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Income Taxes - Summary of Income Tax Expense (Recovery) (Details) - CAD ($) $ in Thousands | 10 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Income Taxes [Line Items] |  |  |
Loss before taxes | $ (56,526) | $ (206,317) | $ (146,307)
Income Tax Expense Recovery |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Loss before taxes | $ (56,526) | $ (206,317) | $ (146,307)
Statutory income tax rates | 27.00% | 24.00% | 26.50%
Expected income tax recovery | $ (15,262) | $ (49,516) | $ (38,771)
Non-deductible share-based compensation | 1,860 | 1,970 | 10,474
Non-deductible finance expense | 2,304 | 2,130 | 15,981
Other non-deductible expenses |  | 348 | 2,621
Change in tax rates |  | 1,528 | 3,305
Deferred tax benefits not recognized | $ 11,098 | $ 43,540 | 2,781
Income tax (recovery) expense |  |  | $ (3,609)

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