Investments - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Note	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Schedule Of Investments [Line Items]
Interest on held to maturity investments	$ 3,200,000	$ 1,500,000	$ 9,800,000	$ 4,000,000
Net accretion on investments held to maturity	2,100,000	500,000	6,000,000	900,000
Allowance for credit losses	0		0			$ 0
Prepaid Expenses and Other Current Assets
Schedule Of Investments [Line Items]
Accrued interest receivable	$ 1,100,000		$ 1,100,000			$ 500,000
Convertible Promissory Note | Thirona Bio, Inc.
Schedule Of Investments [Line Items]
Hypothetical yield percentage	28		28			35
Volatility percentage	70		70			90
Interest on available for sale investment	$ 0	100,000	$ 0	400,000
Number of notes | Note			2
Amount Due	$ 8,000,000		$ 8,000,000		$ 8,000,000
Stated interest rate	10.00%		10.00%
Investment securities	$ 5,900,000		$ 5,900,000			$ 6,900,000
Recognized gain (loss)		900,000	1,600,000	900,000
Unrealized holding gain		$ 400,000	$ 600,000	$ 400,000