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Subsequent Events - Additional Information (Details)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Mar. 15, 2021
USD ($)
Feb. 23, 2021
CAD ($)
$ / shares
shares
Feb. 22, 2021
USD ($)
$ / shares
shares
Feb. 12, 2021
$ / shares
Feb. 10, 2021
USD ($)
$ / shares
shares
Feb. 04, 2021
USD ($)
$ / shares
shares
Feb. 02, 2021
USD ($)
$ / shares
shares
Dec. 11, 2020
Aug. 20, 2020
shares
Aug. 19, 2020
shares
Aug. 18, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
$ / shares
shares
Dec. 04, 2020
USD ($)
Dec. 31, 2020
$ / shares
Feb. 16, 2021
CAD ($)
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Price per unit | $ / shares                       $ 0 $ 0   $ 0  
Gross proceeds from offering | $                     $ 20.0          
Term of warrants                             5 years  
Issuance of common shares | shares                         296,700,000      
Gross proceeds from issuance of common shares | $                       $ 75.0   $ 49.9    
NASDAQ                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Additional period allowed to regain compliance with listing qualifications               180 days                
Regain compliance with listing qualifications initial period date       Feb. 01, 2021                        
Regain compliance with listing qualifications initial end date       Feb. 12, 2021                        
Series A Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares                     25,800,000          
Price per unit | $ / shares                     $ 0.50          
Series B Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares                     14,300,000          
Price per unit | $ / shares                     $ 0.50          
Series A Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares                     0.75          
Series B Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares                     $ 0.0001          
Warrants exercised | shares                 5,100,000 9,200,000            
Issuance of common shares | shares                 5,100,000 9,200,000            
January 2021 Units Offering | Series A Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares             100,000,000                  
Description of offering units             series A units (the “Series A Units”), each consisting of one common share and one-half series A warrant (collectively, the “Series A Warrants”) to purchase one common share                  
Sale price per unit | $ / shares             $ 0.75                  
January 2021 Units Offering | Series B Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares             33,300,000                  
Description of offering units             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-half Series A Warrant to purchase one common share                  
Sale price per unit | $ / shares             $ 0.75                  
January 2021 Units Offering | Series A and series B units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Gross proceeds from offering | $             $ 100.0                  
January 2021 Units Offering | Top of Range | Series A and series B units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Price per unit | $ / shares             $ 0.0001                  
January 2021 Units Offering | Series A and Series B Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Term of warrants                             5 years  
January 2021 Units Offering | Series A Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares             0.80                  
Warrants exercised | shares     63,300,000   3,300,000                      
Issuance of common shares | shares     63,300,000   3,300,000                      
Weighted average warrant exercise price | $ / shares     $ 0.80   $ 0.80                      
Gross proceeds from warrants | $     $ 50.7   $ 2.7                      
January 2021 Units Offering | Series B Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares             $ 0.0001                  
Warrants exercised | shares             33,300,000                  
Issuance of common shares | shares             33,300,000                  
February 2021 Units Offering                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Term of warrants                             5 years  
February 2021 Units Offering | Series A Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares           60,500,000                    
Description of offering units           additional series A units (the “Additional Series A Units”), each consisting of one common share and one-half additional series A warrant (collectively, the “Additional Series A Warrants”) to purchase one common share                    
Sale price per unit | $ / shares           $ 1.00                    
February 2021 Units Offering | Series B Units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Number of units issued | shares           14,000,000                    
Description of offering units           additional series B units (the “Additional Series B Units”), each consisting of one pre-funded additional series B warrant (the “Additional Series B Warrants”) to purchase one common share and one-half Additional Series A Warrant to purchase one common share                    
Sale price per unit | $ / shares           $ 1.00                    
February 2021 Units Offering | Series A and series B units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Gross proceeds from offering | $           $ 74.5                    
February 2021 Units Offering | Top of Range | Series A and series B units                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Price per unit | $ / shares           $ 0.0001                    
February 2021 Units Offering | Series A Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares           1.10                    
Warrants exercised | shares     35,000,000   2,300,000                      
Issuance of common shares | shares     35,000,000   2,300,000                      
Weighted average warrant exercise price | $ / shares     $ 1.10   $ 1.10                      
Gross proceeds from warrants | $     $ 38.5   $ 2.5                      
February 2021 Units Offering | Series B Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Warrant exercise price | $ / shares           $ 0.0001                    
Warrants exercised | shares           14,000,000                    
Issuance of common shares | shares           14,000,000                    
Registered Offerings | Warrants                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Term of warrants     42 months                          
Warrant exercise price | $ / shares     $ 1.50                          
Number of common stock shares issuable upon conversion of warrants | shares     1                          
Number of warrants issued | shares     98,300,000                          
Minimum Bid Price Requirement | NASDAQ                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Regain compliance with listing qualifications common stock minimum bid price | $ / shares       $ 1.00                        
Number of consecutive business period to maintain minimum bid closing price       10 days                        
Strategic Investment | Indiva                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Announced strategic value investment | $                               $ 22
Strategic Investment | Indiva | Brokered Private Placement                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Issuance of common shares | shares   25,000,000                            
Common shares issued price per share | $ / shares   $ 0.44                            
Gross proceeds from issuance of common shares | $   $ 11                            
Cash out flow for non-revolving loan issuance | $   $ 11                            
Joint Venture | SunStream Bancorp Inc.                                
Disclosure Of Nonadjusting Events After Reporting Period [Line Items]                                
Percentage of joint venture ownership 50.00%                              
Initial commitment amount | $ $ 100.0