Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Details)

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Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2024
Jan. 01, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Mar. 17, 2015
Fortress Biotech, Inc            
Significant Accounting Policies            
Percentage of shares issued for offering and annual equity fee 2.50%         2.50%
Number of shares issued and sold 1,492,915 368,907 193,905 35,714    
Research and development            
Significant Accounting Policies            
Value of common stock shares issued         $ 3.4