loss) per share —diluted	114,572	121,698	112,734	101,079
Player | Goods
Net Revenue:
Total net revenue	$ 82,419	$ 66,469	$ 154,928	$ 127,968
Cost of Revenue:
Total cost of revenue	77,912	51,730	143,319	103,528
Gross Profit:
Total gross profit	4,507	14,739	11,609	24,440
Platform | Services
Net Revenue:
Total net revenue	167,682	90,341	301,835	165,418
Cost of Revenue:
Total cost of revenue	57,980	27,328	98,344	48,994
Gross Profit:
Total gross profit	$ 109,702	$ 63,013	$ 203,491	$ 116,424

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income (Loss)	$ (9,333,000)	$ 526,000	$ (19,065,000)	$ (6,108,000)
Other comprehensive income, net of tax:
Unrealized gain on short-term investments, net of tax	3,000	0	21,000	0
Comprehensive Net Income (Loss)	$ (9,330,000)	$ 526,000	$ (19,044,000)	$ (6,108,000)

Condensed Consolidated Statem_3

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income / (Loss)	Accumulated Deficit
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
Vesting of early exercised stock options	173,000		173,000
Issuance of common stock pursuant to equity incentive plans, net of taxes	17,384,000	$ 1,000	17,435,000	(52,000)
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares		5,763
Issuance of common stock pursuant to exercise of common stock warrants, net, Shares		141
Stock-based compensation expense	9,738,000		9,738,000
Unrealized gain on short-term investments, net of tax	0
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
Net loss	(6,108,000)					(6,108,000)
Balance at Jun. 30, 2018	211,765,000	$ 11,000	463,624,000	(723,000)		(251,147,000)
Balance, Shares at Jun. 30, 2018		105,061
Balance at Mar. 31, 2018	193,476,000	$ 10,000	445,862,000	(723,000)		(251,673,000)
Balance, Shares at Mar. 31, 2018		100,968
Vesting of early exercised stock options	67,000		67,000
Issuance of common stock pursuant to equity incentive plans, net of taxes	12,387,000	$ 1,000	12,386,000
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares		4,093
Stock-based compensation expense	5,309,000		5,309,000
Unrealized gain on short-term investments, net of tax	0
Net loss	526,000					526,000
Balance at Jun. 30, 2018	211,765,000	$ 11,000	463,624,000	(723,000)		(251,147,000)
Balance, Shares at Jun. 30, 2018		105,061
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
Vesting of early exercised stock options	32,000		32,000
Share repurchases, Shares		(2)
Issuance of common stock pursuant to equity incentive plans, net of taxes	19,148,000	$ 1,000	19,147,000
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares		4,002
Issuance of common stock in connection with at-the-market offering, net of issuance costs	179,360,000		179,360,000
Issuance of common stock in connection with at-the-market offering, net of issuance costs, Shares		2,389
Stock-based compensation expense	36,535,000		36,535,000
Unrealized gain on short-term investments, net of tax	21,000				21,000
Net loss	(19,065,000)					(19,065,000)
Balance at Jun. 30, 2019	460,682,000	$ 12,000	734,298,000	(671,000)	4,000	(272,961,000)
Balance, Shares at Jun. 30, 2019		116,159
Balance at Mar. 31, 2019	360,934,000	$ 11,000	625,221,000	(671,000)	1,000	(263,628,000)
Balance, Shares at Mar. 31, 2019		113,292
Vesting of early exercised stock options	15,000		15,000
Issuance of common stock pursuant to equity incentive plans, net of taxes	9,057,000	$ 1,000	9,056,000
Issuance of common stock pursuant to equity incentive plans, net of taxes, Shares		1,867
Issuance of common stock in connection with at-the-market offering, net of issuance costs	81,335,000		81,335,000
Issuance of common stock in connection with at-the-market offering, net of issuance costs, Shares		1,000
Stock-based compensation expense	18,671,000		18,671,000
Unrealized gain on short-term investments, net of tax	3,000				3,000
Net loss	(9,333,000)					(9,333,000)
Balance at Jun. 30, 2019	$ 460,682,000	$ 12,000	$ 734,298,000	$ (671,000)	$ 4,000	$ (272,961,000)
Balance, Shares at Jun. 30, 2019		116,159

Condensed Consolidated Statem_4

Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Statement Of Stockholders Equity [Abstract]
At the market offering issuance cost	$ 1.6	$ 3.6

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (19,065)	$ (6,108)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,677	3,606
Stock-based compensation expense	36,535	9,738
Provision for doubtful accounts	53	286
Non-cash interest expense	412
Loss from exit of facilities		385
Amortization of premiums on short-term investments	(265)
Changes in operating assets and liabilities:
Accounts receivable	(21,012)	9,383
Inventories	(3,858)	(6,799)
Prepaid expenses and other current assets	(5,377)	309
Operating lease right-of-use assets	7,738
Deferred cost of revenue	1,144	2,010
Other noncurrent assets	10	(1,333)
Accounts payable and accrued liabilities	32,255	(19,000)
Operating lease liabilities	(4,405)
Other long-term liabilities	(1,197)	(558)
Deferred revenue	(14,611)	(3,387)
Net cash provided by (used in) operating activities	14,034	(11,468)
Cash flows from investing activities:
Purchase of property and equipment	(23,171)	(9,013)
Purchases of short-term investments	(12,365)
Sales/maturities of short-term investments	43,810
Net cash provided by (used in) investing activities	8,274	(9,013)
Cash flows from financing activities:
Proceeds from equity issued under incentive plans	19,145	17,398
Proceeds from equity issued under at-the-market program, net of offering costs	179,360
Net cash provided by financing activities	198,505	17,398
Net Increase (Decrease) in cash, cash equivalents and restricted cash	220,813	(3,083)
Cash, cash equivalents and restricted cash—Beginning of period	155,564	177,250
Cash, cash equivalents and restricted cash—End of period	376,377	174,167
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents	375,509	174,167
Restricted cash	868
Cash, cash equivalents and restricted cash—End of period	376,377	174,167
Supplemental disclosures of cash flow information:
Cash paid for interest	960	1
Cash paid for income taxes	636	349
Supplemental disclosures of non-cash investing and financing activities:
Unpaid portion of property and equipment purchases	6,984	$ 1,043
Unpaid portion of at-the-market offering costs	$ 459

The Company

The Company	6 Months Ended
	Jun. 30, 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, TV episodes, live programming and more. The Company operates in two reportable segments and generates revenue through the sale of streaming players, advertising, content distribution, subscription and transaction revenue sharing, as well as through licensing arrangements with TV brands.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on March 1, 2019. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date but does not include all of the information and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The interim financial information is unaudited, but reflects all normal recurring adjustments that are, in the opinion of management, necessary to fairly present the information set forth herein. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the operating results to be expected for the full year or any future periods. There have been no material changes in the Company’s significant accounting policies other than the adoption of Accounting Standards Update (“ASU”) ASU 2016-02 , Leases (Topic 842), Use of Judgements and Estimates The preparation of the Company’s condensed 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 and liabilities and related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. 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 reporting, evaluation of customer versus vendor relationships, and other obligations such as sales return reserves and customer incentive programs; 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. Principles of Consolidation The condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Comprehensive Income (Loss) Comprehensive income (loss) includes unrealized gains (loss) on the Company’s short-term investments for the three and six months ended June 30, 2019. The Company did not have any short-term investments during the three and six months ended June 30, 2018. As a result, comprehensive income (loss) was equal to the net loss for the three and six months ended June 30, 2018. Concentrations Customers accounting for 10% or more of the Company’s net revenue were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Customer B * * 10 % * Customer C 14 % 17 % 13 % 17 % Customers accounting for 10% or more of the Company’s accounts receivable were as follows: As of June 30, 2019 December 31, 2018 Customer D 11 % 11 % * Less than 10% Restricted Cash Restricted cash is comprised of cash collateral for outstanding letters of credit related to operating leases of office facilities. As of June 30, 2019, the Company had restricted cash of $0.9 million. The Company did not have any restricted cash as of December 31, 2018. Content Licensing The Company acquires rights to video content for viewing on The Roku Channel. Consideration for these content rights can include a fixed fee and/or a share of advertising revenue. The Company capitalizes content licensing fees and records a corresponding liability when the license period has begun, the cost of the licensed content is determinable, 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 June 30, 2019, . Recently In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-02, Leases (Topic 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 condensed 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 condensed consolidated balance sheet. There was Recently Issued Accounting Pronouncements Not Yet Adopted 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 . This standard removes, modifies, and adds certain disclosure requirements for fair value measurements. This pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company is currently in the process of evaluating the effects of the new guidance but does not expect the impact from this standard to be material. 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	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Revenue	3. REVENUE Revenue Recognition The Company enters into contracts that may include various product and service offerings, which are generally capable of being distinct and are accounted for as separate performance obligations. Revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or service Shipping charges billed to customers are included in revenue and the related shipping costs are included in cost of revenue. Revenue is recorded net of taxes collected or accrued. Sales taxes are recorded as current liabilities until 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. Arrangements with Multiple Performance Obligations The Company’s contracts may contain multiple distinct performance obligations. The computed transaction price of each contract is allocated to each 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 a market assessment approach, or on an expected cost-plus margin approach. Nature of Products and Services Platform Segment: The Company’s platform segment generates revenue from advertising sales, subscription and transaction revenue shares, the sale of branded channel buttons on remote controls and licensing arrangements with TV brands and service operators. Player Segment: The Company sells the majority of its players through retail distribution channels in the U.S., including brick and mortar and online retailers, as well as through the Company’s website. 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. Revenue Disaggregation The Company’s disaggregated revenue is represented by the two reportable segments discussed in Note 14. 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. 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 $ 105.2 m illion as of June 30, 2019 of which we expect to recognize approximately 81 % over the next 12 months and the remainder thereafter. In the three and six months ended June 30, 2019 the amount of platform revenue recognized from performance obligations satisfied, or partially satisfied, in prior reporting periods totaled $5.3 million. Contract Balances Contract balances include the following (in thousands): As of June 30, 2019 December 31, 2018 Accounts receivable, net $ 204,037 $ 183,078 Contract assets (included in Prepaid expenses and other current assets) 2,016 753 Deferred revenue, current 36,536 45,442 Deferred revenue, non-current 13,889 19,594 Total deferred revenue $ 50,425 $ 65,036 Accounts receivable are recorded at the amount invoiced, net of an allowance for doubtful accounts 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. Contract liabilities are included in deferred revenue and reflect consideration invoiced prior to the completion of performance obligations and revenue recognition. Contract assets increased by approximately $1.3 million during the six months ended June 30, 2019 primarily due to an increase in the growth of platform revenue combined with the timing of billing which falls into a subsequent period. Deferred revenue decreased by approximately $14.6 million during the six months ended June 30, 2019 primarily due to revenue recognized of $5.0 million pursuant to customer acceptance of a milestone, revenue recognized of $5.3 million due to an increase in the estimated transaction prices of performance obligations satisfied in previous periods, and the remaining revenue recognized primarily relates to the timing of fulfillment of performance obligations.

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	4. Balance sheet components Accounts Receivable, Net of allowances —Accounts receivable, net of allowances, consisted of the following (in thousands): June 30, 2019 December 31, 2018 Gross accounts receivable $ 218,296 $ 204,975 Allowance for sales returns (5,250 ) (7,335 ) Allowance for sales incentives (8,583 ) (13,750 ) Other allowances (426 ) (812 ) Total allowances (14,259 ) (21,897 ) Total Accounts Receivable—net of allowances $ 204,037 $ 183,078 Allowance for Sales Returns —Allowance for sales returns consisted of the following activities (in thousands): June 30, 2019 December 31, 2018 Beginning balance $ (7,335 ) $ (6,907 ) Charged to revenue (6,728 ) (17,396 ) Utilization of sales return reserve 8,813 16,968 Ending balance $ (5,250 ) $ (7,335 ) Allowance for Sales Incentives —Allowance for sales incentives consisted of the following activities (in thousands): June 30, 2019 December 31, 2018 Beginning balance $ (13,750 ) $ (10,442 ) Charged to revenue (16,663 ) (50,958 ) Utilization of sales incentive reserve 21,830 47,650 Ending balance $ (8,583 ) $ (13,750 ) Property and Equipment, Net —Property and equipment, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Computers and equipment $ 19,981 $ 16,056 Leasehold improvements 39,293 18,396 Website and internal-use software 6,507 6,423 Office equipment and furniture 7,645 4,069 Total property and equipment 73,426 44,944 Accumulated depreciation and amortization (25,024 ) (19,680 ) Property and Equipment, net $ 48,402 $ 25,264 Depreciation and amortization expense, for property and equipment assets, for the three months ended June 30, 2019 and 2018 was $2.7 million and $1.8 Accounts Payable and Accrued Liabilities —Accounts payable and accrued liabilities consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accounts payable $ 62,002 $ 56,576 Accrued royalty expense 8,294 7,939 Accrued inventory 8,392 6,008 Accrued payroll and related expenses 14,816 12,217 Accrued cost of revenue 26,191 22,830 Payments due to content publishers 47,630 32,463 Operating lease liability, current 15,946 — Customer prepayments 5,069 3,124 Taxes and related liabilities 840 1,314 Accrued legal fees 2,845 — Other accrued expenses 9,707 6,091 Total Accounts Payable and Accrued Liabilities $ 201,732 $ 148,562 Deferred Revenue —Deferred revenue consisted of the following (in thousands): June 30, 2019 December 31, 2018 Platform, current $ 17,873 $ 28,569 Player, current 18,663 16,873 Total deferred revenue, current 36,536 45,442 Platform, non-current 7,192 12,783 Player, non-current 6,697 6,811 Total deferred revenue, non-current 13,889 19,594 Total Deferred Revenue $ 50,425 $ 65,036

Short-Term Investments

Short-Term Investments	6 Months Ended
	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Short-Term Investments	5. SHORT-TERM INVESTMENTS The following is a summary of the Company’s short-term investments (in thousands): June 30, 2019 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Corporate bonds and commercial paper $ 5,989 $ 3 $ - $ 5,992 $ 37,168 $ — $ (17 ) $ 37,151 U.S. government securities 4,994 1 — 4,995 4,995 — — 4,995 Total Short-Term Investments $ 10,983 $ 4 $ - $ 10,987 $ 42,163 $ — $ (17 ) $ 42,146 Tax effects related to unrealized losses are not material for all periods presented. The following table summarizes the maturities of the Company’s short-term investments by contractual maturity (in thousands): June 30, 2019 December 31, 2018 Amortized Cost Fair Value Amortized Cost Fair Value Less than 1 year $ 10,983 $ 10,987 $ 42,163 $ 42,146 Due in 1-3 years — — — Total Short-Term Investments $ 10,983 $ 10,987 $ 42,163 $ 42,146

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value	6. FAIR VALUE We measure our financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability in the principal market or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. The Company’s financial assets measured at fair value are as follows (in thousands): June 30, 2019 December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 335,320 $ 335,320 $ — $ 147,221 $ 147,221 $ — Money market funds 40,189 40,189 — 8,343 8,343 — Restricted cash 868 868 — — — — Short-term investments: Corporate bonds and commercial paper 5,992 — 5,992 37,151 — 37,151 U.S. government securities 4,995 — 4,995 4,995 — 4,995 Total assets measured and recorded at fair value $ 387,364 $ 376,377 $ 10,987 $ 197,710 $ 155,564 $ 42,146 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. The Company considers all highly liquid investments purchased with an original or remaining maturity of less than three months at the date of purchase to be cash equivalents. The Company measured money market funds of $40.2 million and $8.3 million as cash equivalents as of June 30, 2019 and December 31, 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 use Level 3 inputs to measure any assets or liabilities as of June 30, 2019 and December 31, 2018.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	7. LEASES The Company determines if an arrangement contains a lease at its inception. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term and leases are included in operating lease ROU assets, accrued liabilities, for the current portion of operating lease liabilities, and operating lease liabilities, non-current on our consolidated balance sheets. As the rate implicit in the lease is not readily determinable, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future lease payments. The Company took into consideration its credit rating and the length of the lease when calculating the incremental borrowing rate. The Company considers the options to extend or terminate the lease in determining the lease term, when it is reasonably certain to exercise one of the options. The Company combines lease and non-lease components into a single lease component for its real estate and equipment leases. The Company has entered into operating leases primarily for office real estate. The leases have remaining lease terms ranging from to . Some leases include an option to extend the leases for up to and some leases include an option to terminate after . The Company earns sublease income from subleases for a portion of the former headquarters. The subleases expire in 2020. The components of lease expense are as follows (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 5,830 $ 10,162 Sublease income (546 ) (1,126 ) Net operating lease cost $ 5,284 $ 9,036 Supplemental cash flow information related to leases is as follows (in thousands): Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 7,440 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 83,780 Supplemental balance sheet information related to leases was as follows (in thousands, except lease term and discount rate As of June 30, 2019 Operating lease right-of-use assets $ 115,961 Included in accounts payable and accrued liabilities: Operating lease liability, current 15,946 Operating lease liability, non-current 105,513 Total operating lease liability $ 121,459 Weighted Average Remaining Lease Term Operating leases (in years) 9.14 Weighted Average Discount Rate Operating leases 5.51 % Future lease payments under operating leases as of June 30, 2019 were as follows (in thousands): Year ending December 31, Operating Leases 2019 (remaining 6 months) $ 9,753 2020 19,304 2021 21,946 2022 18,107 2023 18,448 Thereafter 97,240 Total future lease payments 184,798 Less: imputed interest (39,960 ) Less: expected tenant improvement allowance (23,379 ) Total $ 121,459 As of June 30, 2019, the Company has additional operating leases, primarily corporate offices, that have not yet commenced of $153.8 million. These 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

Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Debt	8. DEBT The Company did not have any outstanding debt as of June 30, 2019 and December 31, 2018. 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”). The Amendment increased the level of new term loan commitments and new revolving commitments under the Credit Agreement by an aggregate amount of $50.0 million. The Credit Agreement now provides for (i) a four-year revolving credit facility in the aggregate principal amount of up to $100.0 million (the “Revolving Credit Facility”), (ii) a four-year delayed draw term loan A facility in the aggregate principal amount of up to $ 100.0 million (the “Term Loan A Facility”) and (iii) an uncommitted incremental facility, subject to the satisfaction of certain financial and other conditions, in the amount of up to (v) $ 50.0 million, plus (w) 1.0x of the Company’s EBITDA for the most recently completed four fiscal quarter period , plus (x) an additional amount at the Company’s discretion, so long as, on a pro forma basis at the time of incurrence, the Company’s secured leverage ratio does not exceed 1.50 to 1.00, plus (y) voluntary prepayments of the Revolving Credit Facility and Term Loan A Facility to the extent accompanied by concurrent reductions to the applicable Credit Facility, plus (z) for up to 90 days after the Original Closing Date, $ 25.0 million (together with the Revolving Credit Facility and the Term Loan A Facility, collectively, the “Credit Facility”). Borrowings under the Term Loan A Facility may be made by the Company up to nine months immediately following the Original Closing Date (the “Term Loan A Availability Period”). Each lender’s obligation to fund future loans or issue future letters of credit under the Credit Facility is subject to the satisfaction of certain conditions set forth in the Credit Agreement. On the Closing Date, the Company terminated its Restated 2014 LSA (as defined below) with Silicon Valley Bank. Loans under the Credit Facility bear interest at a rate equal to, at the Company’s election, (i) an alternate base rate, based upon the highest of (x) the prime rate published by the Wall Street Journal, (y) the federal funds effective date plus ½ of 1% and (z) the one-month LIBOR plus 1%, in each case plus an applicable margin of up to 1% per annum, with step-downs based on its secured leverage ratio or (2) an adjusted one-, two-, three-, or six month LIBOR, at its election, plus an applicable margin of up to 2% per annum, with step-downs based on its secured leverage ratio. Loans under the Term Loan A Facility will amortize in equal quarterly installments beginning on the last day of the fiscal quarter ending after the date of the initial borrowing under the Term Loan A Facility, 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 and (ii) thereafter, 2.50% of the drawn principal amount of the Term Loan Facility, with any remaining balance payable on the maturity date of the Term Loan A Facility. 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 June 30, 2019, the Company is in compliance with all the covenants of the Credit Agreement. The Company incurred debt issuance costs for the Credit Agreement, which are amortized over the contractual term of the agreement. Debt issuance costs are recorded in prepaid expenses and other current assets on the condensed consolidated balance sheet. Line of Credit with Silicon Valley Bank The Company first 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	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Stockholders' Equity	9. STOCKHOLDERS’ EQUITY 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, pursuant to which the Company could issue and sell from time-to-time up to $100.0 million maximum aggregate offering price of the Company’s Class A common stock. In March 2019, the Company received gross proceeds of $100.0 million from sales of approximately 1.4 million shares at an average selling price of $72.00 per share and incurred issuance costs of $2.0 million. As of March 31, 2019, the Company had sold all available shares of Class A common stock under this agreement. On May 16, 2019, the Company entered into an Equity Distribution Agreement with Morgan Stanley & Co. LLC, as its sales agent, pursuant to which the Company could issue and sell up to 1.0 million shares of the Company’s Class A common stock. As of June 30, 2019, the Company received gross proceeds of $82.9 million from the sale of these 1.0 million shares at an average selling price of $82.90 per share and incurred issuance costs of $1.6 million. Preferred Stock The Company is authorized to issue 10 million shares of undesignated preferred stock with rights and preferences determined by the Company’s Board of Directors at the time of issuance. As of June 30, 2019 and December 31, 2018, there were no shares of preferred stock issued and outstanding. Common Stock The Company has two classes of authorized common stock, Class A common stock and Class B common stock. All shares of common stock outstanding immediately prior to the initial public offering (“IPO”), including shares of common stock issued upon the conversion of the convertible preferred stock, were converted into an equivalent number of shares of Class B common stock. All common stock, stock options, and restricted stock units issued at the time of, and subsequent to, the IPO are exercised or vested into shares of Class A common stock. The Company has reserved the following shares of common stock for future issuances (in thousands): As of June 30, 2019 Common stock awards granted under equity incentive plans 16,595 Common stock awards available for issuance under Employee Stock Purchase Plan 2,089 Common stock awards available for issuance under the 2017 Equity Incentive Plan 18,190 Total reserved shares of common stock 36,874 Equity Incentive Plans The 2008 Equity Incentive Plan (the “2008 Plan”) became effective in February 2008. The 2008 Plan allowed for the grant of incentive stock options to employees and non-statutory stock options and restricted stock awards to employees, directors and consultants. Subject to certain limitations, options granted under the 2008 Plan were granted at a price per share equivalent to the fair market value on the date of grant and generally vest over four years and have a term of 10 years. Outstanding stock options granted under the 2008 Plan, prior to the Company’s IPO, are exercisable for Class B common stock. Following the Company’s IPO, no further equity awards could be made pursuant to the 2008 Plan. The 2017 Equity Incentive Plan (the “2017 Plan”) became effective in September 2017. The 2017 Plan provides for the grant of incentive stock options to employees and for the grant of non-statutory stock options and restricted stock awards, as well as other forms of equity compensation to employees, directors and consultants. Stock options and restricted stock units under the 2017 Plan are generally expensed over four years and have a term of 10 years. Only shares of Class A common stock are issued pursuant to equity awards granted under the 2017 Plan. Stock-Based Compensation The Company measures the cost of awards granted under equity incentive plans based on the grant date fair value. The Company uses the straight-line method for expense recognition and recognizes forfeitures as they occur. The following table shows total stock-based compensation expense for the three and six months ended June 30, 2019 and 2018 (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Cost of platform revenue $ 59 $ 19 $ 118 $ 38 Cost of player revenue 246 67 489 111 Research and development 9,258 2,801 17,790 5,097 Sales and marketing 4,974 1,286 10,140 2,396 General and administrative 4,134 1,136 7,998 2,096 Total stock-based compensation $ 18,671 $ 5,309 $ 36,535 $ 9,738 Stock Options The summary of the Company’s stock option activity is as follows (in thousands, except price 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 - outstanding 16,371 $ 8.59 — Granted 26 80.25 — $ 28.95 Exercised (3,625 ) 5.37 — — Forfeited and expired (339 ) 8.39 — — Balance, June 30, 2019 - outstanding 12,433 $ 9.68 6.5 — $ 1,005,879 Options exercisable at June 30, 2019 6,860 $ 5.12 5.2 — $ 586,269 The intrinsic value for options exercised during the three months ended June 30, 2019 and 2018, was million, respectively, and during the six months ended June 30, 2019 and 2018 was $245.5 million and $197.0 million, respectively. Intrinsic value represents the difference between the fair values of the Company’s common stock and the exercise prices on the date of grant. As of , the Company had $ million of unrecognized stock compensation expense related to unvested stock options that is expected to be recognized over a weighted-average period of approximately The fair value of options granted under the equity incentive plans is estimated on the grant date using the Black-Scholes option-valuation model. The assumptions used in the Black-Scholes model are as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Dividend rate — — — — Expected term (in years) 5.0 - 5.27 5.3 - 6.1 5.0 - 5.27 5.3 - 6.1 Risk-free interest rate 1.83 - 2.31% 2.61 - 2.88% 1.83 - 2.56% 2.32 - 2.88% Expected volatility 36 % 38 - 39% 36 % 38 - 40% Restricted Stock Units Pursuant to the 2017 Plan, the Company grants restricted stock units to employees. The fair value of restricted stock units is based on the Company’s closing stock price on the date of grant. The summary of the Company’s restricted stock unit activity is as follows (in thousands, except price per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Balance, December 31, 2018 - outstanding 3,686 $ 48.50 Awarded 1,081 57.36 Released (381 ) 46.16 Forfeited (224 ) 53.46 Balance, June 30, 2019 - outstanding 4,162 $ 50.75 The unrecognized compensation cost related to restricted stock units as of June 30, 2019 was $189.1 million, which the Company expects to recognize over 3.0 years. The intrinsic value of restricted stock units that vested during the three months ended June 30, 2019 and 2018 was $19.4 million and $0.3 million, respectively, and during the six months ended June 30, 2019 and 2018 was $30.8 million and $0.3 million, respectively, which represented the fair value of the Company’s common stock underlying the restricted stock units on their vesting date.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. COMMITMENTS AND CONTINGENCIES Outstanding Commitments The Company has contracts with vendors for the manufacture of inventory and related items. The Company also has contracts with content providers and other vendors for content licensing and advertising buys in the normal course of business. As of June 30, 2019, the Company had $52.8 million purchase commitments for inventory and related items and $75.9 million for content licensing, advertising buys and other platform services. The Company records a liability for noncancelable purchase commitments in excess of its future demand forecasts. The amounts recorded by the Company Content Licensing The Company licenses certain content for users to access through The Roku Channel. The Company records an obligation for licensing of content when it enters into an agreement to obtain future titles and the cost of the content is known. Certain agreements include the obligation to license rights for unknown future titles, the ultimate quantity and/or fees for which are not yet determinable as of the reporting date. As of June 30, 2019, the amounts recorded in “Accrued liabilities” for license purchase commitments were not material. Letters of Credit As of June 30, 2019 and December 31, 2018, the Company had irrevocable letters of credit outstanding in the amount of $31.3 million, related to facilities leases. The letters of credit have various expiration dates through 2030. Contingencies The Company accrues for loss contingencies, including liabilities for intellectual property licensing, when it believes such losses are probable and reasonably estimable. The Company is currently involved in, and may in the future be involved in, legal proceedings, claims, and investigations in the ordinary course of business, including claims for infringing patents, copyrights or other intellectual property rights related to its platform and products, or the content distributed through its platform by the Company or third-party channel developers. 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 Many of the Company’s agreements include provisions for indemnifying content publishers, licensees, distributors, retailers, contract manufacturers and suppliers in the event that the Company’s products or services or the Company’s technologies incorporated therein, infringe on a third party’s intellectual property rights. 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 has not accrued any liabilities related to such obligations in the consolidated financial statements.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	11. INCOME TAXES Income tax benefit for the three months ended June 30, 2019 and 2018 was $0.4 million, and income tax benefit for the six months ended June 30, 2019 and 2018 was $0.5 million and $0.2 million, respectively. The income tax benefit for the three and six months ended June 30, 2019 and 2018, was primarily attributable to non-U.S. tax benefit associated with the Company's non-U.S. operation. Based on the available objective evidence during the three months ended June 30, 2019, the Company believes it is more likely than not that the tax benefits of the U.S. losses incurred may not be realized. Accordingly, the Company recorded a full valuation allowance against the tax benefits of the U.S. losses incurred. The primary difference between the effective tax rate and the statutory tax rate relates to the valuation allowance on the Company’s U.S. losses. 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 June 30, 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., China, and Denmark.

Related-Party Transactions

Related-Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	12. RELATED-PARTY TRANSACTIONS The Company has transactions with one of the Company’s strategic investors. With respect to this investor, the Company recorded revenue of $2.0 million and $0.7 million for the three months ended June 30, 2019 and 2018, respectively, and $4.6 million and $1.7 million for the six months ended June 30, 2019 and 2018, respectively

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	13. NET INCOME (LOSS) PER SHARE The Company’s basic net income (loss) per share is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding for the period. For purposes of the calculation of diluted net income (loss) per share options to purchase common stock, restricted stock units and unvested shares of common stock issued upon the early exercise of stock options are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share as their effect is antidilutive. The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share data): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Numerator: Net income (loss) $ (9,333 ) $ 526 $ (19,065 ) $ (6,108 ) Denominator: Weighted-average shares used in computing net income (loss) per share, basic and diluted 114,572 102,652 112,734 101,079 Net income (loss) per share, basic and diluted $ (0.08 ) $ 0.01 $ (0.17 ) $ (0.06 ) Weighted-average shares used in computing net income (loss) per share, diluted 114,572 121,698 112,734 101,079 Net income (loss) per share, diluted $ (0.08 ) $ 0.00 $ (0.17 ) $ (0.06 ) Common shares that would be excluded from the calculation of diluted net loss per share because of their anti-dilutive effect are as follows (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Equity awards to purchase common stock 16,595 1,062 16,595 21,485 Unvested shares of common stock issued upon early exercise of stock options and business acquisition 45 — 45 105 Total 16,640 1,062 16,640 21,590

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Information	14. SEGMENT INFORMATION The Company is organized into two reportable segments as follows: Platform —Consists primarily of fees received from advertising sales, subscription and transaction revenue shares, sales of branded channel buttons on remote controls and licensing arrangements with TV brands and service operators. The Company’s first-party video ad inventory includes native display ads on home screens and screen savers as well as ad inventory obtained through content publisher agreements. To supplement supply, the Company can re-sell video inventory purchased from content publishers and, to a lesser extent, directly sell third-party inventory on a revenue share basis. Player —Consists primarily of net sales of streaming media players and accessories through retailers and distributors, as well as directly to customers through the Company’s website. Customers accounting for 10% or more of segment revenue were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Platform segment revenue Customer D * * 10 % * Customer G * * * 10 % Player segment revenue Customer A 14 % 16 % 16 % 14 % Customer B 17 % 10 % 19 % 14 % Customer C 40 % 39 % 38 % 38 % * Less than 10% of segment revenue Substantially all of the Company’s assets were held in the United States and were attributable to the operations in the United States as of June 30, 2019 and December 31, 2018. Revenue in international markets

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on March 1, 2019. The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date but does not include all of the information and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The interim financial information is unaudited, but reflects all normal recurring adjustments that are, in the opinion of management, necessary to fairly present the information set forth herein. The results of operations for the three and six months ended June 30, 2019 are not necessarily indicative of the operating results to be expected for the full year or any future periods. There have been no material changes in the Company’s significant accounting policies other than the adoption of Accounting Standards Update (“ASU”) ASU 2016-02 , Leases (Topic 842),
Use of Judgments and Estimates	Use of Judgements and Estimates The preparation of the Company’s condensed 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 and liabilities and related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. 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 reporting, evaluation of customer versus vendor relationships, and other obligations such as sales return reserves and customer incentive programs; 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.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements have been prepared in accordance with U.S. GAAP and include the accounts of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) includes unrealized gains (loss) on the Company’s short-term investments for the three and six months ended June 30, 2019. The Company did not have any short-term investments during the three and six months ended June 30, 2018. As a result, comprehensive income (loss) was equal to the net loss for the three and six months ended June 30, 2018.
Concentrations	Concentrations Customers accounting for 10% or more of the Company’s net revenue were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Customer B * * 10 % * Customer C 14 % 17 % 13 % 17 % Customers accounting for 10% or more of the Company’s accounts receivable were as follows: As of June 30, 2019 December 31, 2018 Customer D 11 % 11 % * Less than 10%
Restricted Cash	Restricted Cash Restricted cash is comprised of cash collateral for outstanding letters of credit related to operating leases of office facilities. As of June 30, 2019, the Company had restricted cash of $0.9 million. The Company did not have any restricted cash as of December 31, 2018.
Content Licensing	Content Licensing The Company acquires rights to video content for viewing on The Roku Channel. Consideration for these content rights can include a fixed fee and/or a share of advertising revenue. The Company capitalizes content licensing fees and records a corresponding liability when the license period has begun, the cost of the licensed content is determinable, 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 June 30, 2019, .
Recently Adopted Accounting Standards and Recently Issued Accounting Pronouncements Not Yet Adopted	Recently In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-02, Leases (Topic 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 condensed 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 condensed consolidated balance sheet. There was Recently Issued Accounting Pronouncements Not Yet Adopted 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 . This standard removes, modifies, and adds certain disclosure requirements for fair value measurements. This pronouncement is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. The Company is currently in the process of evaluating the effects of the new guidance but does not expect the impact from this standard to be material. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
Revenue Recognition	The Company enters into contracts that may include various product and service offerings, which are generally capable of being distinct and are accounted for as separate performance obligations. Revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or service
Fair Value	We measure our financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability in the principal market or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. The Company’s financial assets measured at fair value are as follows (in thousands): June 30, 2019 December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 335,320 $ 335,320 $ — $ 147,221 $ 147,221 $ — Money market funds 40,189 40,189 — 8,343 8,343 — Restricted cash 868 868 — — — — Short-term investments: Corporate bonds and commercial paper 5,992 — 5,992 37,151 — 37,151 U.S. government securities 4,995 — 4,995 4,995 — 4,995 Total assets measured and recorded at fair value $ 387,364 $ 376,377 $ 10,987 $ 197,710 $ 155,564 $ 42,146 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. The Company considers all highly liquid investments purchased with an original or remaining maturity of less than three months at the date of purchase to be cash equivalents. The Company measured money market funds of $40.2 million and $8.3 million as cash equivalents as of June 30, 2019 and December 31, 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 use Level 3 inputs to measure any assets or liabilities as of June 30, 2019 and December 31, 2018.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 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: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Customer B * * 10 % * Customer C 14 % 17 % 13 % 17 %
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 June 30, 2019 December 31, 2018 Customer D 11 % 11 % * Less than 10%

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue From Contract With Customer [Abstract]
Schedule of Contract Balances	Contract balances include the following (in thousands): As of June 30, 2019 December 31, 2018 Accounts receivable, net $ 204,037 $ 183,078 Contract assets (included in Prepaid expenses and other current assets) 2,016 753 Deferred revenue, current 36,536 45,442 Deferred revenue, non-current 13,889 19,594 Total deferred revenue $ 50,425 $ 65,036

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract]
Schedule of Accounts Receivable, Net of Allowances	Accounts receivable, net of allowances, consisted of the following (in thousands): June 30, 2019 December 31, 2018 Gross accounts receivable $ 218,296 $ 204,975 Allowance for sales returns (5,250 ) (7,335 ) Allowance for sales incentives (8,583 ) (13,750 ) Other allowances (426 ) (812 ) Total allowances (14,259 ) (21,897 ) Total Accounts Receivable—net of allowances $ 204,037 $ 183,078
Schedule of Allowance for Sales Returns	Allowance for sales returns consisted of the following activities (in thousands): June 30, 2019 December 31, 2018 Beginning balance $ (7,335 ) $ (6,907 ) Charged to revenue (6,728 ) (17,396 ) Utilization of sales return reserve 8,813 16,968 Ending balance $ (5,250 ) $ (7,335 )
Schedule of Allowance for Sales Incentives	Allowance for sales incentives consisted of the following activities (in thousands): June 30, 2019 December 31, 2018 Beginning balance $ (13,750 ) $ (10,442 ) Charged to revenue (16,663 ) (50,958 ) Utilization of sales incentive reserve 21,830 47,650 Ending balance $ (8,583 ) $ (13,750 )
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): June 30, 2019 December 31, 2018 Computers and equipment $ 19,981 $ 16,056 Leasehold improvements 39,293 18,396 Website and internal-use software 6,507 6,423 Office equipment and furniture 7,645 4,069 Total property and equipment 73,426 44,944 Accumulated depreciation and amortization (25,024 ) (19,680 ) Property and Equipment, net $ 48,402 $ 25,264
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities consisted of the following (in thousands): June 30, 2019 December 31, 2018 Accounts payable $ 62,002 $ 56,576 Accrued royalty expense 8,294 7,939 Accrued inventory 8,392 6,008 Accrued payroll and related expenses 14,816 12,217 Accrued cost of revenue 26,191 22,830 Payments due to content publishers 47,630 32,463 Operating lease liability, current 15,946 — Customer prepayments 5,069 3,124 Taxes and related liabilities 840 1,314 Accrued legal fees 2,845 — Other accrued expenses 9,707 6,091 Total Accounts Payable and Accrued Liabilities $ 201,732 $ 148,562
Schedule of Deferred Revenue	Deferred revenue consisted of the following (in thousands): June 30, 2019 December 31, 2018 Platform, current $ 17,873 $ 28,569 Player, current 18,663 16,873 Total deferred revenue, current 36,536 45,442 Platform, non-current 7,192 12,783 Player, non-current 6,697 6,811 Total deferred revenue, non-current 13,889 19,594 Total Deferred Revenue $ 50,425 $ 65,036

Short-Term Investments (Tables)

Short-Term Investments (Tables)	6 Months Ended
	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Summary of Short-term Investments	The following is a summary of the Company’s short-term investments (in thousands): June 30, 2019 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Corporate bonds and commercial paper $ 5,989 $ 3 $ - $ 5,992 $ 37,168 $ — $ (17 ) $ 37,151 U.S. government securities 4,994 1 — 4,995 4,995 — — 4,995 Total Short-Term Investments $ 10,983 $ 4 $ - $ 10,987 $ 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): June 30, 2019 December 31, 2018 Amortized Cost Fair Value Amortized Cost Fair Value Less than 1 year $ 10,983 $ 10,987 $ 42,163 $ 42,146 Due in 1-3 years — — — Total Short-Term Investments $ 10,983 $ 10,987 $ 42,163 $ 42,146

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 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): June 30, 2019 December 31, 2018 Fair Value Level 1 Level 2 Fair Value Level 1 Level 2 Assets: Cash and cash equivalents: Cash $ 335,320 $ 335,320 $ — $ 147,221 $ 147,221 $ — Money market funds 40,189 40,189 — 8,343 8,343 — Restricted cash 868 868 — — — — Short-term investments: Corporate bonds and commercial paper 5,992 — 5,992 37,151 — 37,151 U.S. government securities 4,995 — 4,995 4,995 — 4,995 Total assets measured and recorded at fair value $ 387,364 $ 376,377 $ 10,987 $ 197,710 $ 155,564 $ 42,146

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Schedule of Components of Lease Expense	The components of lease expense are as follows (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Operating lease cost $ 5,830 $ 10,162 Sublease income (546 ) (1,126 ) Net operating lease cost $ 5,284 $ 9,036
Schedule of Supplemental Cash Flow Information Related To Leases	Supplemental cash flow information related to leases is as follows (in thousands): Six Months Ended June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 7,440 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 83,780
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 June 30, 2019 Operating lease right-of-use assets $ 115,961 Included in accounts payable and accrued liabilities: Operating lease liability, current 15,946 Operating lease liability, non-current 105,513 Total operating lease liability $ 121,459 Weighted Average Remaining Lease Term Operating leases (in years) 9.14 Weighted Average Discount Rate Operating leases 5.51 %
Schedule of Future Lease Payments under Operating Leases	Future lease payments under operating leases as of June 30, 2019 were as follows (in thousands): Year ending December 31, Operating Leases 2019 (remaining 6 months) $ 9,753 2020 19,304 2021 21,946 2022 18,107 2023 18,448 Thereafter 97,240 Total future lease payments 184,798 Less: imputed interest (39,960 ) Less: expected tenant improvement allowance (23,379 ) Total $ 121,459
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

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Schedule of Reserved Shares of Common Stock for Future Issuances	The Company has reserved the following shares of common stock for future issuances (in thousands): As of June 30, 2019 Common stock awards granted under equity incentive plans 16,595 Common stock awards available for issuance under Employee Stock Purchase Plan 2,089 Common stock awards available for issuance under the 2017 Equity Incentive Plan 18,190 Total reserved shares of common stock 36,874
Summary of Stock-based Compensation Expense	The following table shows total stock-based compensation expense for the three and six months ended June 30, 2019 and 2018 (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Cost of platform revenue $ 59 $ 19 $ 118 $ 38 Cost of player revenue 246 67 489 111 Research and development 9,258 2,801 17,790 5,097 Sales and marketing 4,974 1,286 10,140 2,396 General and administrative 4,134 1,136 7,998 2,096 Total stock-based compensation $ 18,671 $ 5,309 $ 36,535 $ 9,738
Schedule of Stock Option Activity	The summary of the Company’s stock option activity is as follows (in thousands, except price 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 - outstanding 16,371 $ 8.59 — Granted 26 80.25 — $ 28.95 Exercised (3,625 ) 5.37 — — Forfeited and expired (339 ) 8.39 — — Balance, June 30, 2019 - outstanding 12,433 $ 9.68 6.5 — $ 1,005,879 Options exercisable at June 30, 2019 6,860 $ 5.12 5.2 — $ 586,269
Summary of Assumptions Used to Value Stock-Based Awards Granted	The fair value of options granted under the equity incentive plans is estimated on the grant date using the Black-Scholes option-valuation model. The assumptions used in the Black-Scholes model are as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Dividend rate — — — — Expected term (in years) 5.0 - 5.27 5.3 - 6.1 5.0 - 5.27 5.3 - 6.1 Risk-free interest rate 1.83 - 2.31% 2.61 - 2.88% 1.83 - 2.56% 2.32 - 2.88% Expected volatility 36 % 38 - 39% 36 % 38 - 40%
Summary of Restricted Stock Unit Activity	Pursuant to the 2017 Plan, the Company grants restricted stock units to employees. The fair value of restricted stock units is based on the Company’s closing stock price on the date of grant. The summary of the Company’s restricted stock unit activity is as follows (in thousands, except price per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Balance, December 31, 2018 - outstanding 3,686 $ 48.50 Awarded 1,081 57.36 Released (381 ) 46.16 Forfeited (224 ) 53.46 Balance, June 30, 2019 - outstanding 4,162 $ 50.75

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Summary of Calculation of Basic and Diluted Net Income (Loss) Per Share	The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share data): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Numerator: Net income (loss) $ (9,333 ) $ 526 $ (19,065 ) $ (6,108 ) Denominator: Weighted-average shares used in computing net income (loss) per share, basic and diluted 114,572 102,652 112,734 101,079 Net income (loss) per share, basic and diluted $ (0.08 ) $ 0.01 $ (0.17 ) $ (0.06 ) Weighted-average shares used in computing net income (loss) per share, diluted 114,572 121,698 112,734 101,079 Net income (loss) per share, diluted $ (0.08 ) $ 0.00 $ (0.17 ) $ (0.06 )
Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss Per Share	Common shares that would be excluded from the calculation of diluted net loss per share because of their anti-dilutive effect are as follows (in thousands): Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Equity awards to purchase common stock 16,595 1,062 16,595 21,485 Unvested shares of common stock issued upon early exercise of stock options and business acquisition 45 — 45 105 Total 16,640 1,062 16,640 21,590

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule of Customer Accounting for 10% or More of Segment Revenue	Customers accounting for 10% or more of segment revenue were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2018 June 30, 2019 June 30, 2018 Platform segment revenue Customer D * * 10 % * Customer G * * * 10 % Player segment revenue Customer A 14 % 16 % 16 % 14 % Customer B 17 % 10 % 19 % 14 % Customer C 40 % 39 % 38 % 38 % * Less than 10% of segment revenue

The Company - Additional Inform

The Company - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Conversion date	Feb. 1, 2008
Number of reportable segments operates	2

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Accounting Policies [Abstract]
Unrealized gains (loss) on short-term investments		$ 3,000	$ 0	$ 21,000	$ 0
Restricted cash		868,000		868,000		$ 0
Operating lease right-of-use assets	$ 39,900,000	115,961,000		115,961,000
Operating lease liability	42,100,000	$ 121,459,000		$ 121,459,000
Reclassification of deferred and prepaid rents to right of use assets	$ 2,200,000

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedules of Customer Concentration by Risk Factor (Details) - Customer Concentration Risk	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Net Revenue | Customer B
Concentration Risk [Line Items]
Concentration risk			10.00%
Net Revenue | Customer C
Concentration Risk [Line Items]
Concentration risk	14.00%	17.00%	13.00%	17.00%
Accounts Receivable | Customer D
Concentration Risk [Line Items]
Concentration risk			11.00%		11.00%

Revenue - Additional Informatio

Revenue - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)segment	Jun. 30, 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	$ 0
Number of reportable segment | segment		2
Estimated contracted revenue	105,200,000	$ 105,200,000
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 $105.2 million as of June 30, 2019 of which we expect to recognize approximately 81% over the next 12 months and the remainder thereafter.
Revenue remaining performance obligation percentage of revenue expected to be recognized		81.00%
Revenue recognized performance obligation	$ 5,300,000	$ 5,300,000
Contract with customer assets increase (decrease)		1,300,000
Decrease in deferred revenue		(14,611,000)	$ (3,387,000)
Deferred revenue increase decrease due to revenue recognized upon customer acceptance		$ 5,000,000

Revenue - Schedule of Contract

Revenue - Schedule of Contract Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Contract Balances [Line Items]
Accounts receivable, net	$ 204,037	$ 183,078
Deferred revenue, current	36,536	45,442
Deferred revenue, non-current	13,889	19,594
Total deferred revenue	50,425	65,036
Prepaid Expenses and Other Current Assets
Schedule Of Contract Balances [Line Items]
Contract assets (included in Prepaid expenses and other current assets)	$ 2,016	$ 753

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Accounts Receivable, Net of Allowances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]
Gross accounts receivable	$ 218,296	$ 204,975
Allowance for accounts receivable	(14,259)	(21,897)
Total Accounts Receivable—net of allowances	204,037	183,078
Allowance for Sales Returns
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	(5,250)	(7,335)	$ (6,907)
Allowance for Sales Incentives
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	(8,583)	(13,750)	$ (10,442)
Other Allowances
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for accounts receivable	$ (426)	$ (812)

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Allowance for Sales Returns (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (21,897)
Ending balance	(14,259)	$ (21,897)
Allowance for Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	(7,335)	(6,907)
Charged to revenue	(6,728)	(17,396)
Utilization of sales return/incentive reserve	8,813	16,968
Ending balance	$ (5,250)	$ (7,335)

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Allowance for Sales Incentives (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ (21,897)
Ending balance	(14,259)	$ (21,897)
Allowance for Sales Incentives
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	(13,750)	(10,442)
Charged to revenue	(16,663)	(50,958)
Utilization of sales return/incentive reserve	21,830	47,650
Ending balance	$ (8,583)	$ (13,750)

Balance Sheet Components - Sc_4

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment	$ 73,426	$ 44,944
Accumulated depreciation and amortization	(25,024)	(19,680)
Property and Equipment, net	48,402	25,264
Computer and Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	19,981	16,056
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	39,293	18,396
Website and Internal-Use Software
Property Plant And Equipment [Line Items]
Total property and equipment	6,507	6,423
Office Equipment and Furniture
Property Plant And Equipment [Line Items]
Total property and equipment	$ 7,645	$ 4,069

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Depreciation and amortization	$ 2.7	$ 1.8	$ 5.4	$ 3.3

Balance Sheet Components - Sc_5

Balance Sheet Components - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts Payable And Accrued Liabilities Current [Abstract]
Accounts payable	$ 62,002	$ 56,576
Accrued royalty expense	8,294	7,939
Accrued inventory	8,392	6,008
Accrued payroll and related expenses	14,816	12,217
Accrued cost of revenue	26,191	22,830
Payments due to content publishers	47,630	32,463
Operating lease liability, current	15,946
Customer prepayments	5,069	3,124
Taxes and related liabilities	840	1,314
Accrued legal fees	2,845
Other accrued expenses	9,707	6,091
Total Accounts Payable and Accrued Liabilities	$ 201,732	$ 148,562

Balance Sheet Components - Sc_6

Balance Sheet Components - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	$ 36,536	$ 45,442
Deferred revenue, non-current	13,889	19,594
Total deferred revenue	50,425	65,036
Platform
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	17,873	28,569
Deferred revenue, non-current	7,192	12,783
Player
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current	18,663	16,873
Deferred revenue, non-current	$ 6,697	$ 6,811

Short-Term Investments - Summar

Short-Term Investments - Summary of Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 10,983	$ 42,163
Gross Unrealized Gains	4
Gross Unrealized Loss		(17)
Fair Value	10,987	42,146
Corporate Bonds and Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,989	37,168
Gross Unrealized Gains	3
Gross Unrealized Loss		(17)
Fair Value	5,992	37,151
U.S. Government Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,994	4,995
Gross Unrealized Gains	1
Fair Value	$ 4,995	$ 4,995

Short-Term Investments - Summ_2

Short-Term Investments - Summary of Maturities of Short-term Investments by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Less than 1 year, amortized cost	$ 10,983	$ 42,163
Amortized Cost	10,983	42,163
Less than 1 year, fair value	10,987	42,146
Total short-term investments, fair value	$ 10,987	$ 42,146

Fair Value - Schedule of Financ

Fair Value - Schedule of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Restricted cash	$ 868	$ 0
Fair Value	10,987	42,146
Total assets measured and recorded at fair value	387,364	197,710
Level 1
Assets:
Restricted cash	868
Total assets measured and recorded at fair value	376,377	155,564
Level 2
Assets:
Total assets measured and recorded at fair value	10,987	42,146
Cash
Assets:
Cash and cash equivalents	335,320	147,221
Cash | Level 1
Assets:
Cash and cash equivalents	335,320	147,221
Money Market Fund
Assets:
Cash and cash equivalents	40,189	8,343
Money Market Fund | Level 1
Assets:
Cash and cash equivalents	40,189	8,343
Corporate Bonds and Commercial Paper
Assets:
Fair Value	5,992	37,151
Corporate Bonds and Commercial Paper | Level 2
Assets:
Fair Value	5,992	37,151
U.S. Government Securities
Assets:
Fair Value	4,995	4,995
U.S. Government Securities | Level 2
Assets:
Fair Value	$ 4,995	$ 4,995

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Money Market Fund | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 40.2	$ 8.3

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Line Items]
Lessee, operating lease, existence of option to extend	true
Lease renewal term, operating lease	7 years
Lessee, operating lease, existence of option to terminate	true
Operating leases, options to terminate leases term	3 years 6 months
Sub lease expiration year	2020
Additional leases, primarily for corporate offices, that have not yet commenced	$ 153.8
Minimum
Leases [Line Items]
Remaining lease term, operating lease	1 year
Additional operating leases that have not yet commenced, lease terms	6 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) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 5,830	$ 10,162
Sublease income	(546)	(1,126)
Net operating lease cost	$ 5,284	$ 9,036

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Cash Flow Information Related to Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 7,440
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 83,780

Leases - Schedule of Suppleme_2

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 115,961	$ 39,900
Operating lease liability, current	15,946
Operating lease liability, non-current	105,513
Total operating lease liability	$ 121,459	$ 42,100
Weighted Average Remaining Lease Term
Operating leases (in years)	9 years 1 month 20 days
Weighted Average Discount Rate
Operating leases	5.51%

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Payments under Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
2019 (remaining 6 months)	$ 9,753
2020	19,304
2021	21,946
2022	18,107
2023	18,448
Thereafter	97,240
Total future lease payments	184,798
Less: imputed interest	(39,960)
Less: expected tenant improvement allowance	(23,379)
Total	$ 121,459	$ 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 - Additional Information (

Debt - Additional Information (Details) - USD ($)	Feb. 19, 2019	Jun. 30, 2017	Jun. 30, 2019	May 03, 2019	Dec. 31, 2018	Jul. 18, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Outstanding debt			$ 0		$ 0
Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 50,000,000
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
Debt Instrument [Line Items]
Adjusted quick ratio			1.00%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Term Loan A Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100,000,000
Debt instrument term, years	4 years
Debt instrument, amortization description	Loans under the Term Loan A Facility will amortize in equal quarterly installments beginning on the last day of the fiscal quarter ending after the date of the initial borrowing under the Term Loan A Facility, 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 and (ii) thereafter, 2.50% of the drawn principal amount of the Term Loan Facility, with any remaining balance payable on the maturity date of the Term Loan A Facility.
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%
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%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100,000,000
Debt instrument term, years	4 years
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility | Term Loan A Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000,000
Interest payments description	Loans under the Credit Facility bear interest at a rate equal to, at the Company’s election, (i) an alternate base rate, based upon the highest of (x) the prime rate published by the Wall Street Journal, (y) the federal funds effective date plus ½ of 1% and (z) the one-month LIBOR plus 1%, in each case plus an applicable margin of up to 1% per annum, with step-downs based on its secured leverage ratio or (2) an adjusted one-, two-, three-, or six month LIBOR, at its election, plus an applicable margin of up to 2% per annum, with step-downs based on its secured leverage ratio.
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility | Term Loan A Facility | Federal Funds Effective Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility | Term Loan A Facility | One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility | Term Loan A Facility | Maximum
Debt Instrument [Line Items]
Applicable margin with step-downs based on secured leverage ratio	1.00%
Morgan Stanley Senior Funding, Inc | Credit Agreement | Revolving Credit Facility | Term Loan A Facility | Maximum | Adjusted One-, Two-, Three-, or Six Month LIBOR
Debt Instrument [Line Items]
Applicable margin with step-downs based on secured leverage ratio	2.00%
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

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, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	May 16, 2019	Mar. 12, 2019
Class Of Stock [Line Items]
Maximum aggregate offering price of common stock				$ 100
Gross proceeds from issuance of common stock	$ 100	$ 82.9
Number of shares Issued	1.4	1
Average selling price per share	$ 72	$ 82.90
Stock Issuance Costs	$ 2	$ 1.6
Maximum aggregate offering shares of common stock			1

Stockholders' Equity - Preferre

Stockholders' Equity - Preferred Stock - Additional Information (Details) - shares	Jun. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Preferred stock, shares authorized	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)	6 Months Ended
	Jun. 30, 2019Class
Equity [Abstract]
Number of classes	2

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Future Issuances (Details) shares in Thousands	Jun. 30, 2019shares
Class Of Stock [Line Items]
Total reserved shares of common stock	36,874
Equity Incentive Plan
Class Of Stock [Line Items]
Common stock awards granted under equity incentive plans	16,595
Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock awards available for issuance	2,089
2017 Plan
Class Of Stock [Line Items]
Common stock awards available for issuance	18,190

Stockholders' Equity - Equity I

Stockholders' Equity - Equity Incentive Plans - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019
2008 Plan
Class Of Stock [Line Items]
Stock option vesting period	4 years
Stock options expiration term	10 years
2017 Plan
Class Of Stock [Line Items]
Stock option vesting period	4 years
Stock options expiration term	10 years

Stockholders' Equity - Schedu_2

Stockholders' Equity - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 18,671	$ 5,309	$ 36,535	$ 9,738
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,258	2,801	17,790	5,097
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,974	1,286	10,140	2,396
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,134	1,136	7,998	2,096
Player | Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	246	67	489	111
Platform | Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 59	$ 19	$ 118	$ 38

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Balance, Number of Shares | shares	16,371
Granted, Number of Shares | shares	26
Exercised, Number of Shares | shares	(3,625)
Forfeited and expired, Number of Shares | shares	(339)
Balance, Number of Shares | shares	12,433
Options exercisable at June 30, 2019, Number of Shares | shares	6,860
Balance, Weighted Average Exercise Price	$ 8.59
Granted, Weighted Average Exercise Price	80.25
Exercised, Weighted Average Exercise Price	5.37
Forfeited and expired, Weighted Average Exercise Price	8.39
Balance, Weighted Average Exercise Price	9.68
Options exercisable at June 30, 2019, Weighted Average Exercise Price	$ 5.12
Balance, Weighted Average Remaining Contractual Life	6 years 6 months
Options exercisable at June 30, 2019, Weighted Average Remaining Contractual Life	5 years 2 months 12 days
Granted, Weighted Average Grant Date Fair Value Per Share	$ 28.95
Outstanding, ending balance | $	$ 1,005,879
Options exercisable, ending balance | $	$ 586,269

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Option Plan - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic value of options exercised	$ 135.8	$ 140.8	$ 245.5	$ 197
Unrecognized stock compensation expense	$ 29.8		$ 29.8
Expected weighted average period to recognize unrecognized stock compensation expense			1 year 10 months 24 days

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Assumptions Used to Value Stock-Based Awards Granted (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Risk-free interest rate, Minimum	1.83%	2.61%	1.83%	2.32%
Risk-free interest rate, Maximum	2.31%	2.88%	2.56%	2.88%
Expected volatility	36.00%		36.00%
Expected volatility, Minimum		38.00%		38.00%
Expected volatility, Maximum		39.00%		40.00%
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	5 years 3 months 18 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Expected term (in years)	5 years 3 months 7 days	6 years 1 month 6 days	5 years 3 months 7 days	6 years 1 month 6 days

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units shares in Thousands	6 Months Ended
	Jun. 30, 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	1,081
Number of Shares, Released | shares	(381)
Number of Shares, Forfeited | shares	(224)
Ending balance, Number of Shares outstanding | shares	4,162
Weighted Average Grant Date Fair Value Per Share, Beginning balance | $ / shares	$ 48.50
Weighted Average Grant Date Fair Value Per Share, Awarded | $ / shares	57.36
Weighted Average Grant Date Fair Value Per Share, Released | $ / shares	46.16
Weighted Average Grant Date Fair Value Per Share, Forfeited | $ / shares	53.46
Weighted Average Grant Date Fair Value Per Share, Ending balance | $ / shares	$ 50.75

Stockholders' Equity - Restrict

Stockholders' Equity - Restricted Stock Units - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unrecognized stock compensation expense	$ 29.8		$ 29.8
Expected weighted average period to recognize unrecognized stock compensation expense			1 year 10 months 24 days
Restricted Stock Units
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unrecognized stock compensation expense	189.1		$ 189.1
Expected weighted average period to recognize unrecognized stock compensation expense			3 years
Intrinsic value of restricted stock units vested during the period	$ 19.4	$ 0.3	$ 30.8	$ 0.3

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 31.3	$ 31.3
Letters of credit expiration date	Dec. 31, 2030
Manufacturing
Commitments And Contingencies [Line Items]
Purchase commitments for inventory, content licensing, advertising buys and other platform services	$ 52.8
Loss on purchase obligation for inventory	0.4	$ 0.1
Content Providers and Other Vendors
Commitments And Contingencies [Line Items]
Purchase commitments for inventory, content licensing, advertising buys and other platform services	$ 75.9

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income tax benefit	$ 384	$ 354	$ 523	$ 225

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Details) - Strategic Investors - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Revenue from related parties	$ 2	$ 0.7	$ 4.6	$ 1.7
Receivable from related parties	3.1		3.1		$ 2.4
Related party transaction expense	0.6	$ 0.2	1.1	$ 0.2
Payable/ outstanding to related parties	$ 0.5		$ 0.5		$ 1.5

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Calculation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss)	$ (9,333)	$ 526	$ (19,065)	$ (6,108)
Denominator:
Weighted-average shares used in computing net income (loss) per share, basic and diluted	114,572	102,652	112,734	101,079
Net income (loss) per share, basic and diluted	$ (0.08)	$ 0.01	$ (0.17)	$ (0.06)
Weighted-average shares used in computing net income (loss) per share, diluted	114,572	121,698	112,734	101,079
Net income (loss) per share, diluted	$ (0.08)	$ 0	$ (0.17)	$ (0.06)

Net Income (Loss) Per Share -_2

Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of diluted net loss per share	16,640	1,062	16,640	21,590
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	16,595	1,062	16,595	21,485
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	45		45	105

Segment Information - Additiona

Segment Information - Additional Information (Details) - segment	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 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%	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	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
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%	17.00%	13.00%	17.00%
Platform | Customer D
Entity Wide Revenue Major Customer [Line Items]
Concentration risk			10.00%
Platform | Customer G
Entity Wide Revenue Major Customer [Line Items]
Concentration risk				10.00%
Player | Customer A
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	14.00%	16.00%	16.00%	14.00%
Player | Customer B
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	17.00%	10.00%	19.00%	14.00%
Player | Customer C
Entity Wide Revenue Major Customer [Line Items]
Concentration risk	40.00%	39.00%	38.00%	38.00%