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License, Acquisitions and Other Agreements - Taldefgrobep Alfa License Agreement (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
License and other agreements |  |  |  |
Milestone payment to be paid upon regulatory achievement | $ 711,600,000 |  | $ 711,600,000 |
Research and development | 100,814,000 | $ 184,367,000 | 204,641,000 | $ 371,951,000
BMS |  |  |  |
License and other agreements |  |  |  |
Research and development | 0 | $ 0 | 0 | $ 0
BMS | Taldefgrobep Alfa License Agreement |  |  |  |
License and other agreements |  |  |  |
Milestone payment to be paid upon regulatory achievement | $ 200,000,000 |  | $ 200,000,000 |

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