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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, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [abstract]    
Salaries and other short-term employee benefits $ 6,364 $ 5,779
Employee benefit plan 337 301
Share based payments 8,468 8,643
Termination benefits 0 900
Compensation for key management personnel $ 15,169 $ 15,623