Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 114	$ 64	$ 227	$ 130
Cost of revenues	150	97	287	193
Gross loss	(36)	(33)	(60)	(63)
Operating expenses:
Research and development	4,633	7,358	10,717	13,662
Selling, general and administrative	10,648	14,948	23,659	30,339
Total operating expenses	15,281	22,306	34,376	44,001
Operating loss	(15,317)	(22,339)	(34,436)	(44,064)
Other income (expense):
Other income	1,126	40	2,169	49
Interest expense	(635)	(194)	(1,257)	(370)
Change in estimated fair value of earn-out liabilities	3,067		1,054
Total other income (expense)	3,558	(154)	1,966	(321)
Loss before income taxes	(11,759)	(22,493)	(32,470)	(44,385)
Income tax expense	0	0	0	0
Net loss	(11,759)	(22,493)	(32,470)	(44,385)
Unrealized loss on short-term investments	(27)	(1)	(4)	(7)
Comprehensive loss	(11,786)	(22,494)	(32,474)	(44,392)
Net loss	(11,759)	(22,493)	(32,470)	(44,385)
Dividends on Series D convertible preferred stock		(2,908)		(5,785)
Redemption value of Series D convertible preferred stock		(1,455)		(2,893)
Net loss attributable to common stockholders - basic	$ (11,759)	$ (26,856)	$ (32,470)	$ (53,063)
Net loss per share attributable to common stockholders - basic	$ (0.15)	$ (15.86)	$ (0.42)	$ (31.43)
Net loss per share attributable to common stockholders - diluted	$ (0.15)	$ (15.86)	$ (0.42)	$ (31.43)
Weighted average common shares outstanding, Basic	78,150,143	1,693,722	78,114,775	1,688,157
Weighted average common shares outstanding, Diluted	78,150,143	1,693,722	78,114,775	1,688,157