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Investment securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Investment securities |
Schedule of investments in sovereign debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At March 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) | ​ | $ | 312,621 | ​ | $ | 12 | ​ | $ | — | ​ | $ | 312,633
Total | ​ | $ | 312,621 | ​ | $ | 12 | ​ | $ | — | ​ | $ | 312,633
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2023
​ | ​ | Amortized cost | ​ | Gross unrealized holding gains | ​ | Gross unrealized holding losses | ​ | Estimated fair value
​ | ​ | (in thousands)
Current investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities (held-to-maturity) | ​ | $ | 376,532 | ​ | $ | 139 | ​ | $ | — | ​ | $ | 376,671
Total | ​ | $ | 376,532 | ​ | $ | 139 | ​ | $ | — | ​ | $ | 376,671

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