Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Capital Stock - Outstanding RSUs (Details)

v2.4.1.9
Shareholders' Equity and Capital Stock - Outstanding RSUs (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Number of unvested units 651,639us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 379,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Remaining life (years) 1 year 7 months 6 days  
Aggregate value $ 619us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Awards Granted 2013 December 27 [Member]    
Number of unvested units 119,419us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2013December27Member
 
Remaining life (years) 8 months 27 days  
Aggregate value 113us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2013December27Member
 
Awards Granted 2014 December 12 [Member]    
Number of unvested units 257,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2014December12Member
 
Remaining life (years) 1 year 8 months 12 days  
Aggregate value 245us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2014December12Member
 
Awards Granted 2017 March 13 [Member]    
Number of unvested units 274,574us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2017March13Member
 
Remaining life (years) 1 year 11 months 12 days  
Aggregate value $ 261us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardDateAxis
= urg_AwardsGranted2017March13Member