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, 2019
Dec. 31, 2018
Earnings per share [line items]    
Anti-dilutive securities 9,513 12,852
Stock options    
Earnings per share [line items]    
Anti-dilutive securities 7,822 7,591
Warrants (derivative liabilities)    
Earnings per share [line items]    
Anti-dilutive securities 1,691 5,261