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Convertible Debentures - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 10, 2021
CAD ($)
shares
Jun. 10, 2021
CAD ($)
shares
Feb. 23, 2021
CAD ($)
shares
Feb. 18, 2021
CAD ($)
shares
Feb. 03, 2021
CAD ($)
shares
Dec. 10, 2020
CAD ($)
shares
Aug. 18, 2020
CAD ($)
$ / shares
shares
Aug. 18, 2020
USD ($)
shares
Jun. 08, 2020
CAD ($)
shares
May 27, 2020
CAD ($)
shares
May 27, 2020
USD ($)
shares
Dec. 31, 2021
CAD ($)
$ / shares
shares
Dec. 31, 2020
CAD ($)
$ / shares
Feb. 23, 2021
$ / shares
Feb. 18, 2021
$ / shares
Aug. 18, 2020
USD ($)
shares
Convertible debentures [line items]                                
Mark to market loss (gain) on convertible debentures                       $ (75,123,000) $ (76,493,000)      
Sale of stock issue price per share | shares     22,289,088 25,794,247                        
Stock issued during period shares | shares 36,818 40,829     200,000 856,206     1,092,142              
Stock issued during value $ 202,000 $ 238,000     $ 900,000 $ 2,585,000     $ 2,152,000     $ 1,289,000 4,737,000      
2016 Debentures [member]                                
Convertible debentures [line items]                                
Convertible debt, conversion price | $ / shares                           $ 2.33 $ 4.69  
2017 Debentures [member]                                
Convertible debentures [line items]                                
Convertible debt, conversion price | $ / shares                           $ 2.69 $ 4.88  
2020 Debentures [member]                                
Convertible debentures [line items]                                
Gross proceeds from issuance of convertible debentures                   $ 20,889,000 $ 15,000   20,901,000      
Establishment fee, percent                   3.00% 3.00%          
Establishment fee                   $ 627,000 $ 450          
Establishment fee (shares) | shares                   348,350 348,350          
Interest rate                   7.50% 7.50%          
Borrowings, interest rate, payable in cash                   5.00% 5.00%          
Borrowings, interest rate, payable in common shares                   2.50% 2.50%          
Stock shares issued during the period value                   $ 20,262,000 $ 14,550   $ 348,350,000      
Convertible debentures term                       3.41 years 4.41 years      
Stock issued during period shares | shares                   77,647 77,647          
Stock issued during value                   $ 440,000     $ 627,000      
Interest expense on bonds                   943,000 $ 750          
Convertible debt, conversion price | $ / shares                       $ 2.34 $ 2.34      
2020 Debentures [member] | Convertible Debenture Consent Fee [member]                                
Convertible debentures [line items]                                
Issue of equity                   $ 355,000            
Sale of stock issue price per share | shares                   180,270 180,270          
ISO Energy Debentures [member]                                
Convertible debentures [line items]                                
Gross proceeds from issuance of convertible debentures             $ 7,902,000 $ 6,000                
Establishment fee, percent             3.00% 3.00%                
Establishment fee             $ 272,000 $ 180                
Establishment fee (shares) | shares             219,689 219,689                
Debentures increased             $ 7,630,000                  
Convertible debentures face value                               $ 6,000
Convetible debentures conversion price per share | $ / shares             $ 0.88                  
Number of common shares issuable upon conversion of debentures. | shares             9,206,311                 9,206,311
Convertible debentures term                       3.6 years 4.6 years      
Interest expense                       $ 249,000        
Interest payment settled In cash                       $ 174,000        
Convertible debt, conversion price | $ / shares                       $ 0.88 $ 0.88      
ISO Energy Debentures [member] | Queens Road Capital Investment Limited [Member]                                
Convertible debentures [line items]                                
Stock issued during period shares | shares                       40,026        
2017 Debentures [member]                                
Convertible debentures [line items]                                
Comprehensive income (loss)                       $ 336,000 $ 2,888,000      
Debentures increased                       72,011,000        
Gains (losses) recognised in profit or loss, fair value measurement, liabilities                       75,123,000 76,493,000      
Mark to market loss (gain) on convertible debentures                       75,459,000 79,381,000      
Debentures increased                         226,853,000      
Interest expense on convertible debentures                       $ 3,729,000 $ 13,371,000      
2016 and 2017 Debentures [member]                                
Convertible debentures [line items]                                
Gross proceeds from issuance of convertible debentures     $ 105,242,000 $ 125,059,000                        
Debentures increased       $ 60,000                        
Interest rate                       7.50%        
Convertible debentures term                       July 22, 2022        
Sale of stock issue price per share | shares     22,289,088 25,794,247                        
Stock issued during period related to accrued interest | shares     89,729                          
Stock issued during period related to unpaid interest | shares     87,316                          
Stock issued during period value related to accrued And Unpaid Interest     $ 849,000                 $ 407,000        
Loss on conversion reclassified to accumulated deficit     $ 4,016,000                          
2016 and 2017 Debentures [member] | Convertible Debenture Consent Fee [member]                                
Convertible debentures [line items]                                
Sale of stock issue price per share | shares                   180,270 180,270          
Stock issued during value                   $ 355,000