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

Derivative warrant liabilities - Bought deal narrative (Details)

v3.19.1
Derivative warrant liabilities - Bought deal narrative (Details) - USD ($)
12 Months Ended
Dec. 28, 2016
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]      
Net proceeds from issuance of common shares   $ 0 $ 162,324,000
Proceeds from exercise of derivative warrants   $ 0 8,684,000
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 issuance of common shares $ 28,750,000    
Number of units issued 12,778,000    
Share issuance, price per share (in dollars per share) $ 2.25    
Common shares      
Disclosure of classes of share capital [line items]      
Net proceeds from issuance of common shares     $ (162,324,000)
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      
Disclosure of classes of share capital [line items]      
Number of warrants exercised   1,172,000 85,000
Revaluation of derivative warrant liability   $ 9,954,000 $ 28,781,000
Warrants | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Number of warrants exercised   0 2,865,000
Proceeds from exercise of derivative warrants     $ 8,596,000
Fair value of warrants on exercise dates     16,266,000
Increase (decrease) through exercise of share purchase warrants     12,421,000
Gains (losses) recognised in profit or loss, fair value measurement, liabilities     3,844,000
Derivative warrant liabilities (note 10)   $ 15,475,000 8,948,000
Revaluation of derivative warrant liability   6,527,000 17,808,000
Revaluation of derivative warrant liability   $ 6,527,000 17,808,000
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   3.00
Other income (expense) | Bought Deal Public Offering      
Disclosure of classes of share capital [line items]      
Share issue related cost     $ 655,000