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

Share capital - Narrative (Details)

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Share capital - Narrative (Details)
12 Months Ended 44 Months Ended
Dec. 12, 2019
USD ($)
$ / shares
shares
Nov. 19, 2019
shares
Sep. 13, 2019
USD ($)
$ / shares
shares
May 06, 2019
shares
Apr. 29, 2019
USD ($)
shares
Apr. 29, 2019
CAD ($)
shares
Nov. 30, 2018
USD ($)
$ / shares
shares
Feb. 05, 2018
shares
May 02, 2016
USD ($)
shares
May 02, 2016
CAD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2019
shares
Dec. 31, 2019
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
shares
Dec. 31, 2017
shares
Disclosure of classes of share capital [line items]                                  
Share issue related cost                     $ 13,629,000            
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                           111,798,000      
Number of share options available for issue in share-based payment arrangement | $ / shares                     13,975,000            
Number of stock options outstanding (in shares)                       7,591,000   6,172,000   7,822,000 4,864,000
Percent of share options outstanding in share-based payment arrangement                     5.50%   5.50%        
Granted pursuant to Section 613(c) of TSX manual (in shares) | shares                     1,600,000 0          
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)                     $ 8.45 $ 0.00          
Number of share options forfeited in share-based payment arrangement | shares                     309,000 0          
Granted pursuant to Stock Option Plan (in shares) | shares   50,000                 2,520,000 3,003,000          
Expense from share-based payment transactions with employees                     $ 7,414,000 $ 6,860,000          
Expected 10% increase in volatility would increase stock compensation expense                             $ 371,000    
Expected 10% increase in volatility would decrease stock compensation expense                             $ 381,000    
Public Offering                                  
Disclosure of classes of share capital [line items]                                  
Number of shares issued | shares 12,782,439                                
Share issuance, price per share (in dollars per share) | $ / shares $ 15.00                                
Net proceeds from commons shared issued $ 191,737,000                   179,918,000 0          
Share issue related cost $ 11,819,000                                
Commission rate to allocate share issue costs 6.00%                                
Share issuance costs, underwriting commission $ 11,504,000                                
Commission paid for legal and other professional fees $ 315,000                                
September 2019 At-The-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Number of shares issued | shares     2,345,250                            
Net proceeds from commons shared issued     $ 15,010,000                            
Share issue related cost     $ 640,000                            
Commission rate to allocate share issue costs     3.00%                            
Share issuance costs, underwriting commission     $ 450,000                            
Commission paid for legal and other professional fees     190,000                            
November 2018 At-the-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Number of shares issued | shares             4,608,000                    
Net proceeds from commons shared issued             $ 30,000,000                    
Share issue related cost             $ 1,170,000                    
Commission rate to allocate share issue costs             3.00%                    
Share issuance costs, underwriting commission             $ 900,000                    
Commission paid to placement agents and filing             270,000                    
Common shares | September 2019 At-The-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Controlled equity offering     $ 40,000,000                            
Common shares | November 2018 At-the-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Controlled equity offering             $ 30,000,000                    
Research and Development Expense                                  
Disclosure of classes of share capital [line items]                                  
Expense from share-based payment transactions with employees                     2,693,000 2,697,000          
Corporate, Administration and Business Development Expense                                  
Disclosure of classes of share capital [line items]                                  
Expense from share-based payment transactions with employees                     $ 4,721,000 $ 4,163,000          
Weighted average | September 2019 At-The-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Share issuance, price per share (in dollars per share) | $ / shares     $ 6.40                            
Weighted average | November 2018 At-the-Market Facility                                  
Disclosure of classes of share capital [line items]                                  
Share issuance, price per share (in dollars per share) | $ / shares             $ 6.51                    
Chief executive officer                                  
Disclosure of classes of share capital [line items]                                  
Granted pursuant to Section 613(c) of TSX manual (in shares) | shares         1,600,000 1,600,000                      
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)         $ 6.28 $ 8.45                      
Share options pursuant to Section 613(c) of TSX manual in share-based payment arrangement expiration period         10 years 10 years                      
Granted pursuant to Stock Option Plan (in shares) | shares         1,600,000 1,600,000   400,000                  
Advisor                                  
Disclosure of classes of share capital [line items]                                  
Share options granted vesting period       12 months                          
Number of share options forfeited in share-based payment arrangement | shares       100,000                          
Granted pursuant to Stock Option Plan (in shares) | shares       100,000                          
New Employee                                  
Disclosure of classes of share capital [line items]                                  
Granted pursuant to Section 613(c) of TSX manual (in shares) | shares                 200,000 200,000              
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 $ 3.66              
Share options pursuant to Section 613(c) of TSX manual in share-based payment arrangement expiration period                 5 years 5 years              
Share options pursuant to Section 613(c) of TSX manual in share-based payment arrangement vesting period                 36 months 36 months              
Number of share options exercised in period pursuant to Section 613(c) of TSX manual in share-based payment arrangement | shares                         150,000        
Number of share options outstanding pursuant to Section 613(c) of TSX manual in share-based payment arrangement | shares                               50,000  
Tranche one                                  
Disclosure of classes of share capital [line items]                                  
Vesting period of options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement         1 year 1 year                      
Tranche one | Chief executive officer                                  
Disclosure of classes of share capital [line items]                                  
Award vesting percentages of options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement         25.00% 25.00%                      
Share options granted vesting period                     12 months            
Tranche two | Chief executive officer                                  
Disclosure of classes of share capital [line items]                                  
Award vesting percentages of options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement         75.00% 75.00%                      
Vesting period of options granted pursuant to Section 613 (c) of TSX manual in share-based payment arrangement         36 months 36 months                      
Share options granted vesting period                     36 months