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Financial Instruments - Additional Information (Detail)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents $ 201,804      
Current liabilities $ 8,205   $ 7,322  
Convertible debentures, aggregate principal amount   $ 21   $ 21
Bottom of range [member]        
Disclosure of detailed information about financial instruments [line items]        
Borrowings, interest rate 7.50% 7.50%    
Top of range [member]        
Disclosure of detailed information about financial instruments [line items]        
Borrowings, interest rate 8.50% 8.50%    
Amounts held in foreign risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities, net $ 44,259      
Percentage of reasonably possible change in currency rates 10.00%      
Value at risk $ 5,611