Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue	$ 1,321,659	$ 907,208	$ 861,390
Costs and expenses:
Cost of revenue	524,089	304,658	258,971
Research and development	505,889	270,323	256,012
Sales and marketing	464,091	226,524	212,030
General and administrative	99,790	98,941	108,653
Total costs and expenses	1,593,859	900,446	835,666
Income (loss) from operations	(272,200)	6,762	25,724
Interest income	14,039	6,549	5,309
Interest expense	(16,971)	(255)	(22)
Other income (expense), net	322,467	13,407	6,572
Income (loss) before income taxes	47,335	26,463	37,583
Provision for (benefit from) income taxes	5,410	11,006	10,944
Net income (loss)	$ 41,925	$ 15,457	$ 26,639
Net income (loss) per share attributable to common stockholders:
Basic	$ 0.04	$ 0.02	$ 0.03
Diluted	$ 0.04	$ 0.02	$ 0.03
Weighted average common shares used to compute net income (loss) per share attributable to common stockholders:
Basic	938,709	862,460	869,067
Diluted	974,020	889,584	897,165
Online Game [Member]
Revenue:
Total revenue	$ 1,047,237	$ 670,877	$ 665,593
Advertising and Other [Member]
Revenue:
Total revenue	$ 274,422	$ 236,331	$ 195,797