Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Online game	$ 175,253	$ 134,254	$ 492,479	$ 407,134
Advertising and other	49,342	48,170	135,631	143,746
Total revenue	224,595	182,424	628,110	550,880
Costs and expenses:
Cost of revenue	65,907	62,675	194,956	175,917
Research and development	60,966	73,913	194,783	227,883
Sales and marketing	53,944	49,802	151,765	136,777
General and administrative	23,826	21,656	69,942	69,414
Impairment of intangible assets		20,677		20,677
Total costs and expenses	204,643	228,723	611,446	630,668
Income (loss) from operations	19,952	(46,299)	16,664	(79,788)
Interest income	1,502	800	3,548	2,266
Other income (expense), net	1,181	980	4,231	4,985
Income (loss) before income taxes	22,635	(44,519)	24,443	(72,537)
Provision for (benefit from) income taxes	4,544	(2,782)	10,733	204
Net income (loss)	$ 18,091	$ (41,737)	$ 13,710	$ (72,741)
Net income (loss) per share attributable to common stockholders:
Basic	$ 0.02	$ (0.05)	$ 0.02	$ (0.08)
Diluted	$ 0.02	$ (0.05)	$ 0.02	$ (0.08)
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic	867,377	882,408	868,707	875,656
Diluted	893,684	882,408	895,207	875,656