Quarterly report [Sections 13 or 15(d)]

Related Party Agreements (Narrative) (Details)

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Related Party Agreements (Narrative) (Details) - Fortress Biotech, Inc - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2025
Jul. 22, 2016
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Agreements              
Common stock dividend issued (in shares) 69,046            
Parent Company | Management Services Agreement (MSA)              
Related Party Agreements              
Percentage of annual fees expense related to Management Services Agreement recorded in research and development expenses     50.00% 50.00% 50.00% 50.00%  
Percentage of annual fees expense related to Management Services Agreement recorded in general and administrative expenses     50.00% 50.00% 50.00% 50.00%  
Expenses from related party transaction     $ 100,000 $ 100,000 $ 400,000 $ 400,000  
Parent Company | Founders Agreement              
Related Party Agreements              
Expenses from related party transaction     $ 200,000 $ 29,000 $ 400,000 $ 200,000  
Percentage of fully diluted equity   2.50%         2.50%
Shares issued for services (in shares)     59,334 1,330 127,140 14,152  
Research and development for licenses acquired             $ 600,000