Commitments - Off Take Sales Agreements (Details)	12 Months Ended
Dec. 31, 2016 lb
Commitments [Abstract]
2017 Commitment (in pounds)	600,000
2018 Commitment (in pounds)	500,000
2019 Commitment (in pounds)	600,000
2020 Commitment (in pounds)	450,000
2021 Commitment (in pounds)	250,000

The specified annual delivery commitment under the contract, in pounds of uranium, for the fifth specified production year.

No definition available.

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Namespace Prefix:	urg_
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The specified annual delivery commitment under the contract, in pounds of uranium, for the first specified production year.

No definition available.

Name:	urg_AnnualDeliveryCommitmentForFirstProductionYearInPounds
Namespace Prefix:	urg_
Data Type:	num:massItemType
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Period Type:	duration

The specified annual delivery commitment under the contract, in pounds of uranium, for the fourth specified production year.

No definition available.

Name:	urg_AnnualDeliveryCommitmentForFourthProductionYearInPounds
Namespace Prefix:	urg_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

The specified annual delivery commitment under the contract, in pounds of uranium, for the sixth specified production year.

No definition available.

Name:	urg_AnnualDeliveryCommitmentForSixthProductionYearInPounds
Namespace Prefix:	urg_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

The specified annual delivery commitment under the contract, in pounds of uranium, for the third specified production year.

No definition available.

Name:	urg_AnnualDeliveryCommitmentForThirdProductionYearInPounds
Namespace Prefix:	urg_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

No definition available.

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