Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Mar. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Prepaid expenses and other current assets		Prepaid expenses and other current assets		Prepaid expenses and other current assets
Accrued interest receivable	$ 4,000,000.0		$ 4,000,000.0		$ 5,000,000.0
Accrued interest receivable writeoff			0	$ 0
Total net unrealized gains recorded in accumulated other comprehensive loss			1,100,000		1,400,000
Equity securities	8,700,000		8,700,000
Unrealized gain (loss) on equity securities	1,335,000	$ 1,130,000	4,335,000	$ (4,356,000)
Contingent consideration obligation, current	0		0		16,060,000	$ 17,500,000
Humabs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration recognized	$ 34,200,000		$ 34,200,000		$ 40,100,000
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Securities contractual term (in years)	2 years		2 years