Condensed Consolidated Statement of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue
Subscription	$ 37,247	$ 31,404	$ 73,434	$ 61,681
Professional services	7,978	7,375	15,722	13,941
Total revenue	45,225	38,779	89,156	75,622
Cost of revenue
Subscription	7,252	6,559	15,102	13,039
Professional services	7,267	6,596	14,836	12,712
Total cost of revenue	14,519	13,155	29,938	25,751
Gross profit	30,706	25,624	59,218	49,871
Operating expenses
Research and development	10,263	8,626	19,921	17,057
Sales and marketing	21,094	19,669	40,120	35,956
General and administrative	6,620	5,504	13,154	10,684
Total operating expenses	37,977	33,799	73,195	63,697
Loss from operations	(7,271)	(8,175)	(13,977)	(13,826)
Other income (expense)
Interest income (expense) and other, net	264	(377)	500	(434)
Foreign exchange gain (loss)	120	(295)	68	(407)
Loss before provision for income taxes	(6,887)	(8,847)	(13,409)	(14,667)
Provision for income taxes	(126)	(138)	(151)	(214)
Net loss	$ (7,013)	$ (8,985)	$ (13,560)	$ (14,881)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.18)	$ (0.69)	$ (0.35)	$ (1.14)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	39,175	13,036	38,793	13,016