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Equity Method Investments - Share of associates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investments      
The Company's share of losses of associates $ (638) $ (477) $ (1,095)
The Company's share of other comprehensive income (loss) of associates 58 26 (68)
The Company's share of total comprehensive income (loss) of associates $ (580) $ (451) $ (1,163)