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Derivative Liability - Schedule of Changes in Derivative Liability Related to Conversion Feature (Details) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Of Derivative Liability One [Member] |  |
Proceeds from issuance of debt | $ 2,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityOneMember |
Fair Value Of Derivative Liability Two [Member] |  |
Proceeds from issuance of debt | $ 3,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityTwoMember | $ 3,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityTwoMember

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=URRE_FairValueOfDerivativeLiabilityOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=URRE_FairValueOfDerivativeLiabilityTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |