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Investment securities | 12 Months Ended
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Dec. 31, 2022
Investment securities |
Investment securities | 5. Investment securities ​ The following table summarizes the Company’s investments into sovereign debt as of December 31, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ No investments classified as held-to-maturity were purchased in the prior years. 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 -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI https://asc.fasb.org/topic&trid=75115024 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI https://asc.fasb.org/topic&trid=2197064 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI https://asc.fasb.org/topic&trid=2196965 + Details
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