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Employee benefits - Movements in present value of the defined benefit obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Employee benefits    
Balance at beginning of year $ 3,562 $ 3,142
Service costs   6
Interest expense 15 27
Actuarial loss (gain) arising from:    
-Changes in demographic assumptions 32 91
-Experience adjustment 116 56
-Change in financial assumptions (253) 196
Effect of changes in exchange rates 17 44
Balance at end of year $ 3,489 $ 3,562