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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

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