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Employee benefits - Movements in the fair value of plan assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Employee benefits    
Balance at beginning of year $ 3,565 $ 3,410
Interest income 140 57
Remeasurements gain (loss):    
-Return on plan assets excluding interest income 120 81
Contributions paid by the employer 56 132
Refund of overfunding (70)  
Effect of changes in exchange rate (81) (115)
Balance at end of year $ 3,730 $ 3,565