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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]      
Interest expense (income) $ (967) $ (2,013) $ (2,429)
Cost of revenues 666,501 533,916 554,690
Research and development 122,265 114,859 123,037
Sales and marketing 16,675 17,628 20,380
Defined Benefit Plan [Member]      
IFRS Statement [Line Items]      
Current service costs 6 26 20
Interest expense (income) (4) (19) 19
Total 2 7 39
Cost of revenues 6 6 14
Research and development (5) 1 18
General and administrative 1   4
Sales and marketing     3
Total Expenses $ 2 $ 7 $ 39