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Employee benefits - Movements in the fair value of plan assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee benefits    
Balance at beginning of year $ 3,730 $ 3,565
Interest income 31 140
Remeasurements gain (loss):    
-Return on plan assets excluding interest income 129 120
Contributions paid by the employer 15 56
Refund of overfunding   (70)
Effect of changes in exchange rate 47 (81)
Balance at end of year $ 3,952 $ 3,730