Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenue	$ 2,529	$ 5,258
Cost of revenue	847	2,846
Gross profit	1,682	2,412
Operating expenses:
Research and development	1,644	3,428
Sales and marketing	990	1,436
General and administrative	5,818	10,693
Restructuring, severance and related charges	457	0
Total operating expenses	8,909	15,557
Operating loss	(7,227)	(13,145)
Other income, net	291	0
Interest expense, net	(1,394)	(1,400)
Loss before income taxes	(8,330)	(14,545)
Income tax expense	(20)	(100)
Net loss	(8,350)	(14,645)
Dividends on preferred stock - declared and undeclared	(2,239)	(2,239)
Net loss attributable to common stockholders	(10,589)	(16,884)
Net loss attributable to common stockholders	$ (10,589)	$ (16,884)
Net loss per common share, basic (in dollars per share)	$ (0.38)	$ (0.81)
Net loss per common share, diluted (in dollars per share)	$ (0.38)	$ (0.81)
Weighted-average common shares outstanding, basic (in shares)	28,115	20,723
Weighted-average common shares outstanding, diluted (in shares)	28,115	20,723