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Shareholders' Equity and Capital Stock - Warrants expiry (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
|
3 Months Ended |
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Mar. 31, 2015
|
| Class of Warrant or Right [Line Items] |
|
| Exercise price |
$ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
|
| Number of warrants |
8,374,112us-gaap_ClassOfWarrantOrRightOutstanding
|
| Remaining contractual life (years) |
2 years 9 months 18 days
|
| Aggregate Intrinsic Value |
$ 13urg_Share-BasedCompensationArrangementByShare-BasedPaymentAwardWarrantsOptionsOutstandingIntrinsicValue
|
| Warrants Exercise Price Range One [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| 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) |
4 months 24 days
|
| Aggregate Intrinsic Value |
9urg_Share-BasedCompensationArrangementByShare-BasedPaymentAwardWarrantsOptionsOutstandingIntrinsicValue
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeOneMember
|
| Expiry |
Sep. 04, 2015
|
| Warrants Exercise Price Range Two [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| 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) |
7 months 6 days
|
| Expiry |
Nov. 01, 2015
|
| Warrants Exercise Price Range Three [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| 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) |
10 months 24 days
|
| Aggregate Intrinsic Value |
$ 4urg_Share-BasedCompensationArrangementByShare-BasedPaymentAwardWarrantsOptionsOutstandingIntrinsicValue
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeThreeMember
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| Expiry |
Mar. 05, 2016
|
| Warrants Exercise Price Range Four [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| 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) |
1 year 8 months 12 days
|
| Expiry |
Dec. 19, 2016
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| Warrants Exercise Price Range Five [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| Exercise price |
$ 1.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFiveMember
|
| Number of warrants |
4,294,167us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeFiveMember
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| Remaining contractual life (years) |
3 years 2 months 12 days
|
| Expiry |
Jun. 24, 2018
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| Warrants Exercise Price Range Six [Member] |
|
| Class of Warrant or Right [Line Items] |
|
| Exercise price |
$ 1.17us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeSixMember
|
| Number of warrants |
1,550,400us-gaap_ClassOfWarrantOrRightOutstanding
/ urg_WarrantsExercisePriceRangeAxis
= urg_WarrantsExercisePriceRangeSixMember
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| Remaining contractual life (years) |
3 years 4 months 24 days
|
| Expiry |
Aug. 27, 2018
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