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Investment securities | 3 Months Ended
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Mar. 31, 2024
Investment securities |
Investment securities |
4 | Investment securities
The following tables summarize the Company’s investments in sovereign debt as of March 31, 2024 and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ The Company invests in short-term U.S. and European government bonds with the highest investment credit rating. The U.S. and European government bonds are U.S. dollar and euro denominated, respectively. ​ Inputs to the fair value of the investments are considered Level 2 inputs.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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