Annual report [Section 13 and 15(d), not S-K Item 405]

Stockholders' Equity (At-the-Market Offering of Common Stock) (Details)

v3.26.1
Stockholders' Equity (At-the-Market Offering of Common Stock) (Details)
 12 Months Ended
Jan. 01, 2025
shares
Dec. 31, 2025
USD ($)
item
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
May 31, 2024
Dec. 31, 2016
USD ($)
shares
Stockholders' Equity          
Common stock, shares authorized   200,000,000 200,000,000    
Common stock par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001    
Preferred stock, shares authorized   2,000,000 2,000,000    
Preferred stock, shares issued   250,000 250,000    
Common stock, shares issuable   278,385 69,046    
Par value | $   $ 273,000 $ 611,000    
Price per common stock | $ / shares     $ 18.78    
Fortress Biotech, Inc          
Stockholders' Equity          
Par value | $         $ 900
Shares issued for services (in shares) 69,046 127,140 23,450    
At the Market Offering          
Stockholders' Equity          
Agent commission (as a percent)       3.00%  
Issuance of common shares (in shares)   54,000 140,000    
Price per common stock | $ / shares   $ 11.55      
Proceeds from issuance of common shares | $   $ 600,000 $ 2,600,000    
Proceeds from issuance of Common Stock, net of offering costs | $   600,000 2,500,000    
Aggregate fees of stock issuance | $   $ 27,000 $ 100,000    
At the Market Offering | Fortress Biotech, Inc          
Stockholders' Equity          
Price per common stock | $ / shares   $ 11.55 $ 18.78    
Proceeds from issuance of common shares | $   $ 600,000 $ 2,600,000    
Shares issued for services (in shares)   1,361 3,509    
Common Shares          
Stockholders' Equity          
Number of votes per share | item   1      
Common Shares | Fortress Biotech, Inc          
Stockholders' Equity          
Common stock, shares issuable         2,666
Class A common shares          
Stockholders' Equity          
Common stock, shares authorized   1,000,000      
Director appointment right, period   10 years      
Class B common shares | Fortress Biotech, Inc          
Stockholders' Equity          
Common stock, shares issuable         7,000,000
Class A Preferred Shares          
Stockholders' Equity          
Preferred stock, shares issued   250,000