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Share-based compensation - Components (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation (Note 14) $ 1,619 $ 659
Stock options    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation (Note 14) 1,059 550
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation (Note 14) $ 560 $ 109