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Supplemental Disclosure with Respect to Cash Flows - Additional Information (Detail) - CAD ($)
 12 Months Ended
Dec. 11, 2018
Dec. 06, 2018
Jun. 12, 2018
Jun. 11, 2018
Dec. 12, 2017
Dec. 11, 2017
Jun. 12, 2017
Dec. 31, 2018
Dec. 31, 2017
Schedule of cash flow supplemental [line items]                  
Issue of shares on convertible debenture interest payment (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
Share-based payments               13,736,299 9,183,667
Exercise of options               (5,074,334) (1,128,032)
Issue of shares for exploration and evaluation assets                 $ 333,330
Dufferin Lake Property [member]                  
Schedule of cash flow supplemental [line items]                  
Issue of shares for exploration and evaluation assets (shares)                 111,110
Issue of shares for exploration and evaluation assets                 $ 333,330
Increase in ownership interest due to issuances of shares                 40.00%
Included in exploration and evaluation assets [member]                  
Schedule of cash flow supplemental [line items]                  
Share-based payments               $ 3,119,563 $ 3,309,791
IsoEnergy Ltd. [member]                  
Schedule of cash flow supplemental [line items]                  
Issue of shares for exploration and evaluation assets (shares)                 4,000,000
Issue of shares for exploration and evaluation assets                 $ 3,040,000
IsoEnergy Ltd. [member] | Geiger Property [member]                  
Schedule of cash flow supplemental [line items]                  
Issue of shares for exploration and evaluation assets (shares)               3,330,000 1,000,000
Issue of shares for exploration and evaluation assets               $ 1,282,050  
IsoEnergy Ltd. [member] | Laroque East uranium exploration property [member]                  
Schedule of cash flow supplemental [line items]                  
Issue of shares for exploration and evaluation assets (shares)               1,000,000  
Issue of shares for exploration and evaluation assets               $ 350,000  
Reserves [member]                  
Schedule of cash flow supplemental [line items]                  
Exercise of options               3,276,872 $ 853,100
Included in accounts payable and accrued liabilities [member]                  
Schedule of cash flow supplemental [line items]                  
Exploration and evaluation asset expenditures               2,763,713 612,900
Equipment expenditures               114,376 305,135
Interest expense related to convertible debentures               $ 708,960 $ 689,976