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Condensed Consolidated Statements of Cash Flows and Supplemental Cash Flow Information (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities:    
Net loss $ (3,761)us-gaap_NetIncomeLoss $ (3,460)us-gaap_NetIncomeLoss
Reconciliation of net loss to cash used in operations:    
Accretion of asset retirement obligations 112us-gaap_AssetRetirementObligationAccretionExpense 79us-gaap_AssetRetirementObligationAccretionExpense
Amortization of debt discount 449us-gaap_AmortizationOfDebtDiscountPremium 243us-gaap_AmortizationOfDebtDiscountPremium
Amortization of convertible loan establishment fee 25us-gaap_AmortizationOfFinancingCostsAndDiscounts 25us-gaap_AmortizationOfFinancingCostsAndDiscounts
Change in fair value of derivative liability    (654)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Costs incurred for restoration and reclamation activities (48)us-gaap_EnvironmentalExpenseAndLiabilities   
Depreciation and amortization 85us-gaap_Depreciation 101us-gaap_Depreciation
Stock compensation expense 454us-gaap_ShareBasedCompensation 309us-gaap_ShareBasedCompensation
Gain on disposal of property, plant and equipment (18)us-gaap_GainLossOnDispositionOfAssets   
Effect of changes in operating working capital items:    
(Increase)/decrease in receivables 12us-gaap_IncreaseDecreaseInReceivables (245)us-gaap_IncreaseDecreaseInReceivables
Increase in prepaid and other current assets (184)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (207)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase in payables, accrued liabilities and deferred credits 175us-gaap_IncreaseDecreaseInOperatingLiabilities 59us-gaap_IncreaseDecreaseInOperatingLiabilities
Net Cash Used In Operating Activities (2,699)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (3,750)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows From Investing Activities:    
Proceeds from disposal of property, plant and equipment 18us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment   
Net Cash Provided By Investing Activities 18us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations   
Cash Flows From Financing Activities:    
Proceeds from convertible loan    2,000us-gaap_ProceedsFromConvertibleDebt
Payments on borrowings (4)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (4)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Issuance of common stock, net 5,619us-gaap_ProceedsFromIssuanceOfCommonStock 11,249us-gaap_ProceedsFromIssuanceOfCommonStock
Payment of minimum withholding taxes on net share settlements of equity awards (123)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation   
Net Cash Provided By Financing Activities 5,492us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 13,245us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 2,811us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 9,495us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 5,570us-gaap_CashAndCashEquivalentsAtCarryingValue 1,117us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, End of Period 8,381us-gaap_CashAndCashEquivalentsAtCarryingValue 10,612us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for:    
Interest    6us-gaap_InterestPaid
Supplemental Non-Cash Information With Respect to Investing and Financing Activities:    
Common stock issued for payment of convertible loan interest and fees $ 199URRE_StockIssuedDuringPeriodValueIssuedForPaymentOfLoanInterestAndFees $ 363URRE_StockIssuedDuringPeriodValueIssuedForPaymentOfLoanInterestAndFees