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Loss per share (Tables)
 6 Months Ended 12 Months Ended
Apr. 30, 2022
Oct. 31, 2021
Statement [Line Items]    
Summary of Weighted Average Number of Ordinary Shares  
     Year Ended October 31,  
    
2021
      2020      2019  
Net loss
   
$
(226,559,288
) 
    $ (9,275,962 )     $ (4,100,782 ) 
Weighted average number of ordinary shares
   
 
110,119,135
 
      82,571,828        71,891,372  
    
 
 
     
 
 
     
 
 
  
Basic and diluted loss per share
   
$
(2.06
) 
    $ (0.11 )     $ (0.06 ) 
    
 
 
     
 
 
     
 
 
  
Summary of Anti Dilutive Potential Ordinary Shares Excluded from Weighted Average Number of Ordinary Shares   The following potential common shares are anti-dilutive and are therefore excluded from the weighted average number of common shares for the purpose of diluted earnings per share:
 
     Year Ended October 31,  
    
2021
      2020      2019  
Stock options
   
 
5,296,553
 
      5,327,985        3,991,000  
Warrants
   
 
22,999,894
 
      —          —    
Convertible debt
   
 
7,493,795
 
      —
  
        536,231  
Restricted share units
   
 
716,763
 
      87,084        —    
    
 
 
     
 
 
     
 
 
  
    
 
36,507,005
 
      5,415,069        4,527,231  
    
 
 
     
 
 
     
 
 
  
Summary of earnings per share
     Three months ended April 30,      Six months ended April 30,  
    
2022
      2021     
2022
      2021  
Net profit (loss)
   
$
(20,650,375
) 
    $ (7,848,142 )    
$
7,896,265
 
    $ (14,693,465 ) 
Weighted average number of common shares
   
 
168,971,679
 
      95,060,429     
 
166,365,628
 
      94,254,557  
    
 
 
     
 
 
     
 
 
     
 
 
  
Effect of dilutive securities
                                    
Stock options
   
 
—  
 
      —       
 
3,840,066
 
      —    
Restricted share units
   
 
—  
 
      —       
 
1,493,766
 
      —    
Convertible debt
   
 
—  
 
      —       
 
—  
 
      —    
Warrants
   
 
—  
 
      —       
 
1,097
 
      —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Effect of dilutive securities
   
 
—  
 
      —       
 
5,334,929
 
      —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Dilutive number of shares
   
 
168,971,679
 
      95,060,429     
 
171,700,557
 
      94,254,557  
    
 
 
     
 
 
     
 
 
     
 
 
  
Basic earnings (loss) per share
   
$
(0.12
) 
    $ (0.08 )    
$
0.05
 
    $ (0.16 ) 
Diluted earnings (loss) per share
   
$
(0.12
) 
    $ (0.08 )    
$
0.05
 
    $ (0.16 ) 
    
 
 
     
 
 
     
 
 
     
 
 
  
The following table represents
instruments that could potentially dilute basic earnings per share in the future, but were not included in the calculation of diluted earnings per share because they are antidilutive for the periods presented:
 
    
April 30,
      April 30,  
    
2022
      2021  
Stock options
   
 
1,085,571
 
      6,415,533  
Convertible debt
   
 
7,917,948
 
      —    
    
 
 
     
 
 
  
    
 
9,003,519
 
      6,415,533