CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net sales	$ 3,299	$ 2,960	$ 9,032	$ 9,780
Cost of Goods and Services Sold [Abstract]
Cost of sales	2,008	2,381	5,931	7,318
Inventory write-down	1,184	0	1,184	0
Total cost of sales	3,192	2,381	7,115	7,318
Gross profit	107	579	1,917	2,462
Costs and expenses:
Research and development	6,996	7,285	19,783	20,885
Sales, general and administrative	7,761	8,255	25,432	30,422
Total costs and expenses	14,757	15,540	45,215	51,307
Loss from operations	(14,650)	(14,961)	(43,298)	(48,845)
Other income (expense):
Gain on fair value adjustment	18,056	0	13,026	0
Foreign currency exchange gain	(428)	(261)	(170)	(221)
Interest income	246	73	921	151
Other (expense) income, net	(29)	(49)	56	(206)
Total other income (expense), net	15,691	(935)	(5,036)	961
Net income (loss) before income taxes	1,041	(15,896)	(48,334)	(47,884)
Provision for income taxes	(131)	0	(286)	0
Net income (loss)	$ 910	$ (15,896)	$ (48,620)	$ (47,884)
Basic net income (loss) per share (in usd per share)	$ 0.06	$ (1.83)	$ (4.13)	$ (6.21)
Basic weighted average shares outstanding (in shares)	14,433	8,701	11,777	7,705
Dilutive net income (loss) per share (in usd per share)	$ 0.06	$ (1.83)	$ (4.13)	$ (6.21)
Dilutive weighted average shares outstanding (in shares)	14,553	8,701	11,777	7,705
Other comprehensive loss:
Net income (loss)	$ 910	$ (15,896)	$ (48,620)	$ (47,884)
Net unrealized gain (loss) on debt securities available-for-sale	0	48	28	(84)
Foreign currency translation adjustment	293	139	12	(101)
Comprehensive income (loss)	1,203	(15,709)	(48,580)	(48,069)
Nonrelated Party
Other income (expense):
Interest expense	(2,205)	(203)	(3,798)	(1,833)
Gain (loss) on extinguishment of debt	51	0	(6,499)	3,565
Related Party
Other income (expense):
Interest expense	0	(495)	(1,817)	(495)
Gain (loss) on extinguishment of debt	$ 0	$ 0	$ (6,755)	$ 0