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Related-Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Related-Party Transactions |  |  |  |
Research and development | $ 11,326 | $ 19,551 | $ 44,095 | $ 54,710
Penn |  |  |  |
Related-Party Transactions |  |  |  |
Research and development |  | $ 300 |  | $ 600

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