Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Online game	$ 547,291	$ 590,755	$ 537,619
Advertising and other	194,129	173,962	152,791
Total revenue	741,420	764,717	690,410
Costs and expenses:
Cost of revenue	238,546	235,985	213,570
Research and development	320,300	361,931	396,553
Sales and marketing	183,637	169,573	157,364
General and administrative	92,509	143,284	167,664
Impairment of intangible assets	20,677
Total costs and expenses	855,669	910,773	935,151
Income (loss) from operations	(114,249)	(146,056)	(244,741)
Interest income	3,057	2,568	3,266
Other income (expense), net	6,461	13,306	8,248
Income (loss) before income taxes	(104,731)	(130,182)	(233,227)
Provision for (benefit from) income taxes	3,442	(8,672)	(7,327)
Net income (loss)	$ (108,173)	$ (121,510)	$ (225,900)
Net income (loss) per share attributable to common stockholders
Basic	$ (0.12)	$ (0.13)	$ (0.26)
Diluted	$ (0.12)	$ (0.13)	$ (0.26)
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic	878,827	913,511	874,509
Diluted	878,827	913,511	874,509