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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% |  |  |

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