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Financial Instruments And Risk Management - Summary of Detailed Information About Significant Undiscounted Commitments (Detail)
$ in Thousands
Dec. 31, 2021
CAD ($)
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows $ 84,778
Less than 1 year  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 8,847
1 to 3 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 75,931
4 to 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Over 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Trade And Other Payables  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 7,499
Trade And Other Payables | Less than 1 year  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 7,499
Trade And Other Payables | 1 to 3 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Trade And Other Payables | 4 to 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Trade And Other Payables | Over 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Convertible debentures [member]  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 72,011
Convertible debentures [member] | Less than 1 year  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Convertible debentures [member] | 1 to 3 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 72,011
Convertible debentures [member] | 4 to 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Convertible debentures [member] | Over 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Lease Liabilities  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 5,268
Lease Liabilities | Less than 1 year  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 1,348
Lease Liabilities | 1 to 3 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 3,920
Lease Liabilities | 4 to 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows 0
Lease Liabilities | Over 5 years  
Disclosure of maturity analysis for derivative financial liabilities [line items]  
Derivative financial liabilities, undiscounted cash flows $ 0