Investments - Schedule of Contractual Maturities of Held to Maturity Investments (Detail) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Maturity [Abstract]
Amortized cost basis, due in one year or less	[1]	$ 126,616	$ 152,862
Amortized cost basis due after one year through five years		3,271	1,961
Amortized cost basis, total		129,887	154,823
Aggregate fair value, due in one year or less	[1]	126,603	156,976
Aggregate fair value, due after one year through five years		3,258	1,948
Aggregate fair value, total		$ 129,861	$ 158,924

[1] The investments due in one year or less include cash equivalents of $68.6 million as of September 30, 2023 and $51.8 million as of December 31, 2022.