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Investments - Schedule of Contractual Maturities of Held to Maturity Investments (Detail) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized cost basis, due in one year or less	[1]	$ 230,797	$ 115,263
Amortized cost basis due after one year through five years		16,796	7,155
Amortized cost basis, total		247,593	122,418
Aggregate fair value, due in one year or less	[1]	231,555	115,374
Aggregate fair value, due after one year through five years		16,992	7,197
Aggregate fair value, total		$ 248,547	$ 122,571
[1] The investments due in one year or less include cash equivalents of $41.6 million as of September 30, 2024 and $58.6 million as of December 31, 2023.

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