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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Accumulated Other Comprehensive Income |
Schedule of changes in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Unrealized |  | ​ | ​ |  | ​ | ​
​ | ​ | Gain (Loss) on | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Marketable | ​ | Foreign | ​ | ​ | ​
​ | ​ | Securities | ​ | Currency Items | ​ | Total
​ | ​ | (In thousands)
Balance at December 31, 2020 | ​ | $ | (7) | ​ | $ | 2,596 | ​ | $ | 2,589
Other comprehensive loss | ​ | ​ | (695) | ​ | ​ | — | ​ | ​ | (695)
Balance at December 31, 2021 | ​ | $ | (702) | ​ | $ | 2,596 | ​ | $ | 1,894
​

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