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

Subsequent events (Details)

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Subsequent events (Details)
2 Months Ended 12 Months Ended
Nov. 19, 2019
shares
Mar. 05, 2020
USD ($)
shares
Mar. 05, 2020
CAD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Disclosure of non-adjusting events after reporting period [line items]            
Exercised (in shares)       3,580,000 276,000  
Granted pursuant to Stock Option Plan (in shares) 50,000     2,520,000 3,003,000  
Exercise price of options granted (in dollars per share) | $       $ 6.14 $ 5.29  
Common shares            
Disclosure of non-adjusting events after reporting period [line items]            
Number of shares issued       111,798,000 85,500,000 84,052,000
Major ordinary share transactions            
Disclosure of non-adjusting events after reporting period [line items]            
Exercised (in shares)   499,000 499,000      
Proceeds from issuing shares | $   $ 1,974,000        
Granted pursuant to Stock Option Plan (in shares)   1,867,000 1,867,000      
Exercise price of options granted (in dollars per share)   $ 18.66 $ 24.64      
Major ordinary share transactions | Common shares            
Disclosure of non-adjusting events after reporting period [line items]            
Number of shares issued   499,000 499,000