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Investment securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Current investments: |  |
Amortized cost | $ 123,196 | $ 208,591
Gross unrealized holding gains | 168 | 164
Estimated fair value | 123,364 | 208,755
Investment securities with original maturities of less than 90 days when purchased and presented within cash and cash equivalents at amortized cost | 109,000 | 15,300
Government debt securities (held-to-maturity) |  |
Current investments: |  |
Amortized cost | 123,196 | 208,591
Gross unrealized holding gains | 168 | 164
Estimated fair value | $ 123,364 | $ 208,755

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