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

Supplementary cash flow information - Changes in Investing and Financing Activities (Details)

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Supplementary cash flow information - Changes in Investing and Financing Activities (Details) - USD ($)
12 Months Ended
Dec. 12, 2019
Dec. 31, 2019
Dec. 31, 2018
Short term investments      
Beginning balance of short term investments   $ 7,889,000 $ 7,833,000
Cash flow - Purchases   0 36,084,000
Cash flow - Proceeds from short term investment   (7,884,000) (36,093,000)
Non-cash changes - Opening adjustment on change in accounting policy     78,000
Non-cash changes - Other   (5,000) (13,000)
Ending balance of short term investments   0 7,889,000
Common shares      
Beginning balance common shares   (504,650,000)  
Cash flow - Proceeds from exercise of options   13,748,000 943,000
Ending balance common shares   (790,472,000) (504,650,000)
Warrants      
Warrants    
Warrants  
Capital reserve [Abstract]      
Beginning balance capital reserve   (24,690,000)  
Non-cash changes - Stock Based Compensation   (7,414,000) (6,860,000)
Ending balance capital reserve   (23,655,000) (24,690,000)
Common shares      
Common shares      
Beginning balance common shares   (504,650,000) (499,200,000)
Cash flow - Proceeds from exercise of derivative warrants   (6,989,000) (3,071,000)
Cash flow - Proceeds from exercise of options   (13,748,000) (943,000)
Non-cash changes - Conversion to Common Shares   (41,967,000) (1,436,000)
Ending balance common shares     (504,650,000)
Warrants      
Warrants      
Warrants   0 (906,000)
Non-cash changes - Conversion to Common Shares     906,000
Warrants   0 0
Contributed surplus      
Capital reserve [Abstract]      
Beginning balance capital reserve   (24,690,000) 18,360,000
Non-cash changes - Conversion to Common Shares   8,449,000 530,000
Non-cash changes - Stock Based Compensation   (7,414,000) 6,860,000
Ending balance capital reserve   (23,655,000) (24,690,000)
Derivative warrants December 28, 2016      
Derivative warrants      
Beginning balance derivative warrant liabilities   (15,475,000) (8,948,000)
Non-cash changes - Conversion to common shares   27,598,000  
Non-cash changes - Fair value adjustments   (41,476,000) (6,527,000)
Ending balance derivative warrant liabilities   (29,353,000) (15,475,000)
Derivative warrants February 14, 2014      
Derivative warrants      
Beginning balance derivative warrant liabilities   (6,272,000) (2,845,000)
Non-cash changes - Conversion to common shares   5,920,000  
Non-cash changes - Fair value adjustments   352,000 (3,427,000)
Ending balance derivative warrant liabilities   0 (6,272,000)
Public Offering      
Common shares      
Cash flow - Proceeds from exercise options $ 191,737,000 179,918,000 0
Public Offering | Common shares      
Common shares      
Cash flow - Proceeds from exercise options   (179,918,000)  
ATM Facility      
Common shares      
Cash flow - Proceeds from exercise options   43,200,000 $ 0
ATM Facility | Common shares      
Common shares      
Cash flow - Proceeds from exercise options   $ (43,200,000)