Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Capital Stock (Details)

v2.4.1.9
Shareholders' Equity and Capital Stock (Details)
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2015
CAD
Dec. 31, 2014
Dec. 31, 2013
Capital Stock
Mar. 31, 2015
In Money Stock Option [Member]
USD ($)
Mar. 31, 2015
Restricted Stock Units (Rsus) [Member]
USD ($)
item
Mar. 31, 2014
Restricted Stock Units (Rsus) [Member]
Mar. 31, 2015
Restricted Stock Units (Rsus) [Member]
Capital Stock
Mar. 31, 2015
Employee Stock Option [Member]
Mar. 31, 2015
Grant Date [Member]
Employee Stock Option [Member]
Mar. 31, 2015
Four and One Half Months After Grant [Member]
Employee Stock Option [Member]
Mar. 31, 2015
Nine Months After Grant [Member]
Employee Stock Option [Member]
Mar. 31, 2015
Thirteen and One Half Months After Grant [Member]
Employee Stock Option [Member]
Mar. 31, 2015
Eighteen Months After Date Of Grant [Member]
Employee Stock Option [Member]
Mar. 31, 2015
First Anniversary [Member]
Restricted Stock Units (Rsus) [Member]
Mar. 31, 2015
Second Anniversary [Member]
Restricted Stock Units (Rsus) [Member]
Stockholder's Equity Note [Line Items]                                  
Vesting percentage                     10.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ urg_AwardVestingPeriodAxis
= urg_GrantDateMember
22.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ urg_AwardVestingPeriodAxis
= urg_FourAndOne-HalfMonthsAfterGrantMember
22.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ urg_AwardVestingPeriodAxis
= urg_NineMonthsAfterGrantMember
22.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ urg_AwardVestingPeriodAxis
= urg_ThirteenAndOne-HalfMonthsAfterGrantMember
24.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ urg_AwardVestingPeriodAxis
= urg_EighteenMonthsAfterTheDateOfGrantMember
50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ urg_AwardVestingPeriodAxis
= urg_FirstAnniversaryMember
50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ urg_AwardVestingPeriodAxis
= urg_SecondAnniversaryMember
Grant date intrinsic value $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue                                
Fair value of options vested in period $ 100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1                                
Share Price     1.20us-gaap_SharePrice                            
Number of options outstanding     7,971,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 8,468,614us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   4,843,195us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= urg_InTheMoneyStockOptionMember
                     
Number of options exercisable           3,915,659us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= urg_InTheMoneyStockOptionMember
                     
Retiree age for redemption threshold             65urg_Sharebasedcompensationarrangementbysharebasedpaymentawardretireeageforredemptionthreshold
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
                   
Years of service             5 years                    
Number of securities called by each unit         1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
               
Stock based compensation 188,000us-gaap_ShareBasedCompensation 293,000us-gaap_ShareBasedCompensation                              
Options, Unrecognized compensation           400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= urg_InTheMoneyStockOptionMember
                     
RSUs, Unrecognized compensation             600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
                   
Compensation recognition period (in years)           1 year 1 year 8 months 12 days                    
Proceeds from Stock Options Exercised $ 302,000us-gaap_ProceedsFromStockOptionsExercised $ 834,000us-gaap_ProceedsFromStockOptionsExercised                              
Granted, Options                   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Granted, RSU 274,574us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod             0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember