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Long term debt - Convertible Debenture (Details)
12 Months Ended
Mar. 15, 2017
CAD
CAD / shares
Dec. 31, 2017
CAD
Dec. 31, 2016
CAD
Debt Instrument [Line Items]      
Payments of financing fees   CAD 2,982,000 CAD 99,000
Convertible subordinated debentures      
Debt Instrument [Line Items]      
Face amount of long term debt CAD 40,000,000.0    
Conversion interest rate 5.50%    
Conversion price (in CAD per share) | CAD / shares CAD 10.85    
Conversion ratio 0.0921659    
Threshold percentage of share price for conversion 125.00%    
Redemption price as a percentage of the principal amount 101.00%    
Payments of financing fees   CAD 2,142,000