CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net sales	$ 2,921	$ 3,861	$ 5,733	$ 6,820
Cost of sales	2,122	2,781	3,923	4,937
Gross profit	799	1,080	1,810	1,883
Costs and expenses:
Research and development	5,820	7,576	12,788	13,600
Sales, general and administrative	7,564	11,493	17,669	22,167
Total costs and expenses	13,384	19,069	30,457	35,767
Loss from operations	(12,585)	(17,989)	(28,647)	(33,884)
Other (expense) income:
(Loss) on fair value adjustment	(5,030)	0	(5,030)	0
Foreign currency exchange gain	25	31	258	40
Interest income	255	56	675	78
Other income (expense), net	40	(107)	85	(157)
Total other (expense) income, net	(19,994)	(534)	(20,727)	1,896
Net loss before income taxes	(32,579)	(18,523)	(49,374)	(31,988)
Provision for income taxes	(156)	0	(156)	0
Net loss	$ (32,735)	$ (18,523)	$ (49,530)	$ (31,988)
Basic net loss per share (in usd per share)	$ (2.97)	$ (2.43)	$ (4.75)	$ (4.44)
Diluted net loss per share (in usd per share)	$ (2.97)	$ (2.43)	$ (4.75)	$ (4.44)
Weighted average shares outstanding, basic (in shares)	11,009	7,623	10,420	7,200
Weighted average shares outstanding, diluted (in shares)	11,009	7,623	10,420	7,200
Other comprehensive loss:
Net loss	$ (32,735)	$ (18,523)	$ (49,530)	$ (31,988)
Net unrealized gain (loss) on debt securities available-for-sale	4	(39)	28	(132)
Foreign currency translation adjustment	(26)	(161)	(281)	(240)
Comprehensive loss	(32,757)	(18,723)	(49,783)	(32,360)
Nonrelated Party
Other (expense) income:
Interest expense	(1,175)	(713)	(1,593)	(1,630)
Interest expense related-party	1,175	713	1,593	1,630
(Loss) gain on extinguishment of debt	(6,550)	199	(6,550)	3,565
Related Party
Other (expense) income:
Interest expense	(804)	0	(1,817)	0
Interest expense related-party	804	0	1,817	0
(Loss) gain on extinguishment of debt	$ (6,755)	$ 0	$ (6,755)	$ 0