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Related party transactions - Summary of Compensation Paid or Payable to Key Management (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [abstract]    
Salaries and other short-term employee benefits $ 5,779 $ 6,191
Employee benefit plan 301 268
Share based payments 8,643 4,906
Termination benefits 900 1,762
Compensation for key management personnel $ 15,623 $ 13,127