Cash, Cash Equivalents, Restricted Cash And Investments - Summary of Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 460,303	$ 547,153
Gross Unrealized Gains	349	42
Gross Unrealized Losses	(2,306)	(7,397)
Estimated Fair Value	458,346	539,798
Cash and money market funds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	25,131	46,367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	25,131	46,367
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	16,374	130,141
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	(443)
Estimated Fair Value	16,360	129,698
Corporate Notes And Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	176,793	277,184
Gross Unrealized Gains	38	19
Gross Unrealized Losses	(1,854)	(5,993)
Estimated Fair Value	174,977	271,210
Municipal Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	4,990	9,905
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(43)	(273)
Estimated Fair Value	4,947	9,632
US Government Corporations and Agencies Securities [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	237,015	83,556
Gross Unrealized Gains	311	23
Gross Unrealized Losses	(395)	(688)
Estimated Fair Value	$ 236,931	$ 82,891