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

Derivative warrant liabilities - Summary of derivative warrant liabilities (Details)

v3.19.3.a.u2
Derivative warrant liabilities - Summary of derivative warrant liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in derivative financial liabilities [Roll Forward]    
Beginning balance of derivative financial liabilities $ 21,747  
Ending balance of derivative financial liabilities $ 29,353 $ 21,747
Warrants    
Changes in warrants [Roll Forward]    
Beginning balance of warrants outstanding (in shares) 5,261,000 5,261,000
Conversion to equity (common shares) upon exercise of warrants (in shares) (3,570,000)  
Ending balance of warrants outstanding (in shares) 1,691,000 5,261,000
Changes in derivative financial liabilities [Roll Forward]    
Beginning balance of derivative financial liabilities $ 21,747 $ 11,793
Conversion to equity (common shares) upon exercise of warrants (33,518)  
Revaluation of derivative warrant liability upon exercise of warrants 181  
Revaluation of derivative warrant liability 40,943 9,954
Ending balance of derivative financial liabilities $ 29,353 $ 21,747
Warrants | Bought Deal Public Offering    
Changes in warrants [Roll Forward]    
Beginning balance of warrants outstanding (in shares) 3,523,000 3,523,000
Conversion to equity (common shares) upon exercise of warrants (in shares) (1,832,000)  
Ending balance of warrants outstanding (in shares) 1,691,000 3,523,000
Changes in derivative financial liabilities [Roll Forward]    
Beginning balance of derivative financial liabilities $ 15,475 $ 8,948
Conversion to equity (common shares) upon exercise of warrants (27,598)  
Revaluation of derivative warrant liability upon exercise of warrants (182)  
Revaluation of derivative warrant liability 41,658 6,527
Ending balance of derivative financial liabilities $ 29,353 $ 15,475
Warrants | February 14, 2014 Warrants    
Changes in warrants [Roll Forward]    
Beginning balance of warrants outstanding (in shares) 1,738,000 1,738,000
Conversion to equity (common shares) upon exercise of warrants (in shares) (1,738,000)  
Ending balance of warrants outstanding (in shares) 0 1,738,000
Changes in derivative financial liabilities [Roll Forward]    
Beginning balance of derivative financial liabilities $ 6,272 $ 2,845
Conversion to equity (common shares) upon exercise of warrants (5,920)  
Revaluation of derivative warrant liability upon exercise of warrants 363  
Revaluation of derivative warrant liability (715) 3,427
Ending balance of derivative financial liabilities $ 0 $ 6,272