Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Sales	$ 11,360	$ 4,897	$ 20,301	$ 8,381
Cost of sales	6,572	5,709	11,752	8,074
Gross profit (loss)	4,788	(812)	8,549	307
Operating expenses:
Selling, general and administrative	14,388	6,502	28,008	12,113
Research and development	6,192	6,563	12,911	13,206
Total operating expenses	20,580	13,065	40,919	25,319
Loss from operations	(15,792)	(13,877)	(32,370)	(25,012)
Other income (expense), net:
Change in fair value of warrants	0	1,214	0	1,214
Expiration of warrant	0	0	0	5,018
Interest expense	(1,136)	(826)	(2,196)	(1,524)
Interest and other income	196	15	242	32
Loss before income taxes	(16,732)	(13,474)	(34,324)	(20,272)
Income tax expense	0	3	4	10
Net loss	(16,732)	(13,477)	(34,328)	(20,282)
Other comprehensive loss
Unrealized (loss) gain on short-term investments	(76)	(4)	(150)	3
Foreign currency translation (loss) gain	(9)	1	(13)	(3)
Total other comprehensive loss	(85)	(3)	(163)	0
Comprehensive loss	$ (16,817)	$ (13,480)	$ (34,491)	$ (20,282)
Net loss per share:
Attributable to common stock, basic	$ (0.61)	$ (3.28)	$ (1.25)	$ (5.00)
Attributable to common stock, diluted	$ (0.61)	$ (3.53)	$ (1.25)	$ (5.23)
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic	27,559,908	4,106,403	27,493,130	4,052,920
Attributable to common stock, diluted	27,559,908	4,166,439	27,493,130	4,113,249
Series G Preferred Stock [Member]
Net loss per share:
Attributable to Series G common stock, basic and diluted		$ (0.32)		$ (0.48)
Weighted-average shares used in computing net loss per share:
Attributable to Series G common stock, basic and diluted		1		1