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Investment in MiNK Therapeutics, Inc. - Summarized Balance Sheet Information and Results of Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]                  
Current assets $ 133,950           $ 133,950   $ 45,574
Current liabilities 287,132           287,132   $ 221,401
Net loss attributable to Agenus 63,911 $ (30,012) $ (26,370) $ (67,214) $ (54,797) $ (63,454) 7,529 $ (185,465)  
MiNK Therapeutics, Inc.                  
Investment Company, Nonconsolidated Subsidiary [Line Items]                  
Current assets 14,534           14,534    
Non-current assets 429           429    
Current liabilities 13,434           13,434    
Non-current liabilities 15,043           $ 15,043    
Net loss (2,888)                
Net loss attributable to Agenus $ (1,386)