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Related Party Transactions (Details) - Related party | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 item | Dec. 31, 2020 shares
Xencor |  |
Related Party Transactions |  |
Number of antibody product candidates | 3 |
Number of license agreements | 2 |
Xencor | Maximum |  |
Related Party Transactions |  |
Ownership percentage by related party | 10.00% |
Viridian |  |
Related Party Transactions |  |
Ownership percentage by related party | 0.10% |
Number of common stock issued | shares |  | 38,707
Viridian | Fairmount Funds Management LLC |  |
Related Party Transactions |  |
Number of seats held in board | 2 |
Viridian | Fairmount Funds Management LLC | Maximum |  |
Related Party Transactions |  |
Ownership percentage by related party | 10.00% |

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