Amortization of debt discount and establishment fee.

No definition available.

Name:	URRE_AmortizationOfDebtDiscountAndEstablishmentFee
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of common stock shares issued during period for settlement of debt.

+ References

No definition available.

+ Details

Name:	URRE_NumberOfCommonStockSharesIssuedDuringPeriodForSettlementOfDebt
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Issued During Period Shares Issued For Settlement Of Interest Expense.

+ References

No definition available.

+ Details

Name:	URRE_StockIssuedDuringPeriodSharesIssuedForSettlementOfInterestExpense
Namespace Prefix:	URRE_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Issued During Period Value Issued For Settlement Of Interest Expense.

+ References

No definition available.

+ Details

Name:	URRE_StockIssuedDuringPeriodValueIssuedForSettlementOfInterestExpense
Namespace Prefix:	URRE_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtConversionOriginalDebtAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

+ Details

Name:	us-gaap_InterestPaidNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=URRE_ResourceCapitalFundVLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=URRE_LoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=URRE_ResourceCapitalFundVLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreationDateAxis=URRE_NovemberTenTwoThousandAndSixteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=URRE_SecuredConvertibleLoanFacilityMember
Namespace Prefix:
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Convertible Loan, Related Party (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended		9 Months Ended
	Jul. 10, 2016	Jun. 10, 2016	Mar. 31, 2016	Jan. 04, 2016	Apr. 29, 2014	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2016	Mar. 07, 2016	Nov. 13, 2013
Line of Credit Facility [Line Items]
Number of common stock shares issued for settlement of interest expense				38,086
Number of common stock issued for settlement of interest expense							$ 200
Interest expense								$ 200
Amortization of debt discount and establishment fee						$ 500		$ 1,400
Common stock, shares outstanding						12,488,022	4,522,186	12,488,022
Resource Capital Fund V LP [Member]
Line of Credit Facility [Line Items]
Interest paid	$ 200	$ 300	$ 200					$ 100
Loan Agreement [Member] \| Resource Capital Fund V LP [Member]
Line of Credit Facility [Line Items]
Debt maturity date								Dec. 31, 2016
Debt interest rate						10.00%		10.00%
Debt conversation price per shares						$ 31.20		$ 31.20
Maximum [Member]
Line of Credit Facility [Line Items]
Common stock, shares outstanding									61,800,000
Minimum [Member]
Line of Credit Facility [Line Items]
Common stock, shares outstanding									5,200,000
Resource Capital Fund V LP [Member] \| November 10, 2016 [Member]
Line of Credit Facility [Line Items]
Common stock, shares outstanding						718,137		718,137
Percentage of outstanding stock						5.40%		5.40%
Debt conversation amount								$ 8,000
Issuance of common stock, shares								256,410
Resource Capital Fund V LP [Member] \| Maximum [Member] \| November 10, 2016 [Member]
Line of Credit Facility [Line Items]
Percentage of outstanding stock						7.14%		7.14%
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity										$ 15,000
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Maximum [Member] \| Loan Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit fee available					$ 15,000
Resource Capital Fund V LP [Member] \| Secured Convertible Loan Facility [Member] \| Minimum [Member] \| Loan Agreement [Member]
Line of Credit Facility [Line Items]
Line of credit fee available					$ 8,000