Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 400,340	$ 279,971	$ 1,183,368	$ 760,292
Cost of revenue	213,710	155,932	638,665	436,870
Gross profit	186,630	124,039	544,703	323,422
Operating expenses:
Research and development	67,372	42,376	175,262	105,778
Sales and marketing	66,427	48,109	186,290	133,151
General and administrative	25,195	20,097	87,109	71,146
Total operating expenses	158,994	110,582	448,661	310,075
Operating income	27,636	13,457	96,042	13,347
Other expense, net	(363)	(1,784)	(2,485)	(4,945)
Income before income taxes	27,273	11,673	93,557	8,402
Income tax expense (benefit)	8,474	(2,947)	22,975	2,574
Net income	18,799	14,620	70,582	5,828
Less: net income allocable to participating securities	0	(36)	0	(1,022)
Net income attributable to common stockholders—basic	18,799	14,584	70,582	4,806
Add: net income allocable to dilutive participating securities	0	1	0	10
Net income attributable to common stockholders—diluted	$ 18,799	$ 14,585	$ 70,582	$ 4,816
Net income per share attributable to common stockholders - Basic (in dollars per share)	$ 0.14	$ 0.12	$ 0.53	$ 0.05
Net income per share attributable to common stockholders - Diluted (in dollars per share)	$ 0.13	$ 0.10	$ 0.48	$ 0.04
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares)	135,800	125,713	133,755	96,905
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares)	146,055	145,186	147,201	115,578