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Share Capital and Reserves - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Dec. 11, 2018
CAD ($)
shares
Dec. 06, 2018
CAD ($)
shares
Jun. 12, 2018
CAD ($)
shares
Jun. 11, 2018
CAD ($)
shares
Dec. 12, 2017
CAD ($)
shares
Dec. 11, 2017
CAD ($)
shares
Sep. 18, 2017
CAD ($)
shares
Jul. 21, 2017
CAD ($)
shares
Jul. 21, 2017
USD ($)
shares
Jun. 12, 2017
CAD ($)
shares
May 31, 2017
CAD ($)
shares
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Disclosure of classes of share capital [line items]                              
Common shares issued | shares                   327,863 5,714,286 10,458,334 10,458,334 1,424,445 1,424,445
Exercise of options                       $ 5,074,334   $ 1,128,032  
Exercise of options                       (5,074,334)   (1,128,032)  
Common shares issued | shares 693,994 693,994 745,378 745,378 555,670 555,670       327,863          
Issue of shares on convertible debenture interest payment $ 1,894,603 $ 1,894,603 $ 2,154,142 $ 2,154,142 $ 1,955,959 $ 1,955,958       $ 963,917   $ 4,048,745   2,919,876  
Exercise price                     $ 0.50   $ 0.49   $ 0.79
Exercise of warrants, shares | shares                     5,714,286        
Proceeds from exercise of warrants                     $ 2,857,143        
Issue of shares for cash from private placement, shares | shares               24,146,424 24,146,424            
Issue of shares for cash from private placement, share price                 $ 2.0707            
Proceeds from exercise of options               $ 62,745,000 $ 50,000,000         60,225,368  
Issue of shares on convertible debenture financing, shares | shares               869,271 869,271            
Issue of shares on convertible debenture financing               $ 2,258,820           2,258,820  
Establishment fee, percent               3.00% 3.00%            
Share issue related cos               $ 2,513,028           2,519,632  
Issue of shares for exploration and evaluation assets                           333,330  
Description of maximum term of options granted for share-based payment arrangement                       Pursuant to the Company's stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to 20% of the issued and outstanding common shares of the Company. The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company. Pursuant to the Company's stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to 20% of the issued and outstanding common shares of the Company. The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company.    
Percentage of issued and outstanding shares acquired                       20.00% 20.00%    
Options granted, maximum term                       10 years 10 years    
Share-based payments                       $ 13,736,299   9,183,667  
Included in exploration and evaluation assets [member]                              
Disclosure of classes of share capital [line items]                              
Share-based payments                       3,119,563   3,309,791  
Expensed to the statement of loss profit and comprehensive loss profit [member]                              
Disclosure of classes of share capital [line items]                              
Share-based payments                       13,736,299   9,183,667  
Dufferin Lake Property [member]                              
Disclosure of classes of share capital [line items]                              
Share issue related cos             $ 6,604                
Common shares issued | shares             111,110                
Issue of shares for exploration and evaluation assets             $ 333,330                
Percentage of remaining interest in exploration and evaluation of assets             40.00%                
Reserves [member]                              
Disclosure of classes of share capital [line items]                              
Exercise of options                       3,276,872   853,100  
Share-based payments                       $ 16,855,862   $ 12,493,458  
Options Exercised 1 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       250,000 250,000 199,446 199,446
Exercise price                       $ 0.30      
Exercise price                           $ 0.24  
Options Exercised 2 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       5,975,000 5,975,000 100,000 100,000
Exercise price                       $ 0.40      
Exercise price                           $ 0.40  
Options Exercised 3 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       1,100,000 1,100,000 50,000 50,000
Exercise price                       $ 0.46      
Exercise price                           $ 0.425  
Options Exercised 4 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       1,300,000 1,300,000 200,000 200,000
Exercise price                       $ 0.50      
Exercise price                           $ 0.46  
Options Exercised 5 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       500,000 500,000 300,000 300,000
Exercise price                       $ 0.62   $ 0.50  
Options Exercised 6 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       1,000,000 1,000,000 83,333 83,333
Exercise price                       $ 0.64   $ 0.62  
Options Exercised 7 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                       333,334 333,334 250,000 250,000
Exercise price                       $ 1.51   $ 0.64  
Options Exercised 8 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                           16,667 16,667
Exercise price                           $ 2.24  
Options Exercised 9 [member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                           58,333 58,333
Exercise price                           $ 2.65  
Options Exercised 10 [Member]                              
Disclosure of classes of share capital [line items]                              
Options exercised, shares | shares                           166,666 166,666
Exercise price                           $ 2.24