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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Royalty revenues $ 120 $ 165 $ 350 $ 532
Costs and expenses:        
Research and development 8,197 9,640 30,254 27,140
Selling, general and administrative 3,897 3,126 11,229 9,471
Total operating expenses 12,094 12,766 41,483 36,611
Loss from operations (11,974) (12,601) (41,133) (36,079)
Other income (expense), net:        
Interest income, net 716 741 2,492 2,472
Other income (expense), net 0 5 6 (37)
Total other income (expense), net 716 746 2,498 2,435
Net loss (11,258) (11,855) (38,635) (33,644)
Preferred stock dividend payable on Series A Convertible Preferred Stock (6) (6) (18) (18)
Net loss attributable to common stockholders $ (11,264) $ (11,861) $ (38,653) $ (33,662)
Net loss per common share - basic $ (0.17) $ (0.25) $ (0.58) $ (0.74)
Net loss per common share - diluted $ (0.17) $ (0.25) $ (0.58) $ (0.74)
Weighted-average shares outstanding - basic 66,879 46,865 66,644 45,461
Weighted-average shares outstanding - diluted 66,879 46,865 66,644 45,461