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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 26, 2024 | Sep. 30, 2024 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Commitments and Contingencies |  |  |  |  |
Decrease in finance lease, right-of-use asset, lease modification |  | $ 400 |  |  |
Decrease in finance lease, liability, lease modification |  | 400 |  |  |
Gain on sale of sale-leaseback |  | $ 100 |  | $ 82 | $ 0
Financing liability |  |  |  | 925 |
Loss contingency, estimate of possible loss |  |  |  | 1,200 |
Laboratory Equipment |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Financing liability |  |  |  | 1,400 |
Penn License Agreement | Penn |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Annual payments to be made |  |  |  | 25,000 |
Additional milestone payments for first CAR-M product |  |  |  | 1,700 |
Penn License Agreement | Penn | Maximum |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Milestone payments |  |  |  | 10,900 |
Additional milestone payments |  |  |  | $ 30,000 |
Novartis Agreement |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Agreement term (in years) |  |  | 5 years |  |
Contract termination fee | $ 4,000 |  |  |  |
Prepaid asset | $ 4,000 |  |  |  |

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