CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Total revenue	$ 59,130	$ 49,391	$ 119,036	$ 101,295
Cost of revenue
Total cost of revenue	16,296	14,286	32,807	28,504
Gross profit	42,834	35,105	86,229	72,791
Operating expenses
Research and development	20,718	16,239	40,845	31,775
Sales and marketing	22,252	19,787	43,258	38,500
General and administrative	21,654	8,943	33,422	18,364
Total operating expenses	64,624	44,969	117,525	88,639
Loss from operations	(21,790)	(9,864)	(31,296)	(15,848)
Interest expense	(449)	(475)	(899)	(930)
Other income, net	492	176	835	788
Loss before provision for income taxes	(21,747)	(10,163)	(31,360)	(15,990)
Provision for income taxes	21	33	26	42
Net loss	$ (21,768)	$ (10,196)	$ (31,386)	$ (16,032)
Net loss per common share:
Basic and diluted (in dollars per share)	$ (0.50)	$ (0.25)	$ (0.73)	$ (0.39)
Weighted-average common shares outstanding - basic and diluted (in shares)	43,234,655	41,429,691	43,048,110	41,270,038
Subscription and support
Revenue
Total revenue	$ 48,837	$ 40,980	$ 95,307	$ 80,520
Cost of revenue
Total cost of revenue	8,637	7,758	17,439	15,395
Professional services
Revenue
Total revenue	10,293	8,411	23,729	20,775
Cost of revenue
Total cost of revenue	$ 7,659	$ 6,528	$ 15,368	$ 13,109