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Financial Instruments - Accumulated Unrealized Losses on Marketable Debt Securities in Continuous Loss Position (Detail) - U.S. Treasury securities
$ in Thousands
Jun. 30, 2026
USD ($)
Schedule Of Available For Sale Securities [Line Items]  
Less than 12 months, Estimated Fair Value $ 281,701
Less than 12 months, Gross Unrealized Losses (235)
More than 12 months, Estimated Fair Value 0
More than 12 months, Gross Unrealized Losses $ 0