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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Royalties $ 93 $ 86 $ 258 $ 226
Costs and expenses:        
Research and development 6,009 4,154 20,665 11,552
Selling, general and administrative 3,077 2,930 10,103 8,003
Total operating expenses 9,086 7,084 30,768 19,555
Loss from operations (8,993) (6,998) (30,510) (19,329)
Interest income, net 458 70 841 185
Gain from change in fair value of derivative financial instruments—warrants 0 12 0 280
Other income (expense), net (36) 3 (338) 15
Total other income (expense), net 422 85 503 480
Net loss (8,571) (6,913) (30,007) (18,849)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (18) (18)
Net loss attributable to common stockholders $ (8,577) $ (6,919) $ (30,025) $ (18,867)
Net loss per common share - basic (in dollars per share) $ (0.20) $ (0.17) $ (0.69) $ (0.49)
Net loss per common share - diluted (in dollars per share) $ (0.20) $ (0.17) $ (0.69) $ (0.49)
Weighted-average shares outstanding - basic (in shares) 43,333 39,552 43,291 38,501
Weighted-average shares outstanding - diluted (in shares) 43,333 39,552 43,291 38,501