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Equity Method Investments - Share of associates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity Method Investments      
The Company's share of losses of associates $ (1,392) $ (638) $ (477)
The Company's share of other comprehensive income of associates 55 58 26
The Company's share of total comprehensive income (loss) of associates $ (1,337) $ (580) $ (451)