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Other operating expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Net impairment loss on trade receivables $ 98 $ 103
Restructuring expense 507 799
Other operating expense 605 902
Impairment loss on trade receivables $ 98 $ 103