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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 |

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