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Exploration and Evaluation Assets - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
ha
Claims
shares
Dec. 31, 2017
CAD ($)
shares
Jun. 12, 2017
shares
May 31, 2017
shares
Disclosure of exploration and expenditure assets [line items]        
Impairment of exploration and evaluation assets   $ 87,749    
Common share exchanged for acquired the claims | shares 10,458,334 1,424,445 327,863 5,714,286
Rook I Property [member]        
Disclosure of exploration and expenditure assets [line items]        
Number of mineral claims | Claims 32      
Size of mineral property | ha 35,065      
Ownership percentage of mineral property 100.00%      
Net smelter return royalty 2.00%      
Production carried interest 10.00%      
Description about net smelter return royalty The NSR may be reduced to 1% upon payment of $1 million.      
Percentage decrease in return royalty 1.00%      
Amount paid upon reduction of return royalty $ 1,000,000      
Other Athabasca Basin Properties [member]        
Disclosure of exploration and expenditure assets [line items]        
Impairment of exploration and evaluation assets   $ 87,749    
IsoEnergy Ltd. [member] | Radio Project [member]        
Disclosure of exploration and expenditure assets [line items]        
Ownership percentage of mineral property 100.00%      
Net smelter return royalty 2.00%      
Description about net smelter return royalty Subject to a 2% net smelter return royalty and 2% gross overriding royalty      
Gross overriding royalty 2.00%      
IsoEnergy Ltd. [member] | Thorburn Lake Project [member]        
Disclosure of exploration and expenditure assets [line items]        
Ownership percentage of mineral property 100.00%      
Net smelter return royalty 1.00%      
Production carried interest 10.00%      
Description about net smelter return royalty Subject to a 1% net smelter return royalty and a 10% carried interest which can be reduced to 1% at the holder's option upon completion of a bankable feasibility study      
Reduction percentage in holders option completion 1.00%      
IsoEnergy Ltd. [member] | Madison, 2Z, Carlson Creek and North Thorburn Properties [member]        
Disclosure of exploration and expenditure assets [line items]        
Ownership percentage of mineral property 100.00%      
IsoEnergy Ltd. [member] | Mountain Lake Property [member]        
Disclosure of exploration and expenditure assets [line items]        
Ownership percentage of mineral property 100.00%      
IsoEnergy Ltd. [member] | Geiger Property [member]        
Disclosure of exploration and expenditure assets [line items]        
Number of mineral claims | Claims 33      
Size of mineral property | ha 6,800      
Ownership percentage of mineral property 100.00%      
Common share exchanged for acquired the claims | shares 3,330,000      
Value of common share $ 1,282,050      
Cash payment for acquisition $ 200,000      
IsoEnergy Ltd. [member] | Larocque East Property [member]        
Disclosure of exploration and expenditure assets [line items]        
Number of mineral claims | Claims 6      
Size of mineral property | ha 3,200      
Ownership percentage of mineral property 100.00%      
Common share exchanged for acquired the claims | shares 1,000,000      
Value of common share $ 350,000      
Cash payment for acquisition $ 20,000      
IsoEnergy Ltd. [member] | Whitewater, Fox, East Rim, Full Moon [member]        
Disclosure of exploration and expenditure assets [line items]        
Ownership percentage of mineral property 100.00%