Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue
Revenue	$ 59,223	$ 46,996	$ 172,338	$ 136,152
Cost of revenue
Cost of revenue	18,073	13,930	54,702	43,868
Gross profit	41,150	33,066	117,636	92,284
Operating expenses
Research and development	12,130	10,139	36,204	30,060
Sales and marketing	23,993	19,792	70,695	60,401
General and administrative	7,905	7,188	25,558	20,342
Total operating expenses	44,028	37,119	132,457	110,803
Loss from operations	(2,878)	(4,053)	(14,821)	(18,519)
Other (expense) income
Interest expense	(1,897)	(1)	(4,021)	(21)
Interest income	1,126	326	2,375	859
Other income (expense), net	109	(14)	81	(27)
Foreign exchange (loss) gain	(335)	93	(797)	159
Loss before income taxes	(3,875)	(3,649)	(17,183)	(17,549)
Provision for income taxes	(695)	(463)	(783)	(614)
Net loss	$ (4,570)	$ (4,112)	$ (17,966)	$ (18,163)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.10)	$ (0.10)	$ (0.41)	$ (0.46)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	44,785	40,120	43,830	39,240
Subscription
Revenue
Revenue	$ 49,610	$ 39,426	$ 144,287	$ 112,860
Cost of revenue
Cost of revenue	9,157	7,167	27,777	22,269
Professional services
Revenue
Revenue	9,613	7,570	28,051	23,292
Cost of revenue
Cost of revenue	$ 8,916	$ 6,763	$ 26,925	$ 21,599