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	Jun. 30, 2024	Dec. 31, 2023
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 405,728	$ 460,303
Gross Unrealized Gains	0	349
Gross Unrealized Losses	(1,321)	(2,306)
Estimated Fair Value	404,407	458,346
Cash and money market funds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	29,656	25,131
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	29,656	25,131
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	0	16,374
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(14)
Estimated Fair Value	0	16,360
Corporate Notes And Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	92,259	176,793
Gross Unrealized Gains	0	38
Gross Unrealized Losses	(797)	(1,854)
Estimated Fair Value	91,462	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	283,813	237,015
Gross Unrealized Gains	0	311
Gross Unrealized Losses	(524)	(395)
Estimated Fair Value	$ 283,289	$ 236,931