CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue		$ 93,007	$ 68,459
Cost of revenue	[1]	28,107	21,516
Gross profit		64,900	46,943
Operating expenses:
Research and development	[1]	26,456	21,597
Sales and marketing	[1]	47,301	36,172
General and administrative	[1]	18,317	15,861
Total operating expenses	[1]	92,074	73,630
Operating loss		(27,174)	(26,687)
Other income (expense), net		218	(70)
Loss before provision for income taxes		(26,956)	(26,757)
Provision for income taxes		38	414
Net loss		$ (26,994)	$ (27,171)
Net loss per share, basic and diluted (usd per share)		$ (0.28)	$ (0.30)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)		97,475	90,519

[1] (1) Includes share-based compensation expense as follows: Three Months EndedMarch 31,2017 2016Cost of revenue$2,104 $1,633Research and development6,914 6,627Sales and marketing5,633 5,439General and administrative4,562 3,996