Annual report pursuant to Section 13 and 15(d)

Commitments (Details)

v2.4.1.9
Commitments (Details)
 12 Months Ended
Dec. 31, 2014
lb
item
Off-Take Sales Agreements  
Number of off-take sales agreements 9urg_NumberOfAgreements
2015 Commitment (in pounds) 630,000urg_AnnualDeliveryCommitmentForFirstProductionYearInPounds
2016 Commitment (in pounds) 662,000urg_AnnualDeliveryCommitmentForSecondProductionYearInPounds
2017 Commitment (in pounds) 600,000urg_AnnualDeliveryCommitmentForThirdProductionYearInPounds
2018 Commitment (in pounds) 500,000urg_AnnualDeliveryCommitmentForFourthProductionYearInPounds
2019 Commitment (in pounds) 400,000urg_AnnualDeliveryCommitmentForFifthProductionYearInPounds
2020 Commitment (in pounds) 200,000urg_AnnualDeliveryCommitmentForSixthProductionYearInPounds
Off-Take Sales Agreement Entered February 2015 [Member]  
Off-Take Sales Agreements  
Annual delivery commitment (in pounds) 200,000urg_AnnualDeliveryCommitmentInPounds
/ us-gaap_SupplyCommitmentAxis
= urg_OffTakeSalesAgreementEnteredFebruary2015Member
Maximum | Off-Take Sales Agreement Entered March 2014 [Member]  
Off-Take Sales Agreements  
Annual delivery commitment (in pounds) 250,000urg_AnnualDeliveryCommitmentInPounds
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SupplyCommitmentAxis
= urg_OffTakeSalesAgreementEnteredMarch2014Member
Minimum | Off-Take Sales Agreement Entered March 2014 [Member]  
Off-Take Sales Agreements  
Annual delivery commitment (in pounds) 150,000urg_AnnualDeliveryCommitmentInPounds
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SupplyCommitmentAxis
= urg_OffTakeSalesAgreementEnteredMarch2014Member