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Financial Instruments - Summary of Movement in Allowance for Impairment in Respect of Accounts Receivable (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Instruments [Abstract]    
Balance, beginning of year $ 752  
Net remeasurement of impairment loss allowance (632) $ 752
Balance, end of year $ 120 $ 752