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v3.25.2

Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investment securities |
Schedule of investments in government debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At June 30, 2025
​ |  | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
​ | ​ | (in thousands)
Current investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities (held-to-maturity) | ​ | $ | 123,196 | ​ | $ | 168 | ​ | $ | — | ​ | $ | 123,364
Total | ​ | $ | 123,196 | ​ | $ | 168 | ​ | $ | — | ​ | $ | 123,364
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2024
​ |  | Amortized cost |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value
​ | ​ | (in thousands)
Current investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities (held-to-maturity) | ​ | $ | 208,591 | ​ | $ | 164 | ​ | $ | — | ​ | $ | 208,755
Total | ​ | $ | 208,591 | ​ | $ | 164 | ​ | $ | — | ​ | $ | 208,755

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