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Stock Based Compensation - Summary of Restricted Stock Awards (Details) (Restricted Stock Awards [Member], USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restricted Stock Awards [Member]
   
Number of restricted stock, Unvested Beginning of period 26,670us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
54,151us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Number of restricted stock, Granted      
Number of restricted stock, Forfeited    (1,851)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Number of restricted stock, Vested (2,778)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
(11,482)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Number of restricted stock, Unvested End of period 23,892us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
40,818us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Weighted Average Grant Date Fair Value, Unvested Beginning of period $ 5.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
$ 5.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Weighted Average Grant Date Fair Value, Granted      
Weighted Average Grant Date Fair Value, Forfeited    $ 2.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Weighted Average Grant Date Fair Value, Vested $ 2.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
$ 2.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
Weighted Average Grant Date Fair Value, Unvested End of period $ 5.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember
$ 6.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= URRE_RestrictedStockAwardsMember