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Nature of business - Schedule of ownership percentage in subsidiaries (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
FV Pharma Inc.    
Disclosure of subsidiaries [line items]    
Country Canada  
Ownership percentage 100.00% 100.00%
Prismic Pharmaceuticals Inc.    
Disclosure of subsidiaries [line items]    
Country USA  
Ownership percentage 100.00%