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Tax - Specification of income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]      
Income tax payable $ 74 $ 132 $ 100
Tax expenses related to previous year 1 8 (10)
Change in deferred tax 8 (8) 4
Total income tax expense $ 83 $ 131 $ 95