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Convertible debentures (Details) - CAD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Convertible debentures $ 12,621 $ 12,912
Transaction costs (1,318) (1,346)
Net proceeds 11,303 11,566
Accretion in carrying value of debenture liability 1,786 1,056
Interest payable 105 108
Accrued interest 1,276 1,291
Interest converted in shares and paid (1,276) (1,291)
Convertible debentures Net book value 13,194 $ 12,730
Liability component of convertible debentures [Member]    
Statement Line Items [Line Items]    
Convertible debentures 11,705  
Transaction costs (1,223)  
Net proceeds 10,482  
Accretion in carrying value of debenture liability 1,786  
Interest payable 105  
Accrued interest 1,276  
Interest converted in shares and paid (1,276)  
Convertible debentures Net book value 12,373  
Equity component of convertible debentures [Member]    
Statement Line Items [Line Items]    
Convertible debentures 916  
Transaction costs (95)  
Net proceeds 821  
Accretion in carrying value of debenture liability  
Interest payable  
Accrued interest  
Interest converted in shares and paid  
Convertible debentures Net book value $ 821