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Geographic and Segment Information - Consolidated Net Loss (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Geographic and Segment Information    
Revenues $ 43,000 $ 420,000
Operating expenses:    
Research and development 6,655,000 19,155,000
General and administrative 5,392,000 6,718,000
Total operating expenses 12,047,000 25,873,000
Operating loss (12,004,000) (25,453,000)
Total other expense, net 10,000 (98,000)
Loss before taxes (11,994,000) (25,551,000)
Income tax benefit 782,000 2,996,000
Net loss (11,212,000) (22,555,000)
Single Reportable Segment    
Geographic and Segment Information    
Revenues 43,000 420,000
Operating expenses:    
Research and development 6,655,000 19,155,000
General and administrative 5,392,000 6,718,000
Total operating expenses 12,047,000 25,873,000
Operating loss (12,004,000) (25,453,000)
Total other expense, net 10,000 (98,000)
Loss before taxes (11,994,000) (25,551,000)
Income tax benefit 782,000 2,996,000
Net loss $ (11,212,000) $ (22,555,000)