CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 32,667	$ 25,325	$ 75,882	$ 55,985
Cost of revenue	15,765	13,178	39,021	29,875
Gross profit	16,902	12,147	36,861	26,110
Operating expenses:
Research and development	8,484	5,778	22,906	17,846
Selling, general and administrative	8,978	4,869	24,642	14,167
Total operating expenses	17,462	10,647	47,548	32,013
(Loss) income from operations	(560)	1,500	(10,687)	(5,903)
Interest expense	(110)	(426)	(726)	(1,320)
Other income (expense), net	3	5	51	(16)
(Loss) income before income taxes	(667)	1,079	(11,362)	(7,239)
Income tax expense			(1)	(1)
Net (loss) income	(667)	1,079	(11,363)	(7,240)
Net (loss) income attributable to common stockholders and comprehensive (loss) income	$ (667)	$ 1,079	$ (11,363)	$ (7,240)
Net (loss) income per share attributable to common stockholders, basic and diluted	$ (0.04)	$ 0.11	$ (0.72)	$ (0.72)
Weighted-average shares used to compute basic and diluted net (loss) income per share	16,818	10,000	15,737	10,000