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Related parties - Remuneration (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party [Abstract]    
Short-term employee benefits $ 9,097 $ 6,829
Post-employment benefits 767 977
Other long-term employee benefits 50 52
Share-based compensation expense (recovery) 127 (4,725)
Total $ 10,041 $ 3,133