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Related Party Transactions (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Feb. 12, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]          
Operating expenses   $ (4,545,000) $ (31,504,000) $ (34,567,000) $ (94,579,000)
Dr. Jennifer Buell          
Related Party Transaction [Line Items]          
Related party expenses incurred   4,000 $ 48,000 $ 167,000 $ 147,000
Agenus Inc.          
Related Party Transaction [Line Items]          
Qualified financing terms       In the event of a qualified financing event, as defined in the Note, the outstanding principal amount of the Note plus accrued and unpaid interest shall, at our election, either be paid in full or converted into equity shares equal to the quotient obtained by dividing (i) the amount due on the date of conversion by (ii) 80% of the per share price of the equity securities sold in the qualified financing. Upon a change of control, MiNK will pay Agenus an amount equal to (i) 1.5 times the principal then outstanding under the Note and (ii) the amount of accrued interest then outstanding immediately prior to the closing of such change of control.  
Percentage of per share price of equity securities sold in qualified financing 80.00%        
Period of license agreement       3 years  
Related party transaction, description       MiNK may terminate the Assignment and License Agreement without cause upon 90 days’ prior written notice to us. Either party may terminate if there has been a material breach which has not been cured within 90 days (or 45 days for breach of payment obligations) of receiving such notice.  
Terminate license agreement period       90 days  
Period for breach of payment obligations       45 days  
Operating expenses   220,000      
Due from related parties   15,000,000   $ 15,000,000  
Agenus Inc. | Convertible promissory note | Purchase Agreement [Member]          
Related Party Transaction [Line Items]          
Convertible debt, annual interest rate 2.00%        
Convertible debt, interest rate terms       Interest shall accrue and not be payable until converted or paid in connection with the repayment in full of the principal amount of the Note. The Note provides that MiNK will pay us, on request, the principal amount outstanding, together with any unpaid interest, on or after January 1, 2026  
Principal amount   5,000,000   $ 5,000,000  
Convertible debt issued, principal amount $ 5,000,000        
Accrued and unpaid interest balance   $ 154,000   $ 154,000  
Effective interest rate   15.00%   15.00%  
Agenus Inc. | New intercompany service agreement          
Related Party Transaction [Line Items]          
Percentage of service cost   10.00%      
Service agreement notice period       60 days  
Agenus Inc. | Individual services          
Related Party Transaction [Line Items]          
Service agreement notice period       30 days