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Fair Value Measurement - Held-to-maturity debt securities at amortized cost (Details) - US Treasury Securities [Member] - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Amortized Cost $ 109,300 $ 129,113
Unrealized Gains 8 28
Unrealized Losses 0 0
Aggregate Fair Value $ 109,308 $ 129,141