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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

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