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Employee benefits - Expenses recognized in profit or loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statement [line items] |  |  |
Interest income | $ (4,813) | $ (876) | $ (967)
Cost of revenues | 714,233 | 798,519 | 666,501
Sales and marketing | 25,459 | 23,080 | 16,675
Cash award expenses |  |  |
Statement [line items] |  |  |
Cost of revenues | 505 | 511 |
General and administrative | 2,250 | 678 |
Sales and marketing | 4,147 | 1,223 |
Defined Benefit Plan |  |  |
Statement [line items] |  |  |
Current service costs | 4 |  | 6
Interest income | (4) | (2) | (4)
Total Expenses |  | (2) | 2
Cost of revenues | 3 | 6 | 6
Research and development | $ (3) | (8) | (5)
General and administrative |  |  | 1
Total Expenses |  | $ (2) | $ 2

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