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Financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Current financial liabilities at fair value through profit or loss $ 0 $ 24
Foreign exchange forward [member]    
Disclosure of financial instruments [Line Items]    
Current financial liabilities at fair value through profit or loss $ 0 $ 24