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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IFRS Statement [Line Items]      
Interest income $ 876 $ 967 $ 2,013
Cost of revenues 798,519 666,501 533,916
Sales and marketing 23,080 16,675 17,628
Defined Benefit Plan [Member]      
IFRS Statement [Line Items]      
Current service costs   6 26
Interest income (2) (4) (19)
Total Expenses (2) 2 7
Cost of revenues 6 6 6
Research and development (8) (5) 1
General and administrative   1  
Total Expenses $ (2) $ 2 $ 7