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Derivative Liability - Schedule of Changes in Derivative Liability Related to Conversion Feature (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair value of derivative liability beginning balance | $ 2,169 us-gaap_DerivativeLiabilitiesNoncurrent |
Change in fair value of derivative liability | (2,919)us-gaap_IncreaseDecreaseInDerivativeLiabilities | 108 us-gaap_IncreaseDecreaseInDerivativeLiabilities
Reclassification to equity | (2,497)us-gaap_ReclassificationsOfTemporaryToPermanentEquity |
Fair value of derivative liability end balance |  | 2,169 us-gaap_DerivativeLiabilitiesNoncurrent
Fair Value Of Derivative Liability One [Member] |  |
Fair value of derivative liability drawdown | 1,556 URRE_FairValueOfDerivativeLiabilityDrawdown / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityOneMember |
Fair Value Of Derivative Liability Two [Member] |  |
Fair value of derivative liability drawdown | $ 1,691 URRE_FairValueOfDerivativeLiabilityDrawdown / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityTwoMember | $ 2,061 URRE_FairValueOfDerivativeLiabilityDrawdown / us-gaap_DebtInstrumentAxis = URRE_FairValueOfDerivativeLiabilityTwoMember

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- Definition Fair value of derivative liability drawdown. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition The increase (decrease) during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer). + References No definition available. + Details
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- Definition The difference between the carrying amount of a financial instrument subject to a registration payment arrangement recorded as temporary equity prior to adoption of FSP EITF 00-19-2 and the carrying amount reclassified to permanent equity upon the adoption of FSP EITF 00-19-2. Recorded as a cumulative effect adjustment to the beginning balance of retained earnings. Does not apply to registration payment arrangements that are no longer outstanding upon adoption of FSP EITF 00-19-2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90193-114008 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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