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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	Sep. 30, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Line Items]
Amortized Cost	$ 1,489,899	$ 366,111
Gross Unrealized Gains	1,458	341
Gross Unrealized Losses	(99)	(171)
Estimated Fair Value	1,491,258	366,281
Cash and money market funds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	301,408	33,204
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	301,408	33,204
Corporate Notes And Bonds [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	3,479	45,823
Gross Unrealized Gains	4	22
Gross Unrealized Losses	0	(53)
Estimated Fair Value	3,483	45,792
U.S. Government Corporations and Agencies Securities [Member]
Cash and Cash Equivalents [Line Items]
Amortized Cost	1,185,012	287,084
Gross Unrealized Gains	1,454	319
Gross Unrealized Losses	(99)	(118)
Estimated Fair Value	$ 1,186,367	$ 287,285

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