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Fair Value Measurement - Held-to-maturity debt securities at amortized cost (Details) - US Treasury Securities [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 71,705 | $ 106,535
Unrealized Gains | 10 | 37
Unrealized Losses | 0 | 0
Aggregate Fair Value | $ 71,715 | $ 106,572

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