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

Share capital - Disclosure of shares issued (Details)

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Share capital - Disclosure of shares issued (Details) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of issued capital [Abstract]    
Equity, opening balance $ 165,743 $ 35,950
Opening adjustment on change in accounting policy (note 3)   173,104
Exercise of warrants 3,071 232
Exercise of derivative warrants   29,953
Exercise of stock options 943 3,912
Equity, closing balance $ 112,575 $ 165,743
Common shares    
Reconciliation of number of shares issued [Abstract]    
Number of shares issued, opening balance (in shares) 84,052 52,808
Issued pursuant to exercise of warrants (in shares) 1,172 85
Issued pursuant to exercise of derivative liability warrants (note 10) (in shares)   4,020
Issued pursuant to exercise of stock options (in shares) 276 1,494
Number of shares issued, closing balance (in shares) 85,500 84,052
Reconciliation of issued capital [Abstract]    
Equity, opening balance $ 499,200 $ 299,815
Opening adjustment on change in accounting policy (note 3)   173,104
Exercise of warrants 3,977 297
Exercise of derivative warrants   29,953
Exercise of stock options 1,473 6,811
Equity, closing balance $ 504,650 $ 499,200
Common shares | Public Offering    
Reconciliation of number of shares issued [Abstract]    
Number of shares issued during period (in shares)   25,645
Reconciliation of issued capital [Abstract]    
Opening adjustment on change in accounting policy (note 3)   $ 162,324