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Business, Liquidity and Basis of Presentation (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 07, 2025 | Sep. 30, 2025 | Oct. 08, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Nov. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Product Information [Line Items] |  |  |  |  |  |  |  |
Cash, cash equivalents and short term investment |  | $ 3,500 |  |  |  |  |  |
Cash and cash equivalents |  | 3,458 |  |  | $ 40,437 |  | $ 44,784 | $ 76,110
Accumulated deficit |  | 2,172,187 |  |  | $ 2,182,880 |  |  |
Subordinated Notes [Member] |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 10,500 |  |  |  |  |  |
Debt instrument, maturity date |  | 2026-06 |  |  |  |  |  |
Promissory Note [Member] |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 2,750 |  | $ 22,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of common stock | $ 4,500 |  |  |  |  |  |  |
Zydus Promissory Note Agreement [Member] | Subsequent Event [Member] | Promissory Note [Member] |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 10,000 |  |  |  |  |
MiNK Therapeutics, Inc. |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Reduction of ownership percentage |  | 50.00% |  |  |  |  |  |
Recognized a gain on deconsolidation |  | $ 100,900 |  |  |  |  |  |
Zydus Lifesciences Ltd | Subsequent Event [Member] |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Anticipative upfornt payment | $ 91,000 |  |  |  |  |  |  |

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