Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Sales	$ 22,593	$ 14,678
Cost of sales	18,076	12,973
Gross profit (loss)	4,517	1,705
Operating expenses:
Selling, general and administrative	32,805	15,176
Research and development	24,499	21,934
Loss on sale of equipment		7
Total operating expenses	57,304	37,117
Loss from operations	(52,787)	(35,412)
Other income (expense):
Change in fair value of warrants	2,717	63,011
Expiration of warrant	5,018
Interest expense	(3,682)	(510)
Interest and other income, net	54
(Loss) income before income taxes	(48,680)	27,632
Income tax expense	8	57
Net income (loss)	(48,688)	27,575
Accretion to redemption value of redeemable preferred stock and redeemable stock options		(24,209)
Net loss attributable to common stockholders	(48,688)	3,366
Other comprehensive loss
Unrealized gain (loss) on short-term investments	(7)	(49)
Foreign currency translation gain (loss)	(10)
Total other comprehensive loss	(17)	(49)
Comprehensive loss (income)	$ (48,705)	$ 27,526
Net (loss) income per share:
Attributable to common stock, basic	$ (3.57)	$ 0.91
Attributable to common stock, diluted	$ (3.57)	$ 0.15
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic	13,625,044	3,707,207
Attributable to common stock, diluted	13,625,044	5,532,305
Series G Preferred Stock [Member]
Net (loss) income per share:
Attributable to Series G common stock, basic		$ (0.39)
Attributable to Series G common stock, diluted		$ (0.62)
Weighted-average shares used in computing net loss per share:
Attributable to Series G common stock, basic and diluted		1