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Compensation of key management (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Salaries and short-term employee benefits $ 11,412 $ 6,841
Share-based payments 2,920 4,881
Key management personnel compensation $ 14,332 $ 11,722