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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statement [line items] |  |  |
Interest income | $ (8,746) | $ (4,813) | $ (876)
Cost of revenues | 681,931 | 714,233 | 798,519
Sales and marketing | 23,856 | 25,459 | 23,080
Defined Benefit Plan |  |  |
Statement [line items] |  |  |
Current service costs | 5 | 4 |
Interest income | (18) | (4) | (2)
Cost of revenues |  | 3 | 6
Research and development | (13) | $ (3) | (8)
Total Expenses | $ (13) |  | $ (2)

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