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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, 2020
Dec. 31, 2019
IFRS Statement [Line Items]    
Balance at beginning of year $ 3,142 $ 3,184
Balance at end of year 3,562 3,142
Defined Benefit Plan [Member]    
IFRS Statement [Line Items]    
Balance at beginning of year (60) 129
Recognized during the period 176 (189)
Balance at end of year $ 116 $ (60)