Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 155,463	$ 101,625	$ 410,617	$ 246,458
Cost of revenue	54,506	36,589	134,966	85,393
Gross profit	100,957	65,036	275,651	161,065
Operating expenses:
Research and development	36,231	26,635	104,565	67,235
Sales and marketing	20,956	14,523	60,322	37,703
General and administrative	9,896	5,242	24,253	12,484
Total operating expenses	67,083	46,400	189,140	117,422
Income from operations	33,874	18,636	86,511	43,643
Other income (expense), net:
Interest expense—related party	0	(439)	(782)	(1,300)
Interest expense	(764)	(1,358)	(4,730)	(4,020)
Other income (expense), net	(824)	(23)	2,426	(123)
Total other income (expense), net	(1,588)	(1,820)	(3,086)	(5,443)
Income before provision for income taxes	32,286	16,816	83,425	38,200
Provision for income taxes	10,420	4,960	27,612	9,482
Net income	21,866	11,856	55,813	28,718
Net income attributable to common stockholders:
Basic (usd per share)	21,185	5,838	40,556	13,874
Diluted (usd per share)	$ 21,255	$ 6,128	$ 41,909	$ 14,460
Net income per share attributable to common stockholders:
Basic (usd per share)	$ 0.34	$ 0.21	$ 0.93	$ 0.52
Diluted (usd per share)	$ 0.30	$ 0.20	$ 0.85	$ 0.49
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	62,402	27,557	43,453	26,927
Diluted (in shares)	69,737	30,412	49,323	29,241