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 ($)
$ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Short term investments      
Beginning balance of short term investments $ 7,833 $ 7,833 $ 0
Cash flow - Purchases   36,084 97,996
Cash flow - Disposals   (36,093) (90,018)
Non-cash changes - Fair value adjustments     (78)
Non-cash changes - Opening adjustment on change in accounting policy 78    
Non-cash changes - Other   (13) (67)
Ending balance of short term investments   7,889 7,833
Contingent consideration      
Beginning balance contingent consideration (3,792) (3,792) (5,440)
Contingent consideration milestones paid   0 2,150
Fair value adjustment contingent consideration   (236) (502)
Ending balance contingent consideration   (4,028) (3,792)
Derivative warrants      
Cash flow - Proceeds from exercise derivative warrants   0 8,684
Common shares      
Beginning balance common shares (499,200) (499,200)  
Cash flow - Net proceeds from public offering   0 162,324
Cash flow - Proceeds from exercise warrants   3,071 232
Cash flow - Proceeds from exercise options   943 3,912
Ending balance common shares   (504,650) (499,200)
Warrants      
Warrants (906) (906)  
Warrants   0 (906)
Capital reserve [Abstract]      
Beginning balance capital reserve (18,360) (18,360)  
Non-cash changes - Stock Based Compensation   6,860 4,242
Ending balance capital reserve   (24,690) (18,360)
Common shares      
Common shares      
Beginning balance common shares (499,200) (499,200) (299,815)
Cash flow - Net proceeds from public offering     (162,324)
Cash flow - Proceeds from exercise derivative warrants     (8,684)
Cash flow - Proceeds from exercise warrants   (3,071) (232)
Cash flow - Proceeds from exercise options   (943) (3,912)
Non-cash changes - Conversion to Common Shares   (1,436) (21,334)
Non-cash changes - Fair value adjustments     (2,899)
Ending balance common shares   (504,650) (499,200)
Warrants      
Warrants      
Warrants (906) (906) (971)
Non-cash changes - Conversion to Common Shares   906 65
Warrants   0 (906)
Contributed surplus      
Capital reserve [Abstract]      
Beginning balance capital reserve (18,360) (18,360) (17,017)
Non-cash changes - Conversion to Common Shares   530 2,899
Non-cash changes - Stock Based Compensation   (6,860) (4,242)
Ending balance capital reserve   (24,690) (18,360)
Derivative warrants December 28, 2016      
Derivative warrants      
Beginning balance derivative warrant liabilities (8,948) (8,948) (7,405)
Cash flow - Proceeds from exercise derivative warrants     8,596
Non-cash changes - Conversion to Common Shares     3,825
Non-cash changes - Fair value adjustments   (6,527) (17,808)
Non-cash changes - Other     3,844
Ending balance derivative warrant liabilities   (15,475) (8,948)
Derivative warrants February 14, 2014      
Derivative warrants      
Beginning balance derivative warrant liabilities $ (2,845) (2,845) (1,733)
Cash flow - Proceeds from exercise derivative warrants     88
Non-cash changes - Conversion to Common Shares     8,760
Non-cash changes - Fair value adjustments   (3,427) (10,973)
Non-cash changes - Other     1,013
Ending balance derivative warrant liabilities   $ (6,272) $ (2,845)