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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
REVENUE:    
Total revenues $ 3,007 $ 1,579
COST OF REVENUE 3,637 808
Gross profit (loss) (630) 771
OPERATING EXPENSES:    
Research and development 26,543 17,130
Sales and marketing 10,548 3,408
General and administrative 25,514 6,715
Total operating expenses 62,605 27,253
LOSS FROM OPERATIONS (63,235) (26,482)
OTHER INCOME (EXPENSE):    
Change in fair value of embedded derivative liability and warrant liabilities 223 1,410
Gain on PPP loan forgiveness 2,297 0
Interest income and other 561 23
Interest expense and other (4,857) (1,502)
Total other income (expense), net (1,776) (69)
Provision for income tax expense 0 0
Net loss (65,011) (26,551)
Net unrealized loss on available-for-sale debt securities (391) 0
Comprehensive loss $ (65,402) $ (26,551)
PER SHARE DATA    
Net loss per common share (basic) (in dollars per share) $ (0.60) $ (0.26)
Net loss per common share (diluted) (in dollars per share) $ (0.60) $ (0.26)
Weighted average common shares outstanding (basic) (in shares) 109,055,894 102,803,202
Weighted average common shares outstanding (diluted) (in shares) 109,055,894 102,803,202
Prototype sales    
REVENUE:    
Total revenues $ 1,004 $ 365
Development contracts    
REVENUE:    
Total revenues $ 2,003 $ 1,214