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Tax - Specification of Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Income tax payable $ 132 $ 100 $ 119
Tax expenses related to previous year 8 (10) 3
Change in deferred tax (8) 4 7
Total income tax expense $ 131 $ 95 $ 128