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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Amortized |  | Unrealized
​ |  | Market value |  | cost basis |  | loss, net
​ | ​ | (In thousands)
December 31, 2022: |  | ​ |  |  | ​ |  |  | ​ |
Current assets | ​ | $ | 33,147 | ​ | $ | 33,164 | ​ | $ | (17)
​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
December 31, 2023: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current assets | ​ | $ | 35,354 | ​ | $ | 35,359 | ​ | $ | (5)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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