CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue		$ 68,459	$ 42,234
Cost of revenue	[1]	21,516	14,290
Gross profit		46,943	27,944
Operating expenses:
Research and development	[1]	21,597	13,259
Sales and marketing	[1]	36,172	23,403
General and administrative	[1]	15,861	10,127
Total operating expenses	[1]	73,630	46,789
Operating loss		(26,687)	(18,845)
Other expense, net		(70)	(230)
Loss before provision for income taxes		(26,757)	(19,075)
Provision for income taxes		414	93
Net loss		$ (27,171)	$ (19,168)
Net loss per share, basic and diluted		$ (0.30)	$ (0.25)
Weighted-average shares used to compute net loss per share, basic and diluted		90,519	76,338

[1] Includes share-based compensation expense as follows: