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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

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