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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investment securities |
Schedule of investments into sovereign debt | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2022
​ | ​ | Amortized cost, as adjusted | ​ | Gross unrealized holding gains | ​ | Gross unrealized holding losses | ​ | Estimated fair value
​ | ​ | (in thousands)
Current investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of governmental agencies (held-to-maturity) | ​ | $ | 124,831 | ​ | $ | — | ​ | $ | (283) | ​ | $ | 124,548
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-current investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of governmental agencies (held-to-maturity) | ​ | ​ | 39,984 | ​ | ​ | — | ​ | ​ | (43) | ​ | ​ | 39,941
Total | ​ | $ | 164,815 | ​ | $ | — | ​ | $ | (326) | ​ | $ | 164,489
​

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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