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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Condensed Consolidated Statements of Operations and Comprehensive Loss    
Revenue $ 4,493 $ 3,492
Costs and expenses:    
Cost of revenue 654 694
Research and development 5,278 4,728
General and administrative 7,793 12,542
Total costs and expenses 13,725 17,964
Loss from operations (9,232) (14,472)
Other income (expense):    
Interest income 922 4
Interest expense (1,124) (478)
Loss on extinguishment of debt (2,311) (997)
Total other expense, net (2,513) (1,471)
Net loss and comprehensive loss $ (11,745) $ (15,943)
Net loss per common share, basic (in dollars per share) $ (0.18) $ (0.30)
Net loss per common share, diluted (in dollars per share) $ (0.18) $ (0.30)
Weighted average common shares outstanding, basic (in shares) 64,656,424 52,465,283
Weighted average common shares outstanding, diluted (in shares) 64,656,424 52,465,283