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Commitments and Contingencies - Narratives (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Commitments and Contingencies |  |  |
Financing liability |  | $ 872 |
Accrued settlement |  | 200 |
Lab equipment |  |  |
Commitments and Contingencies |  |  |
Proceeds from sale and leaseback transactions |  | 1,200 | $ 1,600
Financing liability |  | 1,900 |
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 | 5 years |  |
Renewal term | 1 year |  |
Amount payable per calendar year for reserved capacity | $ 1,000 |  |
Termination fee payable | $ 4,000 |  |

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