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Derivative Warrant Liabilities - Series A and Series B Warrants - Additional Information (Details)
$ / shares in Units, $ in Millions
 2 Months Ended 4 Months Ended 12 Months Ended
Aug. 20, 2020
shares
Aug. 19, 2020
shares
Aug. 18, 2020
$ / shares
shares
Dec. 31, 2020
shares
$ / shares
Dec. 31, 2020
CAD ($)
shares
$ / shares
Dec. 31, 2020
shares
$ / shares
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items]            
Warrants term           5 years
Issuance of common shares       296,700,000    
Warrants outstanding       2,080,000 2,080,000 2,080,000
Series A Warrants            
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items]            
Number of warrants issued     40,100,000      
Warrants exercise price | $ / shares     $ 0.75 $ 0.1766 $ 0.1766 $ 0.1766
Warrants exercised         39,600,000  
Weighted average exercise price of warrants | $ / shares         $ 0.1766  
Issuance of common shares         39,600,000  
Gross proceeds from exercise of warrants | $         $ 9.1  
Warrants outstanding       500,000 500,000 500,000
Series B Warrants            
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items]            
Number of warrants issued     14,300,000      
Warrants exercise price | $ / shares     $ 0.0001      
Warrants exercised 5,100,000 9,200,000        
Series A and Series B Warrants            
Disclosure Of Detailed Information About Derivative Warrant Liability [Line Items]            
Warrants term     5 years