Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Subscription and support	$ 37,427	$ 25,814	$ 100,590	$ 68,807
Professional services and other	5,521	4,331	14,381	10,527
Total revenue	42,948	30,145	114,971	79,334
Cost of revenue:
Subscription and support	9,278	6,312	24,350	17,335
Professional services and other	3,192	2,326	8,729	6,287
Total cost of revenue	12,470	8,638	33,079	23,622
Gross profit	30,478	21,507	81,892	55,712
Operating expenses:
Sales and marketing	22,129	17,788	62,429	51,989
Research and development	12,577	9,297	34,816	25,832
General and administrative	8,334	6,689	22,941	18,428
Total operating expenses	43,040	33,774	120,186	96,249
Loss from operations	(12,562)	(12,267)	(38,294)	(40,537)
Other income (expense):
Interest income	84	104	199	236
Interest expense		(31)	(18)	(54)
Change in fair value of warrant liability	(15)	(10)	(98)	52
Other income (expense), net	191	(103)	318	(234)
Total other income (expense), net	260	(40)	401
Loss before income taxes	(12,302)	(12,307)	(37,893)	(40,537)
Income tax expense	(71)	(10)	(207)	(109)
Net loss	$ (12,373)	$ (12,317)	$ (38,100)	$ (40,646)
Net loss per common share, basic and diluted	$ (0.42)	$ (0.44)	$ (1.31)	$ (1.47)
Weighted average common shares used in computing basic and diluted net loss per common share	29,535	28,084	29,120	27,667