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Investments - Debt Securities, Available-For-Sale (Detail)
$ in Thousands
Jun. 30, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Amortized Cost $ 291,074
Gross Unrealized Gains 6,252
Fair Value 297,326
U.S government securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Amortized Cost 291,074
Gross Unrealized Gains 6,252
Fair Value $ 297,326