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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Revenues $ 4,697,000 $ 7,031,000
Cost of goods sold 5,574,000 13,030,000
Gross loss (877,000) (5,999,000)
Operating expenses    
General and administrative 11,599,000 11,322,000
Research and development 5,749,000 6,949,000
Sales and marketing 1,804,000 2,028,000
Total operating expenses 19,152,000 20,299,000
Loss from operations (20,029,000) (26,298,000)
Other (expense) income, net (4,151,000) 81,000
Change in fair value of derivative instruments (97,000) (435,000)
Change in fair value of earn-out shares liability (52,000) 2,624,000
Loss before provision for income taxes (24,329,000) (24,028,000)
Provision for income taxes 2,000 2,000
Net loss (24,331,000) (24,030,000)
Marketable debt securities, available-for-sale    
Net unrealized gain (loss), net of tax of $0, for the three months ended March 31, 2023 and 2022 402,000 (826,000)
Total comprehensive loss $ (23,929,000) $ (24,856,000)
Net loss per share    
Net loss per share — basic (in dollar per share) $ (0.14) $ (0.15)
Net loss per share — diluted (in dollar per share) $ (0.14) $ (0.15)
Weighted average shares outstanding    
Weighted average shares outstanding — basic (in shares) 168,829,000 163,165,000
Weighted average shares outstanding — diluted (in shares) 168,829,000 163,165,000