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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)