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Related party transactions - Summary of Information about Key Management Personnel Remuneration (Detail) - Directors [Member] - USD ($)
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Disclosure of transactions between related parties [line items]      
Salaries $ 231,034 $ 104,310 $ 55,938
Share-based compensation 74,320 149,993 36,212
Fees and benefits 411,184 159,881 39,428
Total $ 716,538 $ 414,184 $ 131,578