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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Royalties $ 205 $ 83
Costs and expenses:    
Research and development 8,008 9,052
Selling, general and administrative 3,130 3,083
Total operating expenses 11,138 12,135
Loss from operations (10,933) (12,052)
Interest income, net 926 940
Other income (expense), net (4) (111)
Total other income (expense), net 922 829
Net loss (10,011) (11,223)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6)
Net loss attributable to common stockholders $ (10,017) $ (11,229)
Net loss per common share - basic (in dollars per share) $ (0.22) $ (0.25)
Net loss per common share - diluted (in dollars per share) $ (0.22) $ (0.25)
Weighted-average shares outstanding - basic (in shares) 44,678 44,677
Weighted-average shares outstanding - diluted (in shares) 44,678 44,677