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

Warrant Liability - Summary of Warrant Liability (Detail)

v3.19.1
Warrant Liability - Summary of Warrant Liability (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]    
Number of Warrants, Opening Balance 4,933,231 2,581,703
Number of Warrants, exercised (6,500) (1,755,141)
Number of Warrants, expired   (688,826)
Number of Warrants, Ending Balance 13,901,859 4,933,231
Warrant liability, Opening Balance $ 17,849,460 $ 2,365,691
Warrant liability, exercised (28,949) (7,953,581)
Warrant liability, expired 0 0
Warrant liability, Foreign exchange adjustment during the year (984,462) 305,475
Warrant liability, Fair value adjustment during the year (17,095,220) 12,423,889
Warrant liability, Ending Balance $ 11,250,167 $ 17,849,460
Issue of warrants expiring, March 16, 2019 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring   357,787
Warrant liability, expiring   $ 572,326
Issue of warrants expiring, March 16, 2021 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring   357,787
Warrant liability, expiring   $ 725,484
Issue of warrants expiring, June 29, 2022 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring   1,983,521
Warrant liability, expiring   $ 3,364,118
Issue of warrants expiring, August 24, 2022 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring   563,067
Warrant liability, expiring   $ 822,372
Issue of warrants expiring, December 5, 2022 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring   1,533,333
Warrant liability, expiring   $ 5,223,686
Issue of warrants expiring, April 10, 2023 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring 1,295,554  
Warrant liability, expiring $ 5,212,087  
Issue of warrants expiring, August 10, 2023 [member]    
Disclosure of classes of share capital [line items]    
Number of Warrants, expiring 7,679,574  
Warrant liability, expiring $ 6,297,251