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Net loss per share - Disclosure of detailed information of earnings per share explanatory (Details) - CAD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Earnings Per Share [Abstract]    
Net loss $ (234,195) $ (105,587)
Basic weighted average number of common shares outstanding 151,266,000 156,617,000
Dilutive effect of share options 0 0
Diluted weighted average number of common shares 151,266,000 156,617,000
Net loss per share    
Basic and diluted (in dollars per share) $ (1.55) $ (0.67)