Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Product revenue	$ 111,769	$ 77,389	$ 58,970
Development, service and licensing revenue	518	1,090	4,793
Total revenue	112,287	78,479	63,763
Cost of revenue:
Cost of product revenue	52,614	37,360	29,003
Cost of development, service and licensing revenue	220	273	1,118
Total cost of revenue	52,834	37,633	30,121
Gross profit	59,453	40,846	33,642
Operating expenses:
Research and development expense	25,185	17,579	14,287
Sales and marketing expense	22,330	14,579	10,825
General and administrative expense	12,426	7,087	6,115
Offering costs			1,959
Total operating expenses	59,941	39,245	33,186
Income (loss) from operations	(488)	1,601	456
Interest income (expense) and other income (expense), net:
Interest expense	(1,633)	(1,208)	(901)
Interest income and other income (expense), net	616	673	838
Total interest income (expense) and other, net	(1,017)	(535)	(63)
Income (loss) before tax expense	(1,505)	1,066	393
Income tax expense	(168)	(166)	(96)
Net income (loss)	(1,673)	900	297
Less: Accretion of preferred stock	(6,258)	(11,301)	(11,301)
Net loss attributable to common stockholders	$ (7,931)	$ (10,401)	$ (11,004)
Net loss per share attributable to common stockholders — basic and diluted	$ (0.74)	$ (2.67)	$ (3.30)
Weighted-average shares used to compute net loss per share attributable to common stockholders — basic and diluted	10,778	3,893	3,338