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Financial Assets at Amortized Cost (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Assets at Amortized Cost |
Schedule of financial assets at amortized cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |  | December 31, | ​
​ |  | 2020 |  | 2021 |
​ | ​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Time deposit with original maturities more than three months | ​ | $ | 8,682 | ​ | 26,013 | ​

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