Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 10,338	$ 12,674	$ 21,268	$ 25,409
Cost of revenues (including depreciation of $13, $27, $27, and $60 in the three and six months ended June 30, 2023 and 2022, respectively)	2,589	3,617	5,871	7,253
Gross profit	7,749	9,057	15,397	18,156
Operating expenses:
Selling and marketing	2,628	3,720	6,182	6,701
Research and development	3,705	8,080	9,573	15,346
General and administrative	3,040	3,753	6,515	7,677
Depreciation and amortization	1,620	1,877	3,305	3,844
Total operating expenses	10,993	17,430	25,575	33,568
Operating loss	(3,244)	(8,373)	(10,178)	(15,412)
Other income (expense):
Change in fair value of warrant and derivative liabilities	429	0	3,413	0
Loss on derecognition of debt	(775)	0	(1,402)	0
Interest (expense) income, net	(2,037)	2	(4,297)	(2)
Other expense, net	(36)	(91)	(76)	(32)
Loss before provision for income taxes	(5,663)	(8,462)	(12,540)	(15,446)
Provision for income tax expense	2	31	11	50
Net loss	$ (5,665)	$ (8,493)	$ (12,551)	$ (15,496)
Loss per share:
Basic (in dollars per share)	$ (0.09)	$ (0.15)	$ (0.21)	$ (0.28)
Diluted (in dollars per share)	$ (0.09)	$ (0.15)	$ (0.21)	$ (0.28)
Weighted average shares outstanding:
Basic (in shares)	62,453	55,183	59,726	55,844
Diluted (in shares)	62,453	55,183	59,726	55,844