Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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)			(2,200)		$ (8,400)
Brii Bio Parent
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investment Owned At Fair Value	$ 13,500		13,500
Increase Decrease In Equity Securities Fv Ni	(5,100)	$ (11,400)	(18,200)	$ (106,400)
Humabs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Estimated fair value of contingent consideration	$ 23,800		$ 23,800		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	$ 1,900		$ 1,900		$ 2,500