Annual report pursuant to Section 13 and 15(d)

Segment Information (Details)

v2.4.1.9
Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Number of Reportable Segments 1us-gaap_NumberOfReportableSegments    
Restricted Cash $ 7,556us-gaap_RestrictedCashAndCashEquivalentsNoncurrent $ 5,055us-gaap_RestrictedCashAndCashEquivalentsNoncurrent  
Mineral properties 52,750us-gaap_MineralPropertiesNet 52,702us-gaap_MineralPropertiesNet 33,501us-gaap_MineralPropertiesNet
Capital assets 32,993us-gaap_PropertyPlantAndEquipmentNet 35,250us-gaap_PropertyPlantAndEquipmentNet  
Equity investment 1,090us-gaap_EquityMethodInvestments 1,085us-gaap_EquityMethodInvestments  
Non-current assets 94,389urg_AssetsNoncurrentExcludingDeferredFinancingCosts 94,092urg_AssetsNoncurrentExcludingDeferredFinancingCosts  
UNITED STATES      
Restricted Cash 7,556us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_US
5,055us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
/ us-gaap_StatementGeographicalAxis
= country_US
 
Mineral properties 52,750us-gaap_MineralPropertiesNet
/ us-gaap_StatementGeographicalAxis
= country_US
52,213us-gaap_MineralPropertiesNet
/ us-gaap_StatementGeographicalAxis
= country_US
 
Capital assets 32,993us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
35,250us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
 
Equity investment 1,090us-gaap_EquityMethodInvestments
/ us-gaap_StatementGeographicalAxis
= country_US
1,085us-gaap_EquityMethodInvestments
/ us-gaap_StatementGeographicalAxis
= country_US
 
Non-current assets 94,389urg_AssetsNoncurrentExcludingDeferredFinancingCosts
/ us-gaap_StatementGeographicalAxis
= country_US
93,603urg_AssetsNoncurrentExcludingDeferredFinancingCosts
/ us-gaap_StatementGeographicalAxis
= country_US
 
CANADA      
Mineral properties   489us-gaap_MineralPropertiesNet
/ us-gaap_StatementGeographicalAxis
= country_CA
 
Non-current assets   $ 489urg_AssetsNoncurrentExcludingDeferredFinancingCosts
/ us-gaap_StatementGeographicalAxis
= country_CA