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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)

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of earnings per share when the basic and diluted measurements are equal. [Refer: Basic earnings (loss) per share; Diluted earnings (loss) per share]

+ References

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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