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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