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Convertible Debentures - Additional Information (Detail)
 12 Months Ended
Jul. 21, 2017
CAD ($)
shares
Jul. 21, 2017
USD ($)
shares
Jun. 10, 2016
CAD ($)
shares
Jun. 10, 2016
USD ($)
shares
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 21, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Jun. 10, 2016
USD ($)
Convertible debentures [line items]                        
Convertible debenture issuance costs             $ 2,811,146          
Establishment fee, percent 3.00% 3.00%                    
Mark to market loss (gain) on convertible debentures         $ 32,578,261   $ (27,522,985)          
Interest rate         7.50%   7.50% 7.50% 7.50%      
Borrowings, interest rate, payable in cash             5.00%   5.00%      
Borrowings, interest rate, payable in common shares             2.50%   2.50%      
2016 Debentures [member]                        
Convertible debentures [line items]                        
Gross proceeds from issuance of convertible debentures     $ 76,416,000 $ 60,000,000                
Net proceeds from issuances of convertible debentures     72,363,602 56,852,383                
Convertible debenture issuance costs     $ 4,052,398 $ 3,147,617                
Establishment fee, percent     3.00% 3.00%                
Establishment fee     $ 2,292,480 $ 1,800,000                
Establishment fee (shares) | shares     1,005,586 1,005,586                
Convertible debentures at fair value     $ 74,123,520   $ 72,481,375   $ 90,742,373 $ 53,131,047 $ 72,333,498   $ 70,811,801 $ 58,200,000
Gains (losses) recognised in profit or loss, fair value measurement, liabilities         18,260,998 $ 19,202,451            
Convertible debt, conversion price               2.3261 2.3261      
2017 Debentures [member]                        
Convertible debentures [line items]                        
Gross proceeds from issuance of convertible debentures $ 75,294,000 $ 60,000,000                    
Net proceeds from issuances of convertible debentures 72,482,854 57,759,864                    
Convertible debenture issuance costs $ 2,811,146 $ 2,240,136                    
Establishment fee, percent 3.00% 3.00%                    
Establishment fee $ 2,258,820 $ 1,800,000                    
Establishment fee (shares) | shares 869,271 869,271                    
Convertible debentures at fair value $ 73,035,180       65,709,509   80,627,593 48,167,064 64,270,700 $ 58,200,000 $ 73,035,180  
Gains (losses) recognised in profit or loss, fair value measurement, liabilities         14,918,084 $ 16,103,636            
Mark to market gain related to the change in fair value         33,179,082   27,522,985          
Mark to market loss (gain) on convertible debentures         (32,578,261)   27,522,985          
Mark to market gain loss on convertible debentures in other comprehensive income         $ 600,821   $ 0          
Convertible debt, conversion price               $ 2.6919 $ 2.6919