CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Revenue	$ 1,027	$ 503	$ 2,657	$ 3,123
Operating expenses:
Cost of goods sold (exclusive of depreciation and amortization)	3,232	2,830	9,397	8,868
Research and development	5,007	4,567	14,579	12,725
Selling, general and administrative	6,152	10,152	18,722	29,874
Depreciation and amortization	1,256	891	3,559	2,657
Total operating expenses	15,647	18,440	46,257	54,124
Operating loss	(14,620)	(17,937)	(43,600)	(51,001)
Other income (expense):
Interest income (expense)	(1,740)	336	(1,614)	445
Change in fair value of warrants	(6,737)	(962)	(9,800)	23,188
Other loss	(99)	(152)	(166)	(205)
Loss before income taxes	(23,196)	(18,715)	(55,180)	(27,573)
Provision for income taxes	24	15	159	41
Net loss	(23,220)	(18,730)	(55,339)	(27,614)
Foreign currency translation adjustment	(670)	(2)	(218)	(24)
Comprehensive loss	(23,890)	(18,732)	(55,557)	(27,638)
Net loss	(23,220)	(18,730)	(55,339)	(27,614)
Net loss attributable to common stockholders	$ (23,220)	$ (18,730)	$ (55,339)	$ (27,614)
Weighted average of shares outstanding – basic (in shares)	108,045	101,397	107,504	98,513
Weighted average of shares outstanding – diluted (in shares)	108,045	101,397	107,504	98,513
Net loss attributable to common stockholders per share - basic (in dollars per share)	$ (0.21)	$ (0.18)	$ (0.51)	$ (0.28)
Net loss attributable to common stockholders per share - diluted (in dollars per share)	$ (0.21)	$ (0.18)	$ (0.51)	$ (0.28)