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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount    
Income tax benefit using U.S. federal statutory rate $ (14,241)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (7,076)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit (296)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (784)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other permanent differences 2,985eprs_EffectiveIncomeTaxRateReconciliationPermanentDifferencesAmount 1,581eprs_EffectiveIncomeTaxRateReconciliationPermanentDifferencesAmount
Foreign rate differential 3,836us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 574us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Tax credits (223)us-gaap_IncomeTaxReconciliationTaxCredits 143us-gaap_IncomeTaxReconciliationTaxCredits
Other items 503us-gaap_IncomeTaxReconciliationOtherAdjustments 21us-gaap_IncomeTaxReconciliationOtherAdjustments
Tax benefit related to the IPR&D transfer 185eprs_IncomeTaxReconciliationTaxBenefitRelatedToInProcessResearchAndDevelopmentTransfer  
Foreign withholding taxes 101eprs_IncomeTaxReconciliationForeignWithholdingTaxes  
Net change in valuation allowance 7,477us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,827us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Expense (Benefit), Total $ (43)us-gaap_IncomeTaxExpenseBenefit