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Employee benefits - Movements in the fair value of plan assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Employee benefits    
Balance at beginning of year $ 3,952 $ 3,730
Interest income 17 31
Remeasurements gain :    
-Return on plan assets excluding interest income 60 129
Contributions paid by the employer 20 15
Effect of changes in exchange rate 16 47
Balance at end of year $ 4,065 $ 3,952