Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity and Capital Stock - o/s options (Details)

v2.4.1.9
Shareholders' Equity and Capital Stock - o/s options (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Outstanding Stock Options        
Exercise price $ 1.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 1.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 1.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 1.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Number of options, Outstanding 8,468,614us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 9,273,659us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 8,511,722us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 6,413,902us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted- average remaining contractual life (years), Outstanding 2 years 7 months 6 days      
Aggregate Intrinsic Value, Outstanding $ 443us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Number of options, Exercisable 7,023,022us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber      
Weighted- average remaining contractual life (years), Exercisable 2 years 2 months 12 days      
Aggregate Intrinsic Value, Exercisable 443us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1      
Stock Option Exercise Price Range One [Member]        
Outstanding Stock Options        
Exercise price $ 0.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeOneMember 		     
Number of options, Outstanding 455,595us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeOneMember 		     
Weighted- average remaining contractual life (years), Outstanding 2 months 12 days      
Aggregate Intrinsic Value, Outstanding 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeOneMember 		     
Number of options, Exercisable 455,595us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeOneMember 		     
Weighted- average remaining contractual life (years), Exercisable 2 months 12 days      
Aggregate Intrinsic Value, Exercisable 59us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeOneMember 		     
Expiry Mar. 05, 2015      
Stock Option Exercise Price Range Two [Member]        
Outstanding Stock Options        
Exercise price $ 2.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwoMember 		     
Number of options, Outstanding 1,227,034us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwoMember 		     
Weighted- average remaining contractual life (years), Outstanding 1 year 1 month 6 days      
Number of options, Exercisable 1,227,034us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwoMember 		     
Weighted- average remaining contractual life (years), Exercisable 1 year 1 month 6 days      
Expiry Jan. 28, 2016      
Stock Option Exercise Price Range Three [Member]        
Outstanding Stock Options        
Exercise price $ 1.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThreeMember 		     
Number of options, Outstanding 545,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThreeMember 		     
Weighted- average remaining contractual life (years), Outstanding 1 year 6 months      
Number of options, Exercisable 545,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThreeMember 		     
Weighted- average remaining contractual life (years), Exercisable 1 year 6 months      
Expiry Jul. 07, 2016      
Stock Option Exercise Price Range Four [Member]        
Outstanding Stock Options        
Exercise price $ 1.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourMember 		     
Number of options, Outstanding 657,782us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourMember 		     
Weighted- average remaining contractual life (years), Outstanding 1 year 8 months 12 days      
Number of options, Exercisable 657,782us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourMember 		     
Weighted- average remaining contractual life (years), Exercisable 1 year 8 months 12 days      
Expiry Sep. 09, 2016      
Stock Option Exercise Price Range Five [Member]        
Outstanding Stock Options        
Exercise price $ 1.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFiveMember 		     
Number of options, Outstanding 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFiveMember 		     
Weighted- average remaining contractual life (years), Outstanding 1 year 9 months 18 days      
Number of options, Exercisable 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFiveMember 		     
Weighted- average remaining contractual life (years), Exercisable 1 year 9 months 18 days      
Expiry Oct. 24, 2016      
Stock Option Exercise Price Range Six [Member]        
Outstanding Stock Options        
Exercise price $ 0.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSixMember 		     
Number of options, Outstanding 956,382us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSixMember 		     
Weighted- average remaining contractual life (years), Outstanding 2 years      
Aggregate Intrinsic Value, Outstanding 58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSixMember 		     
Number of options, Exercisable 956,382us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSixMember 		     
Weighted- average remaining contractual life (years), Exercisable 2 years      
Aggregate Intrinsic Value, Exercisable 58us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSixMember 		     
Expiry Jan. 12, 2017      
Stock Option Exercise Price Range Seven [Member]        
Outstanding Stock Options        
Exercise price $ 1.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSevenMember 		     
Number of options, Outstanding 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSevenMember 		     
Weighted- average remaining contractual life (years), Outstanding 2 years 1 month 6 days      
Number of options, Exercisable 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeSevenMember 		     
Weighted- average remaining contractual life (years), Exercisable 2 years 1 month 6 days      
Expiry Feb. 01, 2017      
Stock Option Exercise Price Range Eight [Member]        
Outstanding Stock Options        
Exercise price $ 1.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeEightMember 		     
Number of options, Outstanding 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeEightMember 		     
Weighted- average remaining contractual life (years), Outstanding 2 years 2 months 12 days      
Number of options, Exercisable 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeEightMember 		     
Weighted- average remaining contractual life (years), Exercisable 2 years 2 months 12 days      
Expiry Mar. 01, 2017      
Stock Option Exercise Price Range Nine [Member]        
Outstanding Stock Options        
Exercise price $ 0.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeNineMember 		     
Number of options, Outstanding 1,330,542us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeNineMember 		     
Weighted- average remaining contractual life (years), Outstanding 2 years 10 months 24 days      
Aggregate Intrinsic Value, Outstanding 229us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeNineMember 		     
Number of options, Exercisable 1,330,542us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeNineMember 		     
Weighted- average remaining contractual life (years), Exercisable 2 years 10 months 24 days      
Aggregate Intrinsic Value, Exercisable 229us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeNineMember 		     
Expiry Dec. 07, 2017      
Stock Option Exercise Price Range Ten [Member]        
Outstanding Stock Options        
Exercise price $ 0.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTenMember 		     
Number of options, Outstanding 594,152us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTenMember 		     
Weighted- average remaining contractual life (years), Outstanding 3 years 3 months 18 days      
Aggregate Intrinsic Value, Outstanding 97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTenMember 		     
Number of options, Exercisable 594,152us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTenMember 		     
Weighted- average remaining contractual life (years), Exercisable 3 years 3 months 18 days      
Aggregate Intrinsic Value, Exercisable $ 97us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTenMember 		     
Expiry Apr. 25, 2018      
Stock Option Exercise Price Range Eleven [Member]        
Outstanding Stock Options        
Exercise price $ 1.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeElevenMember 		     
Number of options, Outstanding 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeElevenMember 		     
Weighted- average remaining contractual life (years), Outstanding 3 years 7 months 6 days      
Number of options, Exercisable 76,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeElevenMember 		     
Weighted- average remaining contractual life (years), Exercisable 3 years 7 months 6 days      
Expiry Aug. 01, 2018      
Stock Option Exercise Price Range Twelve [Member]        
Outstanding Stock Options        
Exercise price $ 1.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwelveMember 		     
Number of options, Outstanding 965,351us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwelveMember 		     
Weighted- average remaining contractual life (years), Outstanding 4 years      
Number of options, Exercisable 522,857us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeTwelveMember 		     
Weighted- average remaining contractual life (years), Exercisable 4 years      
Expiry Dec. 27, 2018      
Stock Option Exercise Price Range Thirteen [Member]        
Outstanding Stock Options        
Exercise price $ 1.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThirteenMember 		     
Number of options, Outstanding 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThirteenMember 		     
Weighted- average remaining contractual life (years), Outstanding 4 years 2 months 12 days      
Number of options, Exercisable 54,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeThirteenMember 		     
Weighted- average remaining contractual life (years), Exercisable 4 years 2 months 12 days      
Expiry Mar. 31, 2019      
Stock Option Exercise Price Range Fourteen [Member]        
Outstanding Stock Options        
Exercise price $ 0.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourteenMemberMember 		     
Number of options, Outstanding 1,036,776us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourteenMemberMember 		     
Weighted- average remaining contractual life (years), Outstanding 4 years 10 months 24 days      
Number of options, Exercisable 103,678us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= urg_StockOptionExercisePriceRangeFourteenMemberMember 		     
Weighted- average remaining contractual life (years), Exercisable 4 years 10 months 24 days      
Expiry Dec. 12, 2019