CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	[1]
Income Statement [Abstract]
Revenue		$ 129,791	$ 93,888
Cost of revenue	[2]	39,056	28,107
Gross profit		90,735	65,781
Operating expenses:
Research and development	[2]	37,085	26,456
Sales and marketing	[2]	65,058	46,269
General and administrative	[2]	22,207	18,317
Total operating expenses	[2]	124,350	91,042
Operating loss		(33,615)	(25,261)
Other income, net		1,000	218
Loss before provision for (benefit from) income taxes		(32,615)	(25,043)
Provision for (benefit from) income taxes		(3,290)	38
Net loss		$ (29,325)	$ (25,081)	[3],[4]
Net loss per share, basic and diluted (usd per share)		$ (0.28)	$ (0.26)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)		103,692	97,475

[1] See Note 1 for a summary of adjustments.

[2] Includes share-based compensation expense as follows: Three Months EndedMarch 31,2018 2017 * As adjustedCost of revenue$3,098 $2,104Research and development10,231 6,914Sales and marketing8,007 5,524General and administrative5,652 4,562

[3] See Note 1 for a summary of adjustments.

[4] See Note 1 for a summary of adjustments.