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Employee benefits - Movements in the fair value of plan assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee benefits    
Balance at beginning of year $ 4,307 $ 4,065
Interest income 60 31
Remeasurements gain :    
-Return on plan assets excluding interest income 31 305
Actual benefits paid (17)  
Effect of changes in exchange rate 1 (94)
Balance at end of year $ 4,382 $ 4,307