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

Net loss per common share - Anti-dilutive securities (Details)

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Net loss per common share - Anti-dilutive securities (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [line items]    
Anti-dilutive securities 3,987 4,269
Stock options    
Earnings per share [line items]    
Anti-dilutive securities 1,567 1,222
Warrants (derivative liabilities)    
Earnings per share [line items]    
Anti-dilutive securities 2,420 2,415
Warrants (equity)    
Earnings per share [line items]    
Anti-dilutive securities 0 632