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Share Capital and Warrants - Additional Information (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 20, 2021
USD ($)
$ / shares
shares
Jan. 13, 2021
USD ($)
$ / shares
shares
Jan. 11, 2021
USD ($)
Dec. 04, 2020
USD ($)
Aug. 20, 2020
shares
Aug. 19, 2020
shares
Aug. 18, 2020
USD ($)
$ / shares
shares
Aug. 13, 2020
USD ($)
Aug. 01, 2019
Dec. 31, 2020
USD ($)
$ / shares
shares
Apr. 30, 2019
CAD ($)
shares
Dec. 31, 2020
CAD ($)
shares
Dec. 04, 2020
USD ($)
$ / shares
shares
Mar. 17, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
CAD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Jul. 22, 2019
Dec. 31, 2018
CAD ($)
Feb. 28, 2018
CAD ($)
Share Capital And Warrants [Line Items]                                            
Price per unit/common share | $ / shares                                   $ 0        
Share split ratio                                       1.6    
Description of offering                             On August 18, 2020, the Company issued 25.8 million Series A Units (the “Series A Units”), each consisting of one common share and one Series A Warrant (collectively, the “Series A Warrants”) (note 17d) to purchase one common share and 14.3 million Series B Units (the “Series B Units”), each consisting of one pre-funded Series B Warrant (the “Series B Warrants”) to purchase one common share and one Series A Warrant to purchase one common share (note 17d).              
Gross proceeds from offering | $             $ 20,000,000                              
Term of warrants                             5 years              
Issuance of common shares                       296,700,000                    
Number of shares issued                   156.3     153.5                  
Weighted average exercise price | $ / shares                   $ 0.4795     $ 0.3250                  
Gross proceeds from offering of ATM program | $                   $ 75,000,000     $ 49,900,000                  
Carrying Amount warrants | $                       $ 269,695     $ 269,695 $ 221,198         $ (7,908) $ 13,710
Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrants description                             During the year ended December 31, 2020, the warrants issued upon conversion of the CAD and USD denominated convertible notes expired, and the 40% Warrants and 60% Warrants issued as part of the term debt financing were surrendered and cancelled.              
Warrants exercised                               4,551,082 4,551,082          
Warrants expired                     662       3,232,434 662 662          
Carrying Amount warrants | $                     $ 3,900 $ 6,138     $ 6,138 $ 27,831         $ 3,108  
Major Ordinary Share Transactions                                            
Share Capital And Warrants [Line Items]                                            
Number of shares issued 237.7 72.4                       117.6                
Weighted average exercise price | $ / shares $ 0.6325 $ 0.6903                       $ 0.6379                
Gross proceeds from offering of ATM program | $ $ 150,300,000 $ 50,000,000                       $ 75,000,000                
Top of Range                                            
Share Capital And Warrants [Line Items]                                            
Aggregate offering price | $       $ 150,000,000       $ 50,000,000                            
Top of Range | Major Ordinary Share Transactions                                            
Share Capital And Warrants [Line Items]                                            
Aggregate offering price | $ $ 400,000,000   $ 50,000,000                                      
Series A Units                                            
Share Capital And Warrants [Line Items]                                            
Price per unit/common share | $ / shares             $ 0.50                              
Number of units issued             25,800,000                              
Series B Units                                            
Share Capital And Warrants [Line Items]                                            
Price per unit/common share | $ / shares             $ 0.50                              
Number of units issued             14,300,000                              
Reduction of price per unit from price per unit sold | $ / shares             $ 0.0001                              
60% Warrants                                            
Share Capital And Warrants [Line Items]                                            
Percentage of warrants                 60.00%           60.00%              
40% Warrants                                            
Share Capital And Warrants [Line Items]                                            
Percentage of warrants                 40.00%           40.00%              
Series A Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrant exercise price | $ / shares             0.75                              
Series B Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrant exercise price | $ / shares             $ 0.0001                              
Warrants exercised         5,100,000 9,200,000                                
Issuance of common shares         5,100,000 9,200,000                                
Exercise Price of $3.91 | Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrant exercise price | $ / shares                               $ 3.91            
Warrants exercised                               4,211,242 4,211,242          
Gross proceeds from warrants | $                               $ 16,500            
CAD Denominated Convertible Notes | Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrant exercise price | $ / shares                               $ 4.38            
Warrants exercised                               307,840 307,840          
Gross proceeds from warrants | $                               $ 1,300            
USD Denominated Convertible Notes | Warrants                                            
Share Capital And Warrants [Line Items]                                            
Warrant exercise price | $ / shares                                     $ 3.75      
Warrants exercised                               32,000 32,000          
Gross proceeds from warrants | $                                 $ 120,000