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Other Financial Assets and Financial Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets $ 2,747 $ 3,261
Total current assets   187
Total non-current assets 2,747 3,074
Other financial liabilities 139  
Total current liabilities 139  
Financial liability at fair value through profit or loss, category [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial liabilities 139  
Foreign currency forward contracts [Member] | Financial liability at fair value through profit or loss, category [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial liabilities 139  
Financial assets at fair value through profit or loss, category [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets   187
Financial assets at fair value through profit or loss, category [Member] | Foreign currency forward contracts [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets   187
Held-to-maturity investments, category [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets   309
Held-to-maturity investments, category [Member] | Debt securities [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets   309
Available-for-sale financial assets [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets 2,747 2,765
Available-for-sale financial assets [Member] | Equity investments [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Other financial assets $ 2,747 $ 2,765