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Summary of Significant Accounting Policies - Schedule of Financial Instruments Recognized at Fair Value on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Restricted cash | $ 3,941 us-gaap_RestrictedCashAndCashEquivalents | $ 4,011 us-gaap_RestrictedCashAndCashEquivalents
Total financial assets | 3,941 us-gaap_AssetsFairValueDisclosure | 4,011 us-gaap_AssetsFairValueDisclosure
Derivative liabilities |  | 2,169 us-gaap_DerivativeLiabilitiesCurrent
Total financial liabilities |  | 2,169 us-gaap_LiabilitiesFairValueDisclosure
Fair Value, Inputs, Level 1 [Member] |  |
Restricted cash | 3,941 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelOneMember | 4,011 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelOneMember
Total financial assets | 3,941 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelOneMember | 4,011 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelOneMember
Derivative liabilities |  |
Total financial liabilities |  |
Fair Value, Inputs, Level 2 [Member] |  |
Restricted cash |  |
Total financial assets |  |
Derivative liabilities |  |
Total financial liabilities |  |
Fair Value, Inputs, Level 3 [Member] |  |
Restricted cash |  |
Total financial assets |  |
Derivative liabilities |  | 2,169 us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelThreeMember
Total financial liabilities |  | $ 2,169 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = URRE_FairValueInputsLevelThreeMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + 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 within one year or 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 -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: 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 3: 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 4: 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 5: 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 6: 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 Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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