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Employee benefit obligation - Carrying value of benefit obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increases    
Provisions for the year $ 670 $ 420
Interest expense 12 14
Benefit obligation    
Disclosure of defined benefit plans [line items]    
Opening balance 1,443 929
Increases    
Provisions for the year 670 420
Actuarial losses 108 110
Interest expense 12 14
Reductions    
Payments (41) (16)
Foreign exchange translation 138 (14)
Ending balance $ 2,330 $ 1,443