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v3.21.2

Shareholders Equity and Capital Stock (Details) - Stock Option Activity [Member] | 6 Months Ended
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Jun. 30, 2021 $ / shares shares
Outstanding, Beginning Balance | shares | 11,910,424
Exercised, options | shares | (1,883,818)
Forfeited, Options | shares | (219,055)
Outstanding Ending Balance, Options | shares | 9,807,551
Outstanding, Beginning Balance, Weighted-average exercise price | $ / shares | $ 0.61
Exercised, Weighted-average exercise price | $ / shares | 0.63
Forfeited, Weighted-average exercise price | $ / shares | 0.56
Outstanding Ending Balance, Weighted-average exercise price | $ / shares | $ 0.62

X
- Definition Number of non-option equity instruments exercised by participants. + References No definition available. + Details
Name: | urg_ExercisedOptions
Namespace Prefix: | urg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References No definition available. + Details
Name: | urg_ForfeitedOptions
Namespace Prefix: | urg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | urg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberBeginning
Namespace Prefix: | urg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | urg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberEnding
Namespace Prefix: | urg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | urg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceBeginning
Namespace Prefix: | urg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | urg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceEnding
Namespace Prefix: | urg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=urg_StockOptionActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |