Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Product	$ 254,238	$ 193,339	$ 702,329	$ 527,552
Service	36,023	24,209	98,869	64,593
Total revenue	290,261	217,548	801,198	592,145
Cost of revenue:
Product	94,777	67,990	261,711	182,443
Service	9,064	7,810	26,526	22,310
Total cost of revenue	103,841	75,800	288,237	204,753
Total gross profit	186,420	141,748	512,961	387,392
Operating expenses:
Research and development	70,648	58,748	202,183	152,035
Sales and marketing	33,216	26,508	92,566	77,776
General and administrative	19,535	25,195	52,298	57,670
Total operating expenses	123,399	110,451	347,047	287,481
Income from operations	63,021	31,297	165,914	99,911
Other income (expense), net:
Interest expense	(735)	(753)	(2,218)	(2,406)
Other income (expense), net	639	13	1,392	(38)
Total other income (expense), net	(96)	(740)	(826)	(2,444)
Income before provision for income taxes	62,925	30,557	165,088	97,467
Provision for income taxes	11,668	1,867	39,682	20,289
Net income	51,257	28,690	125,406	77,178
Net income attributable to common stockholders:
Basic	50,962	28,301	124,475	75,864
Diluted	$ 50,980	$ 28,329	$ 124,531	$ 75,967
Net income per share attributable to common stockholders:
Basic (in usd per share)	$ 0.74	$ 0.42	$ 1.82	$ 1.16
Diluted (in usd per share)	$ 0.69	$ 0.39	$ 1.71	$ 1.07
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	69,076	66,629	68,365	65,609
Diluted (in shares)	73,453	71,887	72,811	71,232