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Exploration and Evaluation Assets - Summary of Capitalized Costs on Projects (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance $ 152,412,555  
Impairment   $ 87,749
Exploration and evaluation assets, ending balance 194,128,594 152,412,555
Acquisition Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 26,429,932 22,793,390
Additions 1,885,297 3,636,542
Exploration and evaluation assets, ending balance 28,315,229 26,429,932
Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 125,982,623 86,653,530
Expense arising from exploration for and evaluation of mineral resources 39,830,742 39,416,842
Impairment   (87,749)
Exploration and evaluation assets, ending balance 165,813,365 125,982,623
Rook I Property [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 113,173,036  
Exploration and evaluation assets, ending balance 148,894,002 113,173,036
Rook I Property [member] | Acquisition Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 235,077 230,807
Additions   4,270
Exploration and evaluation assets, ending balance 235,077 235,077
Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 112,937,959 77,007,303
Expense arising from exploration for and evaluation of mineral resources 35,720,966 35,930,656
Exploration and evaluation assets, ending balance 148,658,925 112,937,959
Other Athabasca Basin Properties [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 6,399,904  
Impairment   87,749
Exploration and evaluation assets, ending balance 7,988,140 6,399,904
Other Athabasca Basin Properties [member] | Acquisition Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 1,457,607 1,124,277
Additions   333,330
Exploration and evaluation assets, ending balance 1,457,607 1,457,607
Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 4,942,297 4,318,909
Expense arising from exploration for and evaluation of mineral resources 1,588,236 711,137
Impairment   (87,749)
Exploration and evaluation assets, ending balance 6,530,533 4,942,297
Drilling [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 17,865,105 21,764,192
Drilling [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 16,761,145 20,592,799
Drilling [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources   3,297
General Exploration [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 3,003,872 2,300,042
General Exploration [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 2,885,003 2,163,554
General Exploration [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources (23,200) 25,885
Geological and Geophysical [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 9,518,018 6,409,853
Geological and Geophysical [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 7,650,358 5,206,266
Geological and Geophysical [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 1,611,436 681,955
Labour and Wages [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 5,702,457 4,901,854
Labour and Wages [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 5,008,846 4,391,456
Share-based Payments [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 3,119,563 3,309,791
Share-based Payments [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 2,883,711 2,952,316
Travel [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 621,727 731,110
Travel [member] | Rook I Property [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 531,903 624,265
IsoEnergy Ltd. [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 32,839,615  
Exploration and evaluation assets, ending balance 37,246,452 32,839,615
IsoEnergy Ltd. [member] | Acquisition Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 24,737,248 21,438,306
Additions 1,885,297 3,298,942
Exploration and evaluation assets, ending balance 26,622,545 24,737,248
IsoEnergy Ltd. [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Exploration and evaluation assets, beginning balance 8,102,367 5,327,318
Expense arising from exploration for and evaluation of mineral resources 2,521,540 2,775,049
Exploration and evaluation assets, ending balance 10,623,907 8,102,367
IsoEnergy Ltd. [member] | Drilling [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 1,103,960 1,168,096
IsoEnergy Ltd. [member] | General Exploration [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 142,069 110,603
IsoEnergy Ltd. [member] | Geological and Geophysical [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 256,224 521,632
IsoEnergy Ltd. [member] | Labour and Wages [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 693,611 510,398
IsoEnergy Ltd. [member] | Share-based Payments [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources 235,852 357,475
IsoEnergy Ltd. [member] | Travel [member] | Deferred Exploration Costs [member]    
Disclosure of exploration and expenditure assets [line items]    
Expense arising from exploration for and evaluation of mineral resources $ 89,824 $ 106,845