Condensed 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	$ 39,426	$ 33,314	$ 112,860	$ 94,995
Professional services	7,570	7,313	23,292	21,254
Total revenue	46,996	40,627	136,152	116,249
Cost of revenue
Subscription	7,167	6,921	22,269	19,960
Professional services	6,763	7,068	21,599	19,780
Total cost of revenue	13,930	13,989	43,868	39,740
Gross profit	33,066	26,638	92,284	76,509
Operating expenses
Research and development	10,139	9,015	30,060	26,072
Sales and marketing	20,863	18,300	60,983	54,256
General and administrative	7,188	6,285	20,342	16,969
Total operating expenses	38,190	33,600	111,385	97,297
Loss from operations	(5,124)	(6,962)	(19,101)	(20,788)
Other income (expense)
Interest income (expense) and other, net	311	(1,312)	811	(1,746)
Foreign exchange gain (loss)	105	(367)	173	(774)
Loss before provision for income taxes	(4,708)	(8,641)	(18,117)	(23,308)
Provision for income taxes	(463)	(114)	(614)	(328)
Net loss	$ (5,171)	$ (8,755)	$ (18,731)	$ (23,636)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.13)	$ (0.63)	$ (0.48)	$ (1.78)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	40,120	13,884	39,240	13,307