Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Products	$ 27,168	$ 21,456	$ 53,110	$ 41,601
Maintenance and support	11,338	8,962	22,140	17,343
Professional services	8,937	6,850	17,438	13,120
Total revenue	47,443	37,268	92,688	72,064
Cost of revenue:
Products	5,557	2,687	10,267	5,285
Maintenance and support	1,850	1,758	3,728	3,439
Professional services	5,672	4,848	11,348	9,281
Total cost of revenue	13,079	9,293	25,343	18,005
Total gross profit	34,364	27,975	67,345	54,059
Operating expenses:
Research and development	11,873	12,932	23,266	25,274
Sales and marketing	27,132	21,680	51,942	44,448
General and administrative	7,256	6,644	14,504	13,237
Total operating expenses	46,261	41,256	89,712	82,959
Loss from operations	(11,897)	(13,281)	(22,367)	(28,900)
Other income (expense), net:
Interest income (expense), net	218	26	387	11
Other income (expense), net	229	(48)	114	148
Loss before income taxes	(11,450)	(13,303)	(21,866)	(28,741)
Provision for income taxes	187	149	316	291
Net loss	$ (11,637)	$ (13,452)	$ (22,182)	$ (29,032)
Net loss per share, basic and diluted (in dollars per share)	$ (0.27)	$ (0.33)	$ (0.52)	$ (0.71)
Weighted-average common shares outstanding, basic and diluted	42,681,287	41,063,613	42,395,450	40,805,641