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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