Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Products	$ 116,748	$ 89,404	$ 63,407
Maintenance and support	46,268	37,403	26,903
Professional services	37,924	30,630	20,216
Total revenue	200,940	157,437	110,526
Cost of revenue:
Products	25,583	12,447	6,921
Maintenance and support	7,491	7,105	6,002
Professional services	23,836	20,173	16,321
Total cost of revenue	56,910	39,725	29,244
Total gross profit	144,030	117,712	81,282
Operating expenses:
Research and development	50,938	47,955	38,746
Sales and marketing	111,593	90,524	67,365
General and administrative	30,293	28,282	21,731
Total operating expenses	192,824	166,761	127,842
Loss from operations	(48,794)	(49,049)	(46,560)
Other income (expense), net:
Interest income (expense), net	775	131	(2,523)
Other income (expense), net	313	(109)	(278)
Loss before income taxes	(47,706)	(49,027)	(49,361)
Provision for (benefit from) income taxes	(2,236)	(27)	496
Net loss	(45,470)	(49,000)	(49,857)
Accretion of preferred stock to redemption value	0	0	(35,061)
Beneficial conversion charge relating to IPO participation payment	0	0	(14,161)
Net loss attributable to common stockholders	$ (45,470)	$ (49,000)	$ (99,079)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.06)	$ (1.19)	$ (4.00)
Weighted-average common shares outstanding, basic and diluted	42,952,950	41,248,473	24,740,480