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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Statement [Abstract]        
Revenue from contract with customer, product and service, extensible enumeration Service [Member] Service [Member] Service [Member] Service [Member]
Service revenue $ 1,705 $ 50 $ 1,727 $ 50
Cost of revenue 388 12 388 12
Gross profit 1,317 38 1,339 38
Operating expenses:        
Research and development expenses 10,204 10,896 20,323 20,867
Selling, general and administrative expenses 10,007 12,861 20,277 27,714
Total operating expenses 20,211 23,757 40,600 48,581
Loss from operations (18,894) (23,719) (39,261) (48,543)
Other income (expense):        
Change in fair value of warrant liability 451 2,254 338 1,803
Realized (loss) gain on disposal of asset (17) 1 (17) (69)
Interest income 357 5 912 5
Interest expense (732) (1,413) (1,652) (2,905)
Litigation settlement, net 0 0 0 3
Other income 0 0 20 0
Total other income (expense) 59 847 (399) (1,163)
Net loss $ (18,835) $ (22,872) $ (39,660) $ (49,706)
Net loss per share, basic (in dollars per share) $ (0.20) $ (0.28) $ (0.43) $ (0.62)
Net loss per share, fully diluted (in dollars per share) $ (0.20) $ (0.28) $ (0.43) $ (0.62)
Weighted average shares outstanding, basic (in shares) 95,978,588 81,319,533 91,791,957 80,642,670
Weighted average shares outstanding, fully diluted (in shares) 95,978,588 81,319,533 91,791,957 80,642,670