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Financial instruments (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Nominal amount $ 0 $ 1,274
Fair Value, Asset 0 0
Fair Value, Liability 0 24
Forward foreign exchange [Member]    
Disclosure of financial instruments [Line Items]    
Nominal amount 0 1,274
Fair Value, Asset 0 0
Fair Value, Liability $ 0 $ 24