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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity |
Schedule of the changes in the balances of each component of AOCI, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​
​ | ​ | Foreign | ​ | on Available | ​ | ​ | ​
​ | ​ | Currency | ​ | for Sale | ​ | ​ | ​
​ |  | Translation |  | Securities |  | Total
​ | ​ | (in thousands)
Balance - December 31, 2017 | ​ | $ | 1,839 | ​ | $ | (27) | ​ | $ | 1,812
Other comprehensive income (loss) | ​ | ​ | (3) | ​ | ​ | 11 | ​ | ​ | 8
Balance - December 31, 2018 | ​ | ​ | 1,836 | ​ | ​ | (16) | ​ | ​ | 1,820
Other comprehensive income (loss) | ​ | ​ | 25 | ​ | ​ | 49 | ​ | ​ | 74
Balance - December 31, 2019 | ​ | ​ | 1,861 | ​ | ​ | 33 | ​ | ​ | 1,894
Other comprehensive income (loss) | ​ |  | 5 | ​ |  | (53) | ​ |  | (48)
Balance - December 31, 2020 | ​ | $ | 1,866 | ​ | $ | (20) | ​ | $ | 1,846

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