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Related-Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Related-Party Transactions |  |  |  |
Research and development | $ 15,307 | $ 18,518 | $ 32,769 | $ 35,159
Penn |  |  |  |
Related-Party Transactions |  |  |  |
Research and development |  |  |  | $ 300

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