Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$ 1,394,205	$ 985,737	$ 526,016
Cost of revenue	766,970	623,953	298,530
Gross profit	627,235	361,784	227,486
Operating expenses:
Research and development	151,852	73,737	36,115
Sales and marketing	194,377	157,771	116,855
General and administrative	93,971	31,573	20,899
Total operating expenses	440,200	263,081	173,869
Operating income	187,035	98,703	53,617
Other expense, net	(6,060)	(7,374)	(407)
Income before income taxes	180,975	91,329	53,210
Income tax expense	52,887	30,751	20,948
Net income	128,088	60,578	32,262
Less: distributed earnings	0	0	112,209
Less: undistributed earnings allocable to participating securities	(16,512)	(16,727)	0
Undistributed net income (loss) attributable to common stockholders—basic	111,576	43,851	(79,947)
Add: adjustments to net income for dilutive securities allocable to: holders of preferred stock and unvested early exercised options and restricted stock	2,277	2,309	0
Undistributed net income (loss) attributable to common stockholders—diluted	113,853	46,160	(79,947)
Distributed earnings to common stockholders	$ 0	$ 0	$ 84,828
Weighted-average shares used to compute net income per share attributable to common stockholders:
Basic (in shares)	104,453	81,018	74,226
Diluted (in shares)	123,630	98,941	74,226
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 1.07	$ 0.54	$ 0.07
Diluted (in dollars per share)	$ 0.92	$ 0.47	$ 0.07