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Investments in Associates - Movements in Investments in Associates (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Significant Investments In Associates [Abstract]      
At January 1 $ 861 $ 786  
Share of loss of associates (3) (3) $ (710)
Exchange difference 6 78  
At December 31 $ 864 $ 861 $ 786