Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Shareholders' Equity and Capital Stock - o/s warrants (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 19, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Warrant or Right          
Exercise price $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.06us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Number of warrants 8,374,112us-gaap_ClassOfWarrantOrRightOutstanding 8,374,112us-gaap_ClassOfWarrantOrRightOutstanding   150,000us-gaap_ClassOfWarrantOrRightOutstanding 100,000us-gaap_ClassOfWarrantOrRightOutstanding
Remaining contractual life (years) 3 years        
Warrants Exercise Price Range One [Member]          
Class of Warrant or Right          
Exercise price $ 0.92us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeOneMember
       
Number of warrants 50,000us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeOneMember
       
Remaining contractual life (years) 8 months 12 days        
Expiry Sep. 04, 2015        
Warrants Exercise Price Range Two [Member]          
Class of Warrant or Right          
Exercise price $ 1.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeTwoMember
       
Number of warrants 100,000us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeTwoMember
       
Remaining contractual life (years) 9 months 18 days        
Expiry Nov. 01, 2015        
Warrants Exercise Price Range Three [Member]          
Class of Warrant or Right          
Exercise price $ 0.93us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeThreeMember
       
Number of warrants 25,000us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeThreeMember
       
Remaining contractual life (years) 1 year 2 months 12 days        
Expiry Mar. 05, 2016        
Warrants Exercise Price Range Four [Member]          
Class of Warrant or Right          
Exercise price $ 1.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFourMember
       
Number of warrants 2,354,545us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFourMember
       
Remaining contractual life (years) 2 years        
Expiry Dec. 19, 2016        
Warrants Exercise Price Range Five [Member]          
Class of Warrant or Right          
Exercise price $ 1.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFiveMember
       
Number of warrants 4,294,167us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFiveMember
       
Remaining contractual life (years) 3 years 6 months        
Expiry Jun. 24, 2018        
Warrants Exercise Price Range Six [Member]          
Class of Warrant or Right          
Exercise price $ 1.17us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeSixMember
       
Number of warrants 1,550,400us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeSixMember
       
Remaining contractual life (years) 3 years 7 months 6 days        
Expiry Aug. 27, 2018