Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Sales	$ 8,942	$ 3,484
Cost of sales	5,181	2,365
Gross profit	3,761	1,119
Operating expenses:
Selling, general and administrative	13,620	5,611
Research and development	6,719	6,643
Total operating expenses	20,339	12,254
Loss from operations	(16,578)	(11,135)
Other income (expense), net:
Expiration of warrant	0	5,018
Interest expense	(1,060)	(698)
Interest and other income	(46)	(17)
Loss before income taxes	(17,592)	(6,798)
Income tax expense	(4)	7
Net loss	(17,596)	(6,805)
Other comprehensive income (loss)
Unrealized gain on short-term investments and cash equivalents, net of tax	(74)	7
Foreign currency translation loss	4	(4)
Total other comprehensive loss	78	3
Comprehensive loss	$ (17,674)	$ (6,802)
Net (loss) income per share:
Attributable to common stock, basic and diluted	$ (0.64)	$ (1.70)
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic and diluted	27,425,610	3,996,173
Series G Preferred Stock [Member]
Net (loss) income per share:
Attributable to Series G common stock, basic and diluted	$ 0	$ (0.16)
Weighted-average shares used in computing net loss per share:
Attributable to Series G common stock, basic and diluted	0	1