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Loss per share (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Earnings per share [line items]    
Antidilutive securities 1,560,783 1,728,597
Share options    
Earnings per share [line items]    
Antidilutive securities 1,516,641 1,692,347
DSUs    
Earnings per share [line items]    
Antidilutive securities 44,142 36,250