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Investments in Associates - Movements in Investments in Associates (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Significant Investments In Associates [Abstract]      
At January 1 $ 864 $ 861  
Share of loss of associates (3) (3) $ (3)
Exchange difference 74 6  
At December 31 $ 935 $ 864 $ 861