Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Derivative warrant liabilities - Bought deal narrative (Details)

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Derivative warrant liabilities - Bought deal narrative (Details) - USD ($)
12 Months Ended
Dec. 28, 2016
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]      
Proceeds from exercise of derivative warrants   $ 6,989,000 $ 0
Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Derivative warrant liabilities $ 7,223,000    
Common units | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Net proceeds from commons shared issued $ 28,750,000    
Number of units issued 12,778,000    
Share issuance, price per share (in dollars per share) $ 2.25    
Common shares | Common units | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Private placement, number of shares per Unit 1    
Warrants | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Exercise price, price per unit (in dollars per share)   3.00  
Proceeds from exercise of derivative warrants   5,496,000  
Fair value of warrants on exercise dates   27,780,000  
Increase (decrease) through exercise of share purchase warrants   27,598,000  
Gains (losses) recognised in profit or loss, fair value measurement, liabilities   182,000  
Derivative warrant liabilities (note 10)   29,353,000 15,475,000
Revaluation of derivative warrant liability   41,476,000 $ 6,527,000
Sensitivity analysis for types of market risk, effect would increase fair value of derivative warrant liability   3,433,000  
Sensitivity analysis for types of market risk, effect would decrease fair value of derivative warrant liability   (3,433,000)  
Warrants | Common units | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Private placement, number of shares per Unit 0.50    
Warrant exercise period 5 years    
Exercise price, price per unit (in dollars per share) $ 3.00    
Other income (expense) | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Share issue related cost   $ 655,000