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Share capital - Schedule of reconciliation of the share capital (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]    
Beginning balance $ 51,032,428 $ 12,413,399
Shares issued 11,539,417 47,853,745
Share issuance costs   (6,634,405)
Reverse acquisition   10,012,779
Share based payments 16,061,319 6,440,406
Share options exercised 732,598 2,857,050
Warrants exercised 94,991 800,078
Ending balance 48,222,087 51,032,428
Class A shares    
Disclosure of classes of share capital [line items]    
Beginning balance $ 201,500 $ 201,500
Beginning balance (shares) 72 72
Ending balance $ 201,500 $ 201,500
Ending balance (shares) 72 72
Class B shares    
Disclosure of classes of share capital [line items]    
Beginning balance $ 67,916,302 $ 12,794,963
Beginning balance (shares) 6,843,780 3,794,846
Shares issued $ 11,539,417 $ 47,853,745
Shares issued (shares) 408,651 2,268,035
Issued on acquisition of net assets of Prismic Pharmaceuticals, Inc $ 16,431,818  
Issued on acquisition of net assets of Prismic Pharmaceuticals, Inc (shares) 510,940  
Share issuance costs   $ (6,634,405)
Reverse acquisition   $ 9,868,179
Reverse acquisition (shares)   545,505
Warrant valuations   $ (2,366,670)
Share options exercised $ 1,782,438 $ 5,145,825
Share options exercised (shares) 130,189 190,463
Warrants exercised $ 145,174 $ 1,254,665
Warrants exercised (shares) 12,167 44,931
Ending balance $ 97,815,149 $ 67,916,302
Ending balance (shares) 7,905,727 6,843,780
Warrants    
Disclosure of classes of share capital [line items]    
Beginning balance $ 4,442,145 $ 2,116,900
Beginning balance (shares) 546,212 354,996
Issued on acquisition of net assets of Prismic Pharmaceuticals, Inc $ 1,888,086  
Issued on acquisition of net assets of Prismic Pharmaceuticals, Inc (shares) 67,598  
Reverse acquisition   $ 118,875
Reverse acquisition (shares)   37,313
Warrant valuations   $ 2,366,670
Warrant valuations (shares)   198,835
Share based payments   $ 294,287
Warrants exercised $ (50,183) $ (454,587)
Warrants exercised (shares) (12,167) (44,932)
Warrants expired $ (535,014)  
Warrants expired (shares) (134,192)  
Ending balance $ 5,745,034 $ 4,442,145
Ending balance (shares) 467,451 546,212