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Financial Assets and Financial Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial assets at fair value through other comprehensive income    
Financial assets at fair value through other comprehensive income $ 2,332  
Financial assets - available for sale    
Financial assets – available for sale   $ 2,747
Other financial assets 2,332 2,747
Financial liabilities at fair value through profit or loss    
Foreign exchange forward contracts $ 142 $ 139