Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Sales	$ 5,786,000	$ 4,170,000	$ 14,167,000	$ 9,764,000
Cost of sales	4,445,000	3,450,000	12,519,000	9,439,000
Gross profit	1,341,000	720,000	1,648,000	325,000
Operating expenses:
Selling, general and administrative	9,076,000	3,825,000	21,189,000	10,773,000
Research and development	5,377,000	5,801,000	18,583,000	16,662,000
Total operating expenses	14,453,000	9,626,000	39,772,000	27,435,000
Loss from operations	(13,112,000)	(8,906,000)	(38,124,000)	(27,110,000)
Other income (expense), net:
Change in fair value of warrants	1,503,000	39,518,000	2,717,000	27,933,000
Expiration of warrant			5,018,000
Interest expense	(1,079,000)	(3,000)	(2,603,000)	(12,000)
Interest and other income	11,000	63,000	44,000	522,000
(Loss) income before income taxes	(12,677,000)	30,672,000	(32,948,000)	1,333,000
Income tax expense	(4,000)	8,000	6,000	53,000
Net (loss) income	(12,673,000)	30,664,000	(32,954,000)	1,280,000
Accretion to redemption value of redeemable preferred stock and redeemable stock options		(7,829,000)		(16,172,000)
Net (loss) income attributable to common stockholders	(12,673,000)	5,900,000	(32,954,000)	(14,892)
Other comprehensive income (loss)
Unrealized loss on short-term investments	(5,000)	(8,000)	(2,000)	(43,000)
Foreign currency translation loss	(3,000)	(9,000)	(6,000)	(7,000)
Total other comprehensive loss	(8,000)	(17,000)	(8,000)	(50,000)
Comprehensive (loss) income	$ (12,681,000)	$ 30,647,000	$ (32,962,000)	$ 1,230,000
Net (loss) income per share:
Attributable to common stock, basic	$ (0.68)	$ 0	$ (3.66)	$ 0
Attributable to common stock, diluted	$ (0.68)	$ 0	$ (3.66)	$ 0
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic	18,732,459	0	8,998,895	0
Attributable to common stock, diluted	18,732,459	0	8,998,895	0
Series G Preferred Stock [Member]
Net (loss) income per share:
Attributable to Series G common stock, basic and diluted	$ 0	$ 0.01	$ 0	$ (0.76)
Weighted-average shares used in computing net loss per share:
Attributable to Series G common stock, basic and diluted	0	1	0	1
Redeemable Common Stock
Other income (expense), net:
Earnings Allocated to Redeemable Preferred Stock	$ 0	$ (16,935,000)	$ 0	$ 0
Net (loss) income per share:
Attributable to common stock, basic	$ 0	$ 1.55	$ 0	$ (4.06)
Attributable to common stock, diluted	$ 0	$ 1.13	$ 0	$ (4.06)
Weighted-average shares used in computing net loss per share:
Attributable to common stock, basic	0	3,798,504	0	3,672,121
Attributable to common stock, diluted	0	5,571,793	0	3,672,121