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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]        
Royalties $ 141 $ 93 $ 332 $ 258
Costs and expenses:        
Research and development 8,022 6,009 25,094 20,665
Selling, general and administrative 2,939 3,077 10,318 10,103
Total operating expenses 10,961 9,086 35,412 30,768
Loss from operations (10,820) (8,993) (35,080) (30,510)
Interest income, net 1,068 458 3,061 841
Other income (expense), net 21 (36) (85) (338)
Total other income (expense), net 1,089 422 2,976 503
Net loss (9,731) (8,571) (32,104) (30,007)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (18) (18)
Net loss attributable to common stockholders $ (9,737) $ (8,577) $ (32,122) $ (30,025)
Net loss per common share - basic (in dollars per share) $ (0.22) $ (0.20) $ (0.72) $ (0.69)
Net loss per common share - diluted (in dollars per share) $ (0.22) $ (0.20) $ (0.72) $ (0.69)
Weighted-average shares outstanding - basic (in shares) 44,677 43,333 44,677 43,291
Weighted-average shares outstanding - diluted (in shares) 44,677 43,333 44,677 43,291