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Income Taxes - Analysis of charge/(credit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Income taxes $ (1,557) $ (825) $ (735)
Total income taxes for the year (1,557) (825) (735)
Operating tax loss carry-forwards $ 3,800 $ 1,300 $ 100