Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue
Revenue	$ 59,045	$ 45,225	$ 113,115	$ 89,156
Cost of revenue
Cost of revenue	19,215	14,519	36,629	29,938
Gross profit	39,830	30,706	76,486	59,218
Operating expenses
Research and development	12,177	10,263	24,074	19,921
Sales and marketing	24,024	20,992	46,702	40,609
General and administrative	7,499	6,620	17,653	13,154
Total operating expenses	43,700	37,875	88,429	73,684
Loss from operations	(3,870)	(7,169)	(11,943)	(14,466)
Other (expense) income
Interest expense	(1,912)	(10)	(2,124)	(20)
Interest income	871	275	1,249	533
Other income (expense), net	10	(1)	(28)	(13)
Foreign exchange (loss) gain	(576)	119	(462)	66
Loss before income taxes	(5,477)	(6,786)	(13,308)	(13,900)
Benefit from (provision for) income taxes	180	(126)	(88)	(151)
Net loss	$ (5,297)	$ (6,912)	$ (13,396)	$ (14,051)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.12)	$ (0.18)	$ (0.31)	$ (0.36)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	43,921	39,175	43,345	38,793
Subscription
Revenue
Revenue	$ 49,206	$ 37,247	$ 94,677	$ 73,434
Cost of revenue
Cost of revenue	9,671	7,252	18,620	15,102
Professional services
Revenue
Revenue	9,839	7,978	18,438	15,722
Cost of revenue
Cost of revenue	$ 9,544	$ 7,267	$ 18,009	$ 14,836