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Employee benefits - Remeasurement of net defined benefit liability recognized in other comprehensive income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]    
Balance at beginning of year $ 3,184 $ 4,460
Balance at end of year 3,142 3,184
Defined Benefit Plan [Member]    
IFRS Statement [Line Items]    
Balance at beginning of year 129 1,262
Recognized during the period (189) (1,133)
Balance at end of year $ (60) $ 129