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Financial Instruments - Summary of Company's Foreign Currency Balances Subject to Exchange Risk (Details)
$ in Thousands
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CAD ($)
Feb. 28, 2018
CAD ($)
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Line Items]            
Cash and cash equivalents $ 60,376,000   $ 45,337,000   $ 14,121,000 $ 7,678,000
Foreign Currency Risk | USD            
Disclosure Of Nature And Extent Of Risks Arising From Financial Instruments [Line Items]            
Cash and cash equivalents   $ 1   $ 22,088    
Accounts payable and accrued liabilities   (206)   (2,150)    
Net foreign exchange exposure $ (261,000) (205) $ 25,895,000 19,938    
Translation to CAD 1.2732   1.2988      
CAD equivalent at period end exchange rate $ (261,000) $ (205) $ 25,895,000 $ 19,938