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Related party transactions - Narrative (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
Total employee benefits recognized in general and administrative expenses, employee benefit plan expenses, and share-based payments $ 30,728 $ 29,202