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Employee benefits - Movements in present value of the defined benefit obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Employee benefits    
Balance at beginning of year $ 3,489 $ 3,562
Service costs 4  
Interest expense 27 15
Actuarial loss (gain) arising from:    
-Changes in demographic assumptions 24 32
-Experience adjustment 167 116
-Change in financial assumptions (551) (253)
Effect of changes in exchange rates (100) 17
Balance at end of year $ 3,060 $ 3,489