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Other income, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Other income, net |
Schedule of components of other income, net | The components of other income, net are summarized below (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended
​ | ​ | December 31,
​ | ​ | 2021 |  | 2020 |  | 2019
Foreign exchange gain (loss) | ​ | $ | (434) | ​ | $ | (411) | ​ | $ | 321
Income from local China government subsidy | ​ | ​ | 1,125 | ​ | ​ | 3,800 | ​ | ​ | 808
Other expense | ​ | ​ | (182) | ​ | ​ | (189) | ​ | ​ | (182)
​ | ​ | $ | 509 | ​ | $ | 3,200 | ​ | $ | 947
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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