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Convertible Notes - Additional Information (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 1 Months Ended 2 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Oct. 22, 2020
USD ($)
$ / shares
Sep. 30, 2020
CAD ($)
Jun. 05, 2020
CAD ($)
$ / shares
shares
Jun. 05, 2020
USD ($)
$ / shares
shares
Aug. 14, 2019
CAD ($)
$ / shares
Jul. 31, 2019
CAD ($)
May 31, 2019
CAD ($)
Dec. 31, 2020
CAD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2018
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
shares
Dec. 31, 2018
CAD ($)
Tranche
$ / shares
shares
Dec. 31, 2018
USD ($)
Tranche
$ / shares
shares
Jun. 05, 2020
$ / shares
Dec. 31, 2019
USD ($)
shares
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Term debt facility amount     $ 73,200                            
Secured convertible note converted to common shares     $ 73,200         $ 73,200       $ 73,227          
Conversion price per common share | $ / shares                               $ 1.00  
Indebtedness under unsecured convertible notes       $ 3.0                          
Principal balance of secured convertible note convertible to common shares $ 10.0                                
Conversion price | $ / shares $ 0.1624                                
Weighted average price of common shares eight consecutive trading days volume, percentage 92.00%                                
Percentage of outstanding common shares 9.99%                                
Weighted average conversion price | $ / shares               $ 0.2468                  
Issuance of common shares | shares               296,700,000                  
Unsecured senior subordinated convertible notes convertible to common shares       $ 18.0                          
Purchase warrants to acquire common shares | shares     14,500,000 14,500,000                          
Initial exercise price of common share | $ / shares                               0.9338  
Proceeds from closure of private placement                     $ 27,764 $ 18,070 $ 90,373        
Issue of convertible notes                     $ 3,232            
Convertible debt converted into shares         $ 6,900                        
Conversion of debt conversion price | $ / shares         $ 13.84                        
Percentage of debt converted into shares         80.00%                        
Number of closed tranches of private placement | Tranche                           3 3    
Private placement of note, percentage                           12.00% 12.00%    
Proceeds from private placement of notes                           $ 28,900      
Number of each convertible into units consisting of common shares | shares                           1.6 1.6    
Number of each convertible into units consisting of common share purchase warrant | shares                           0.8 0.8    
Convertible notes maturing period                           12 months 12 months    
Convertible notes allocated to equity                           $ 3,200      
Convertible notes, principal amount                         21,200       $ 2.5
Convertible notes, principal amount repaid to unit holders                         $ 1,000       $ 2.4
Convertible Notes                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Interest rate                     12.00%     12.00% 12.00%    
Issue of convertible notes                     $ 3,232            
Interest rate payable, percent                     12.00%     12.00% 12.00%    
Directors and Officers                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Issue of convertible notes                           $ 7,000      
Agent Warrants                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Purchase warrants to acquire common shares | shares     1,080,000 1,080,000                          
Initial exercise price of common share | $ / shares                               $ 1.00  
Ordinary Shares                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Equity units issued | shares                         6,200,000       6,200,000
Warrants                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Equity units issued | shares                         3,600,000       3,600,000
Top of Range                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Purchase warrants to acquire common shares amount     $ 17,500                            
Exercise price per warrant | $ / shares       $ 1.00                          
Indebtedness under unsecured convertible notes   $ 3,000 3,000                            
Common share purchase warrant holding period                           12 months 12 months    
Secured Convertible Note Warrants | Top of Range                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Purchase warrants to acquire common shares amount     $ 17,500                            
Exercise price per warrant | $ / shares       $ 1.20                          
Secured Convertible Note                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Maturity     June 5, 2022 June 5, 2022                          
Issue of convertible notes     $ 73,200                            
Unsecured Convertible Notes                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Secured convertible note converted to common shares                   $ 18.0              
Maturity     June 5, 2022 June 5, 2022                          
Conversion price | $ / shares     $ 0.1624                            
Percentage of outstanding common shares     9.99% 9.99%                          
Weighted average conversion price | $ / shares                 $ 0.2348                
Issuance of common shares | shares                   76,700,000              
Weighted average price of common shares five consecutive trading days lowest volume, percentage     88.00% 88.00%                          
8% Senior Unsecured Convertible Notes                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Interest rate             8.00%                    
Proceeds from closure of private placement             $ 92,600                    
Issue of convertible notes           $ 600             $ 93,192        
Interest rate payable, percent             8.00%                    
8% Senior Unsecured Convertible Notes | Directors and Officers                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Issue of convertible notes           $ 100                      
CAD Offering                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Proceeds from private placement of notes                           $ 22,200      
USD Offering                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Proceeds from private placement of notes                             $ 5.0    
CAD Denominated Convertible Notes                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Offering convertible price per unit | $ / shares                           $ 3.91      
USD Denominated Convertible Notes                                  
Disclosure Of Detailed Information Of Convertible Notes [Line Items]                                  
Offering convertible price per unit | $ / shares                             $ 3.13