CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 47,268	$ 26,457	$ 92,516	$ 74,279
Cost of revenue	22,491	13,497	45,758	39,925
Gross profit	24,777	12,960	46,758	34,354
Operating expenses:
Research and development	15,900	10,661	29,691	21,718
Sales and marketing	8,196	6,123	15,841	13,613
General and administrative	8,998	12,446	17,152	18,688
Restructuring costs			1,263
Total operating expenses	33,094	29,230	63,947	54,019
Loss from operations	(8,317)	(16,270)	(17,189)	(19,665)
Other income (expense), net	(4)	126	19	535
Interest expense	(525)	(1,349)	(1,050)	(2,661)
Loss before income taxes	(8,846)	(17,493)	(18,220)	(21,791)
Income tax expense	(60)	(41)	(102)	(69)
Net loss	$ (8,906)	$ (17,534)	$ (18,322)	$ (21,860)
Net loss per share — basic and diluted	$ (0.37)	$ (0.77)	$ (0.77)	$ (0.97)
Weighted-average shares outstanding — basic and diluted	24,120	22,716	23,895	22,564