Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 22,844	$ 17,069
Cost of revenue	7,654	5,475
Gross profit	15,190	11,594
Operating expenses:
Sales and marketing	10,906	8,205
Research and development	5,277	3,180
General and administrative	5,200	3,458
Total operating expenses	21,383	14,843
Operating loss	(6,193)	(3,249)
Other income (expense), net:
Interest income	51
Interest expense	(1)	(137)
Other income (expense), net	(32)	6
Total other expense, net	18	(131)
Loss before income taxes	(6,175)	(3,380)
(Provision for) benefit from income taxes	(27)	155
Net loss	$ (6,202)	$ (3,225)
Net loss per share attributable to common stockholders:
Basic	$ (0.23)	$ (0.26)
Diluted	$ (0.23)	$ (0.26)
Weighted-average common shares outstanding:
Basic	27,170,827	12,273,023
Diluted	27,170,827	12,273,023