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	Mar. 31, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 438,609	$ 460,303
Gross Unrealized Gains	19	349
Gross Unrealized Losses	(1,754)	(2,306)
Estimated Fair Value	436,874	458,346
Cash and money market funds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	28,863	25,131
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	28,863	25,131
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	3,992	16,374
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(14)
Estimated Fair Value	3,989	16,360
Corporate Notes And Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	124,011	176,793
Gross Unrealized Gains	1	38
Gross Unrealized Losses	(1,250)	(1,854)
Estimated Fair Value	122,762	174,977
Municipal Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	0	4,990
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(43)
Estimated Fair Value	0	4,947
US government and agency
Cash and Cash Equivalents [Line Items]
Amortized Cost	281,743	237,015
Gross Unrealized Gains	18	311
Gross Unrealized Losses	(501)	(395)
Estimated Fair Value	$ 281,260	$ 236,931