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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Write off of accrued interest receivable     $ 0 $ 0  
Total net unrealized gain (loss) recorded in accumulated other comprehensive income (loss)     (1,200)   $ (8,400)
Brii Bio Parent          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Investment owned at fair value $ 10,800   10,800    
Increase (decrease) in equity securities (2,700) $ (13,600) (20,900) $ (120,000)  
Humabs          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Estimated fair value of contingent consideration $ 24,300   $ 24,300   23,400
Maximum          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Securities contractual term 2 years   2 years    
Prepaid Expenses and Other Current Assets          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Accrued interest receivable excluded from fair value and amortized cost basis of available for sale securities $ 2,900   $ 2,900   $ 2,500