Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 19,932	$ 15,187	$ 55,566	$ 42,500
Cost of revenue	6,173	5,165	17,324	14,210
Gross profit	13,759	10,022	38,242	28,290
Operating expenses:
Sales and marketing	8,605	6,761	25,659	18,098
Research and development	3,917	3,025	10,560	8,494
General and administrative	3,666	3,863	10,252	8,441
Total operating expenses	16,188	13,649	46,471	35,033
Operating loss	(2,429)	(3,627)	(8,229)	(6,743)
Other income (expense), net:
Interest income				1
Interest expense	(195)	(160)	(506)	(405)
Other expenses, net	30	(20)	2	(52)
Total other expense, net	(165)	(180)	(504)	(456)
Loss before income taxes	(2,594)	(3,807)	(8,733)	(7,199)
(Provision for) benefit from income taxes	(35)	186	75	374
Net loss	$ (2,629)	$ (3,621)	$ (8,658)	$ (6,825)
Net loss per share attributable to common stockholders:
Basic	$ (0.18)	$ (0.30)	$ (0.66)	$ (0.56)
Diluted	$ (0.18)	$ (0.30)	$ (0.66)	$ (0.56)
Weighted-average common shares outstanding:
Basic	14,772,006	12,255,240	13,124,480	12,254,520
Diluted	14,772,006	12,255,240	13,124,480	12,254,520