Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 5,258	$ 28,722
Cost of revenue	2,846	12,750
Gross profit	2,412	15,972
Operating expenses:
Research and development	3,428	4,569
Sales and marketing	1,436	1,942
General and administrative	10,693	12,341
Total operating expenses	15,557	18,852
Operating loss	(13,145)	(2,880)
Other expense, net	0	(606)
Interest expense, net	(1,400)	(2,007)
Loss before income taxes	(14,545)	(5,493)
Income tax expense	(100)	0
Net loss	(14,645)	(5,493)
Dividends on preferred stock - declared and undeclared	(2,239)	(2,239)
Net loss attributable to common stockholders	(16,884)	(7,732)
Net loss attributable to common stockholders	$ (16,884)	$ (7,732)
Net loss per common share, basic (in dollars per share)	$ (0.81)	$ (0.44)
Net loss per common share, diluted (in dollars per share)	$ (0.81)	$ (0.44)
Weighted-average common shares outstanding, basic (in shares)	20,723	17,622
Weighted-average common shares outstanding, diluted (in shares)	20,723	17,622