Quarterly report pursuant to Section 13 or 15(d)

Financial instruments (Details)

v2.4.1.9
Financial instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
item
Cash, insured amount $ 0.6us-gaap_CashFDICInsuredAmount
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Basis Points 100urg_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesChangeInBasisPoints
Credit Concentration Risk [Member]  
Cash, Uninsured Amount 9.1us-gaap_CashUninsuredAmount
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
Credit Availability Concentration Risk [Member]  
Accounts Payable, Trade, Current $ 2.5us-gaap_AccountsPayableTradeCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditAvailabilityConcentrationRiskMember
Minimum [Member] | Credit Concentration Risk [Member]  
Investment Interest Rate 18.00%invest_InvestmentInterestRate
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Credit Availability Concentration Risk [Member]  
Debt Instrument, Term 0 years
Maximum [Member] | Credit Concentration Risk [Member]  
Investment Interest Rate 60.00%invest_InvestmentInterestRate
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Credit Availability Concentration Risk [Member]  
Debt Instrument, Term 6 years 6 months