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Fair Value Measurements and Financial Instruments - Summary of Change in Carrying Value of Level 3 Financial Instruments (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Redemptions |  | $ 0 |
MorphoSys |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Collaborative commitment to fund collaborative arrangement | $ 300,000 |  |
Equity Securities | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at the beginning of the period | 2,241 |  | $ 2,241
Balance at the end of the period |  |  | 2,241
Debt Securities | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at the beginning of the period | 751,700 | 437,800 | 751,700
Changes in fair value |  | (4,780) | 2,539
Sales |  |  | (510,553)
Redemptions |  | (4,320) | (12,586)
Balance at the end of the period |  | 428,700 | 231,100
Funding Commitments | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at the beginning of the period | (12,080) | (9,100) | (12,080)
Changes in fair value |  | (1,900) | (5,820)
Balance at the end of the period |  | $ (11,000) | (17,900)
Royalty at Fair Value | Level 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at the beginning of the period | $ 5,323 |  | 5,323
Balance at the end of the period |  |  | $ 5,323

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