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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025 | May 31, 2024
Related Party Transaction [Line Items] |  |  |  |
Research and development expense | $ 70,873 | $ 10,130 |  |
Accrued expenses | 46,714 |  | $ 37,836 |
Hengrui License Agreement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Research and development expense | 400 | $ 400 |  |
Accrued expenses | $ 600 |  | $ 200 |
Hengrui License Agreement | Series A-2 Convertible Preferred Stock |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Shares issued as a percentage of outstanding capital stock |  |  |  | 19.90%

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