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Convertible Loan, Related Party - Schedule of Issuance of Common Stock for Settlement of Interest Expense, Commitment Fees and Establishment Fee (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Shares of common stock issued, Amount | $ 1,038 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 3,600 us-gaap_StockIssuedDuringPeriodValueNewIssues
Shares of common stock issued, Shares | 428,765 us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Establishment Fee [Member] |  |
Shares of common stock issued, Amount | 300 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_EstablishmentFeeMember |
Shares of common stock issued, Shares | 117,188 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_EstablishmentFeeMember |
Volume Weighted Average Price | $ 2.5600 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_EstablishmentFeeMember |
Date of Issuance | Feb. 04, 2014 |
Interest Payment and Commitment Fee [Member] |  |
Shares of common stock issued, Amount | 63 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeMember |
Shares of common stock issued, Shares | 21,218 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeMember |
Volume Weighted Average Price | $ 2.9731 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeMember |
Date of Issuance | Feb. 04, 2014 |
Interest Payment and Commitment Fee One [Member] |  |
Shares of common stock issued, Amount | 138 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeOneMember |
Shares of common stock issued, Shares | 45,737 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeOneMember |
Volume Weighted Average Price | $ 3.0209 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeOneMember |
Date of Issuance | Apr. 10, 2014 |
Interest Payment and Commitment Fee Two [Member] |  |
Shares of common stock issued, Amount | 175 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeTwoMember |
Shares of common stock issued, Shares | 69,233 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeTwoMember |
Volume Weighted Average Price | $ 2.6561 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentAndCommitmentFeeTwoMember |
Date of Issuance | Jul. 25, 2014 |
Interest Payment [Member] |  |
Shares of common stock issued, Amount | 164 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentMember |
Shares of common stock issued, Shares | 72,477 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentMember |
Volume Weighted Average Price | $ 2.7595 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentMember |
Date of Issuance | Oct. 02, 2014 |
Interest Payment One [Member] |  |
Shares of common stock issued, Amount | $ 198 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentOneMember |
Shares of common stock issued, Shares | 102,912 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentOneMember |
Volume Weighted Average Price | $ 1.9434 URRE_VolumeWeightedAveragePrice / us-gaap_DebtInstrumentAxis = URRE_InterestPaymentOneMember |
Date of Issuance | Jan. 02, 2015 |

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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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