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

Share capital - Stock options and compensation expense narrative (Details)

v3.19.1
Share capital - Stock options and compensation expense narrative (Details)
$ / shares in Thousands
12 Months Ended
Jun. 08, 2016
May 02, 2016
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2018
shares
Dec. 31, 2016
shares
Disclosure of stock options granted [Line Items]                
Expense from share-based payment transactions with employees     $ 6,860,000 $ 4,242,000        
Increase (decrease) in percent of share options issued in share-based payment arrangement 12.50%              
Number of share options issued and outstanding in share-based payment arrangement | $ / shares         85,500      
Number of share options available for issue in share-based payment arrangement | $ / shares     10,688          
Number of share options outstanding in share-based payment arrangement       4,864,000 7,427   7,591,000 4,052,000
Percent of share options outstanding in share-based payment arrangement     8.70%          
Number of share options granted pursuant to Section 613(c) of TSX manual in share-based payment arrangement   200,000            
Information About How Expected Ten Percent Increase in Volatility, Would Increase On Share Options Granted, Expense Amount           $ 308,000    
Information About How Expected Ten Percent Decrease in Volatility, Would Decrease On Share Options Granted, Expense Amount           $ 265,000    
Share options pursuant to Section 613(c) of TSX manual in share-based payment arrangement vesting period   36 months            
Share options pursuant to Section 613(c) of TSX manual in share-based payment arrangement expiration period   5 years            
Number of share options exercised pursuant to Section 613(c) of TSX manual in share-based payment arrangement | shares     20,000 16,000        
Shares issued pursuant to Section 613(c) of TSX manual in share-based payment arrangement outstanding | shares             164,000  
Bottom of range                
Disclosure of stock options granted [Line Items]                
Percent of share options issued in share-based payment arrangement 10.00%              
Top of range                
Disclosure of stock options granted [Line Items]                
Percent of share options issued in share-based payment arrangement 12.50%              
United States of America, Dollars                
Disclosure of stock options granted [Line Items]                
Weighted average exercise price of share options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement (in dollars per share)   $ 2.92            
Canada, Dollars                
Disclosure of stock options granted [Line Items]                
Weighted average exercise price of share options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement (in dollars per share)   $ 3.66            
Research and Development Expense                
Disclosure of stock options granted [Line Items]                
Expense from share-based payment transactions with employees     $ 2,697,000 $ 993,000        
Corporate, Administration and Business Development Expense                
Disclosure of stock options granted [Line Items]                
Expense from share-based payment transactions with employees     $ 4,163,000 $ 3,249,000