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Financial instruments and financial risk factors - Liabilities measured at fair value (Details) - Recurring fair value measurement - USD ($)
Oct. 31, 2022
Jul. 31, 2022
Oct. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   $ 46,156,445 $ 111,138,272
Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities $ 29,028,938 46,156,445  
Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 82,109,334    
Quoted prices in active markets for identical assets (Level 1)      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   0 53,549,990
Quoted prices in active markets for identical assets (Level 1) | Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 0 0  
Quoted prices in active markets for identical assets (Level 1) | Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 53,549,990    
Level 2      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   46,156,445 $ 57,588,282
Level 2 | Convertible debt      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 29,028,938 $ 46,156,445  
Level 2 | Warrants      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities $ 28,559,344