Annual report pursuant to Section 13 and 15(d)

Equity Investment (Details)

v2.4.1.9
Equity Investment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2012
Equity Investment      
Asset Impairment Charges $ 483us-gaap_AssetImpairmentCharges $ 1,430us-gaap_AssetImpairmentCharges  
Bootheel Project Llc [Member]      
Equity Investment      
Project Expenditure Percentage 25.00%urg_ProjectExpenditurePercentage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= urg_BootheelProjectLlcMember
   
Equity Method Investment, Ownership Percentage     19.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= urg_BootheelProjectLlcMember
Asset Impairment Charges $ 0us-gaap_AssetImpairmentCharges
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= urg_BootheelProjectLlcMember
   
Jet Metals | Bootheel Project Llc [Member]      
Equity Investment      
Project Expenditure Percentage 75.00%urg_ProjectExpenditurePercentage
/ dei_LegalEntityAxis
= urg_CrosshairEnergyCorporationMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= urg_BootheelProjectLlcMember