Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Revenue:
Total net revenue	$ 742,506	$ 512,763	$ 398,649
Cost of Revenue:
Total cost of revenue	410,358	312,930	277,604
Gross Profit:
Total gross profit	332,148	199,833	121,045
Operating Expenses:
Research and development	170,692	107,945	76,177
Sales and marketing	102,780	64,069	52,888
General and administrative	71,972	47,435	35,341
Total operating expenses	345,444	219,449	164,406
Loss from Operations	(13,296)	(19,616)	(43,361)
Other Income (Expense), Net:
Interest expense	(346)	(1,612)	146
Loss on extinguishment of debt		(2,338)
Change in fair value of preferred stock warrant liability		(40,333)	888
Other income (expense), net	4,309	705	(220)
Total other income (expense), net	3,963	(43,578)	814
Loss Before Income Taxes	(9,333)	(63,194)	(42,547)
Income tax (benefit) expense	(476)	315	211
Net Loss Attributable to Common Stockholders	$ (8,857)	$ (63,509)	$ (42,758)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.08)	$ (2.24)	$ (9.01)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	104,618	28,308	4,746
Player | Goods
Net Revenue:
Total net revenue	$ 325,643	$ 287,407	$ 293,929
Cost of Revenue:
Total cost of revenue	289,815	258,104	249,821
Gross Profit:
Total gross profit	35,828	29,303	44,108
Platform | Services
Net Revenue:
Total net revenue	416,863	225,356	104,720
Cost of Revenue:
Total cost of revenue	120,543	54,826	27,783
Gross Profit:
Total gross profit	$ 296,320	$ 170,530	$ 76,937