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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]      
Interest expense (income) $ (2,013) $ (2,429) $ (2,225)
Cost of revenues 533,916 554,690 518,142
Research and development 114,859 123,037 117,662
Sales and marketing 17,628 20,380 20,388
Defined Benefit Plan [Member]      
IFRS Statement [Line Items]      
Current service costs 26 20 15
Interest expense (income) (19) 19 19
Total 7 39 34
Cost of revenues 6 14 9
Research and development 1 18 17
General and administrative   4 5
Sales and marketing   3 3
Total Expenses $ 7 $ 39 $ 34