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Mainland China Contribution Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Contribution Plan [Abstract] |  |  |
Total provisions of employee benefits | $ 2,774 | $ 2,192 | $ 2,722

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- Definition Amount of expense for employee benefit and equity-based compensation. + References No definition available. + Details
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