Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Revenue:
Total net revenue	$ 173,381	$ 124,782	$ 466,767	$ 324,502
Cost of Revenue:
Total cost of revenue	94,388	74,887	246,910	198,130
Gross Profit:
Total gross profit	78,993	49,895	219,857	126,372
Operating Expenses:
Research and development	45,370	28,532	119,692	76,650
Sales and marketing	25,603	16,216	68,180	44,938
General and administrative	19,769	13,039	50,768	33,894
Total operating expenses	90,742	57,787	238,640	155,482
Loss from Operations	(11,749)	(7,892)	(18,783)	(29,110)
Other Income (Expense), Net:
Interest expense	(112)	(815)	(220)	(1,286)
Change in fair value of preferred stock warrant liability		(37,682)		(40,333)
Other income, net	2,162	212	2,971	423
Total other income (expense), net	2,050	(38,285)	2,751	(41,196)
Loss Before Income Taxes	(9,699)	(46,177)	(16,032)	(70,306)
Income tax expense (benefit)	(172)	58	(397)	144
Net Loss Attributable to Common Stockholders	$ (9,527)	$ (46,235)	$ (15,635)	$ (70,450)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.09)	$ (8.79)	$ (0.15)	$ (14.09)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	106,884	5,260	103,035	4,999
Player | Goods
Net Revenue:
Total net revenue	$ 73,331	$ 67,254	$ 201,299	$ 184,583
Cost of Revenue:
Total cost of revenue	64,884	61,925	168,412	165,047
Gross Profit:
Total gross profit	8,447	5,329	32,887	19,536
Platform | Services
Net Revenue:
Total net revenue	100,050	57,528	265,468	139,919
Cost of Revenue:
Total cost of revenue	29,504	12,962	78,498	33,083
Gross Profit:
Total gross profit	$ 70,546	$ 44,566	$ 186,970	$ 106,836