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Related Parties - Additional information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transactions |  |  |  |  |
Research and development expense | $ 14,828,000 | $ 10,785,000 | $ 37,049,000 | $ 38,602,000 |
Due to related parties | 100,674,000 |  | 100,674,000 |  | $ 71,979,000
LaunchLabs Agreement | Subsidiary whose founder and executive chairman of parent is a member of the Company's board of directors | Alexandria LaunchLabs |  |  |  |  |
Related Party Transactions |  |  |  |  |
Research and development expense | 25,000 | $ 24,000 | 100,000 | $ 100,000 |
Due to related parties | $ 0 |  | $ 0 |  | $ 8,000,000

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