Fair Value Measurements - Summary of Company's Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Investments, Amortized cost	$ 36,357	$ 34,935
Investments, Gross unrealized gains		1,254
Investments, Gross unrealized losses	(3,063)	(111)
Investments, Fair value	33,294	36,078
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost	24,883	24,994
Trading securities, Gross unrealized losses	(445)	(111)
Trading securities, Fair value	24,438	24,883
Mutual Funds Held In Rabbi Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost	11,474	9,941
Trading securities, Gross unrealized gains		1,254
Trading securities, Gross unrealized losses	(2,618)
Trading securities, Fair value	$ 8,856	$ 11,195