Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Revenue:
Total net revenue	$ 156,810	$ 99,627	$ 293,386	$ 199,720
Cost of Revenue:
Total cost of revenue	79,058	61,990	152,522	123,243
Gross Profit:
Total gross profit	77,752	37,637	140,864	76,477
Operating Expenses:
Research and development	40,196	25,776	74,322	48,118
Sales and marketing	22,259	14,667	42,577	28,722
General and administrative	15,429	10,577	30,999	20,855
Total operating expenses	77,884	51,020	147,898	97,695
Loss from Operations	(132)	(13,383)	(7,034)	(21,218)
Other Income (Expense), Net:
Interest expense	(57)	(304)	(108)	(471)
Change in fair value of preferred stock warrant liability		(1,916)		(2,651)
Other income, net	361	128	809	211
Total other income (expense), net	304	(2,092)	701	(2,911)
Income (Loss) Before Income Taxes	172	(15,475)	(6,333)	(24,129)
Income tax expense (benefit)	(354)	38	(225)	86
Net Income (Loss) Attributable to Common Stockholders	$ 526	$ (15,513)	$ (6,108)	$ (24,215)
Net income (loss) per share attributable to common stockholders—basic	$ 0.01	$ (3.18)	$ (0.06)	$ (4.98)
Net income (loss) per share attributable to common stockholders—diluted	$ 0.00	$ (3.18)	$ (0.06)	$ (4.98)
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders—basic	102,652	4,882	101,079	4,866
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders—diluted	121,698	4,882	101,079	4,866
Player | Goods
Net Revenue:
Total net revenue	$ 66,469	$ 53,651	$ 127,968	$ 117,329
Cost of Revenue:
Total cost of revenue	51,730	50,212	103,528	103,122
Gross Profit:
Total gross profit	14,739	3,439	24,440	14,207
Platform | Services
Net Revenue:
Total net revenue	90,341	45,976	165,418	82,391
Cost of Revenue:
Total cost of revenue	27,328	11,778	48,994	20,121
Gross Profit:
Total gross profit	$ 63,013	$ 34,198	$ 116,424	$ 62,270