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Share-based compensation - Additional information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
component
Dec. 31, 2019
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of components of share-based compensation plan | component 4  
Share-based compensation (Note 14) | $ $ 1,619 $ 659
Number of common shares reserved for issuance 2,845,420  
Restricted Stock Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding (in shares) 0 0
Performance Share Units    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding (in shares) 0 0