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Tax - Specification of temporary differences and deferred tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Temporary Differences And Deferred Tax [Abstract]      
Property, plant and equipment $ (164) $ (164) $ (89)
Pensions (539) (425) (225)
Total basis for deferred tax (703) (590) (314)
Deferred tax liability [1],[2] $ (155) $ (136) $ (75)
[1] Due to materiality, not recognized on a separate line in the statements of financial position.
[2] The general income tax rate is reduced from 23% to 22%, effective from fiscal year 2019, reduced from 24% to 23%, effective from fiscal year 2018 and reduced from 25% to 24%, effective from fiscal year 2017.