Annual report pursuant to Section 13 and 15(d)

Other Liabilities (Details)

v2.4.1.9
Other Liabilities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 19, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Liabilities          
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.35us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.06us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrants Price Per Share On Nonhedging Derivative Financial Instrument $ 1.35urg_WarrantsPricePerShareOnNonhedgingDerivativeFinancialInstrument        
Warrants mark to market adjustment (note 16) $ 946us-gaap_FairValueAdjustmentOfWarrants        
Capital Stock          
Other Liabilities          
Number of securities called by each unit 1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		       
Warrants          
Other Liabilities          
Number of securities called by each unit 0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember 		       
Warrants mark to market adjustment (note 16) $ 946us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember