Summary of Significant Accounting Policies - Schedule of Contractual Maturities of Held to Maturity Investments (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Held To Maturity Securities Debt Maturities [Abstract]
Amortized cost basis, due in one year or less	[1]	$ 103,733	$ 59,495
Amortized cost basis due after one year through five years		56,619
Amortized cost basis, total		160,352	59,495
Aggregate fair value, due in one year or less	[1]	103,669	59,495
Aggregate fair value, due after one year through five years		56,433
Aggregate fair value, total		$ 160,102	$ 59,495

[1] The investments due in one year or less include cash equivalents of $23.8 million as of December 31, 2021 and $59.5 million as of December 31, 2020.