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Convertible debentures (Details) - CAD ($)
$ in Thousands
Dec. 31, 2020
May 27, 2020
Dec. 31, 2019
Convertible Debentures [Line Items]      
Convertible debentures $ 12,621   $ 12,621
Transaction costs (796) $ (796) (1,318)
Net proceeds 11,825   11,303
Conversion of debentures to equity (net of $184 unamortized transaction cost) (3,754)    
Accretion in carrying value of debenture liability 1,228   1,786
Accrued interest 684   1,381
Interest converted in shares and paid (615)   (1,276)
Convertible debentures Net book value 9,368   $ 13,194
Liability component of convertible debentures [Member]      
Convertible Debentures [Line Items]      
Convertible debentures 11,963    
Transaction costs (755)    
Net proceeds 11,208    
Conversion of debentures to equity (net of $184 unamortized transaction cost) (3,754)    
Accretion in carrying value of debenture liability 1,228    
Accrued interest 684    
Interest converted in shares and paid (615)    
Convertible debentures Net book value 8,751    
Equity component of convertible debentures [Member]      
Convertible Debentures [Line Items]      
Convertible debentures 658    
Transaction costs (41)    
Net proceeds 617    
Convertible debentures Net book value $ 617