Quarterly report pursuant to Section 13 or 15(d)

Other Liabilities (Details)

v2.4.1.9
Other Liabilities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Option Indexed to Issuers Equity [Line Items]      
Warrants Price Per Share On Nonhedging Derivative Financial Instrument $ 1.35urg_WarrantsPricePerShareOnNonhedgingDerivativeFinancialInstrument    
Warrants mark to market gain $ 77us-gaap_FairValueAdjustmentOfWarrants $ 263us-gaap_FairValueAdjustmentOfWarrants  
Capital Stock      
Option Indexed to Issuers Equity [Line Items]      
Number of securities called by each unit     1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Warrants      
Option Indexed to Issuers Equity [Line Items]      
Number of securities called by each unit     0.5us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember