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