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Employee benefits - Movements in present value of the defined benefit obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee benefits    
Balance at beginning of year $ 3,060 $ 3,489
Service costs 5 4
Interest expense 42 27
Actuarial loss (gain) arising from:    
-Changes in demographic assumptions   24
-Experience adjustment (20) 167
-Change in financial assumptions 42 (551)
Effect of changes in exchange rates (15) (100)
Balance at end of year $ 3,114 $ 3,060