Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Total revenue	$ 563,309	$ 437,633	$ 1,555,643	$ 1,178,319
Cost of revenue:
Total cost of revenue	201,726	157,016	557,258	423,715
Gross profit	361,583	280,617	998,385	754,604
Operating expenses:
Research and development	117,589	79,610	324,029	242,414
Sales and marketing	47,903	40,640	136,231	116,297
General and administrative	15,321	19,535	53,420	65,009
Legal settlement (Note 11)	0	0	405,000	0
Total operating expenses	180,813	139,785	918,680	423,720
Income from operations	180,770	140,832	79,705	330,884
Other income (expense), net:
Interest expense	(673)	(701)	(2,040)	(2,039)
Other income (expense), net	9,292	2,136	12,646	4,280
Total other income (expense), net	8,619	1,435	10,606	2,241
Income before income taxes	189,389	142,267	90,311	333,125
Provision for (benefit from) income taxes	20,865	8,545	(67,482)	13,757
Net income	168,524	133,722	157,793	319,368
Net income attributable to common stockholders:
Basic	168,439	133,540	157,706	318,643
Diluted	$ 168,445	$ 133,555	$ 157,713	$ 318,704
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 2.25	$ 1.84	$ 2.12	$ 4.43
Diluted (in dollars per share)	$ 2.08	$ 1.68	$ 1.95	$ 4.06
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	75,011	72,588	74,506	71,903
Diluted (in shares)	81,018	79,322	80,844	78,528
Product
Revenue:
Total revenue	$ 485,481	$ 380,344	$ 1,337,865	$ 1,025,615
Cost of revenue:
Total cost of revenue	187,764	145,874	516,077	390,116
Service
Revenue:
Total revenue	77,828	57,289	217,778	152,704
Cost of revenue:
Total cost of revenue	$ 13,962	$ 11,142	$ 41,181	$ 33,599