CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 31,727	$ 21,631
Cost of revenue	14,959	10,533
Gross profit	16,768	11,098
Operating expenses:
Research and development	7,343	5,434
Sales and marketing	7,336	5,030
General and administrative	4,087	2,502
Total operating expenses	18,766	12,966
Income (loss) from operations	(1,998)	(1,868)
Interest income (expense) and other income (expense), net	(105)	(447)
Income (loss) before tax expense	(2,103)	(2,315)
Income tax expense	(57)	(15)
Net income (loss)	(2,160)	(2,330)
Less: Accretion of preferred stock		(2,825)
Net income (loss) attributable to common stockholders — basic and diluted	$ (2,160)	$ (5,155)
Net income (loss) per share attributable to common stockholders — basic and diluted	$ (0.11)	$ (1.21)
Weighted-average shares used to compute net income (loss) per shares attributable to common stockholders — basic and diluted	20,344	4,267