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Equity Method Investments - Share of associates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Method Investments      
The Company's share of losses of associates $ (477) $ (1,095) $ (1,200)
The Company's share of other comprehensive income (loss) of associates 26 (68) 106
The Company's share of total comprehensive income (loss) of associates $ (451) $ (1,163) $ (1,094)