Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 18,594	$ 24,022	$ 73,801	$ 53,586
Cost of revenue	5,856	13,068	27,125	30,177
Gross profit	12,738	10,954	46,676	23,409
Operating expenses:
Research and development	4,563	3,697	13,531	8,015
Sales and marketing	2,269	1,165	7,839	3,102
General and administrative	11,374	9,100	35,305	25,391
Total operating expenses	18,206	13,962	56,675	36,508
Operating loss	(5,468)	(3,008)	(9,999)	(13,099)
Other expense, net	(361)	(847)	(1,004)	(1,226)
Interest expense, net	(2,054)	(1,818)	(6,090)	(5,156)
Net loss	(7,883)	(5,673)	(17,093)	(19,481)
Dividends on preferred stock - declared and undeclared	(2,239)	(464)	(6,716)	(464)
Net loss attributable to common stockholders	(10,122)	(6,137)	(23,809)	(19,945)
Net loss attributable to common stockholders	$ (10,122)	$ (6,137)	$ (23,809)	$ (19,945)
Net loss per common share, basic (in dollars per share)	$ (0.54)	$ (0.36)	$ (1.31)	$ (1.17)
Net loss per common share, diluted (in dollars per share)	$ (0.54)	$ (0.36)	$ (1.31)	$ (1.17)
Weighted-average common shares outstanding, basic (in shares)	18,915	17,280	18,236	16,990
Weighted-average common shares outstanding, diluted (in shares)	18,915	17,280	18,236	16,990