Condensed Consolidated Statement of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue
Subscription	$ 33,314	$ 25,594	$ 94,995	$ 72,836
Professional services	7,313	6,660	21,254	21,573
Total revenue	40,627	32,254	116,249	94,409
Cost of revenue
Subscription	6,921	6,173	19,960	17,315
Professional services	7,068	6,684	19,780	19,720
Total cost of revenue	13,989	12,857	39,740	37,035
Gross profit	26,638	19,397	76,509	57,374
Operating expenses
Research and development	9,015	7,928	26,072	22,602
Sales and marketing	18,300	15,855	54,256	49,129
General and administrative	6,285	5,023	16,969	12,721
Total operating expenses	33,600	28,806	97,297	84,452
Loss from operations	(6,962)	(9,409)	(20,788)	(27,078)
Other income (expense)
Interest (expense) income and other, net	(1,312)	(18)	(1,746)	1
Foreign exchange loss	(367)	(351)	(774)	(958)
Loss before provision for income taxes	(8,641)	(9,778)	(23,308)	(28,035)
Provision for income taxes	(114)	(87)	(328)	(236)
Net loss	$ (8,755)	$ (9,865)	$ (23,636)	$ (28,271)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.63)	$ (0.77)	$ (1.78)	$ (2.25)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	13,884	12,754	13,307	12,575