Fair Value Measurements - Summary of Company's Investments (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Schedule Of Available For Sale Securities [Line Items]
Investments, Amortized cost	$ 166,967	$ 166,143
Investments, Gross unrealized gains	1,538	1,074
Investments, Gross unrealized losses	(33)	(1,957)
Investments, Fair value	168,472	165,260
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Securities available-for-sale, Amortized Cost	56,460	55,447
Securities available-for-sale, Gross unrealized gains	300	88
Securities available-for-sale, Gross unrealized losses	(12)	(427)
Securities available-for-sale, Fair value	56,748	55,108
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost	100,270	100,484
Trading securities, Gross unrealized gains	254	86
Trading securities, Gross unrealized losses	(21)	(1,525)
Trading securities, Fair value	100,503	99,045
Mutual Funds Held In Rabbi Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost	10,237	10,212
Trading securities, Gross unrealized gains	984	900
Trading securities, Gross unrealized losses	0	(5)
Trading securities, Fair value	$ 11,221	$ 11,107