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Business Agreements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
item
Nov. 30, 2014
Mar. 31, 2014
Jan. 31, 2014
Sep. 30, 2013
Dec. 31, 2013
Oct. 31, 2014
Business Agreements                
Intangible asset $ 5,500us-gaap_IntangibleAssetsNetExcludingGoodwill           $ 2,437us-gaap_IntangibleAssetsNetExcludingGoodwill  
BOW015                
Business Agreements                
Upfront payment received 250eprs_CollaborativeArrangementsUpfrontPaymentReceived
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
             
Ranbaxy Laboratories Limited [Member]                
Business Agreements                
Damages payable to Ranbaxy on breach of license agreement 500eprs_DamagesOnBreachOfLicenseAgreement
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
             
Moksha8 Pharmaceuticals Inc                
Business Agreements                
Ownership percentage 17.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
             
Moksha8 Pharmaceuticals Inc | BOW015                
Business Agreements                
Payment to terminate payment obligations under agreement   1,500eprs_CollaborativeArrangementsPaymentToTerminateObligationsUnderAgreement
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
          1,400eprs_CollaborativeArrangementsPaymentToTerminateObligationsUnderAgreement
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
Number of payment installments to terminate obligations under agreement   2eprs_CollaborativeArrangementsNumberOfPaymentInstallmentsToTerminateObligationsUnderAgreement
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
           
Accrued royalty settlement   1,500eprs_AccruedRoyaltySettlement
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
           
Accrued royalty obligations               150eprs_AccruedRoyaltyObligations
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
Accrued liability               1,400eprs_AccruedLiability
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
Intangible asset   1,250us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
          1,250us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_CounterpartyNameAxis
= eprs_Moksha8PharmaceuticalsIncMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
Royalty Bearing And Non Transferable License Agreement [Member] | BOW015                
Business Agreements                
Number of units of accounting for recognition of revenue of deliverables 1eprs_RevenueRecognitionNumberOfUnitsOfAccountingForDeliverables
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
             
Royalty Bearing And Non Transferable License Agreement [Member] | Ranbaxy Laboratories Limited [Member] | BOW015                
Business Agreements                
Upfront payment received         500eprs_CollaborativeArrangementsUpfrontPaymentReceived
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
     
Maximum payments to be received for achievement of certain development and regulatory approval milestones         1,000eprs_CollaborativeArrangementsMaximumPaymentsToBeReceivedForAchievementOfCertainDevelopmentAndRegulatoryApprovalMilestones
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
     
Maximum payments to be received for achievement of certain sales milestones         10,000eprs_CollaborativeArrangementsMaximumPaymentsToBeReceivedForAchievementOfCertainSalesMilestones
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
     
Billings to Ranbaxy 1,250eprs_CollaborativeArrangementsBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
125eprs_CollaborativeArrangementsBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
250eprs_CollaborativeArrangementsBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
250eprs_CollaborativeArrangementsBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
125eprs_CollaborativeArrangementsBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
     
Deferred revenue over the remaining term of license agreement     500us-gaap_DeferredRevenue
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
         
Proceeds received from Ranbaxy 1,000eprs_CollaborativeArrangementsProceedsReceivedFromBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
             
Amount due from Ranbaxy 250eprs_CollaborativeArrangementsProceedsReceivableFromBillingsToCounterparty
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_RoyaltyBearingAndNonTransferableLicenseAgreementMember
             
Orygen Heads Of Agreement [Member] | Orygen Biotechnology [Member] | BOW015                
Business Agreements                
Upfront payment received           250eprs_CollaborativeArrangementsUpfrontPaymentReceived
/ us-gaap_CounterpartyNameAxis
= eprs_OrygenBiotechnologyMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_OrygenHeadsOfAgreementMember
   
Supply Agreement [Member] | Ranbaxy Laboratories Limited [Member] | BOW015                
Business Agreements                
Term of agreement   10 years            
Number of automatic renewals   5eprs_CollaborativeArrangementsNumberOfAutomaticRenewals
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_SupplyAgreementMember
           
Automatic renewal period   2 years            
Exclusive License And Collaboration Agreement [Member] | Ranbaxy Laboratories Limited [Member] | BOW015                
Business Agreements                
Maximum additional compounds subject to exclusive, royalty-bearing licenses 4eprs_CollaborativeArrangementsMaximumAdditionalCompoundsSubjectToExclusiveRoyaltyBearingLicenses
/ us-gaap_CounterpartyNameAxis
= eprs_RanbaxyLaboratoriesLimitedMember
/ us-gaap_ProductOrServiceAxis
= eprs_BOW015Member
/ us-gaap_TypeOfArrangementAxis
= eprs_ExclusiveLicenseAndCollaborationAgreementMember
             
Exclusive License And Collaboration Agreement [Member] | Livzon Mabpharm Inc                
Business Agreements                
Revenue recognized from licensing agreement 2,500us-gaap_LicenseAndServicesRevenue
/ us-gaap_CounterpartyNameAxis
= eprs_LivzonMabpharmIncMember
/ us-gaap_TypeOfArrangementAxis
= eprs_ExclusiveLicenseAndCollaborationAgreementMember
             
Term of agreement 20 years 20 years            
Payments to be received for achievement of specified regulatory milestones   $ 2,500eprs_CollaborativeArrangementsPaymentsToBeReceivedForAchievementOfSpecifiedRegulatoryMilestones
/ us-gaap_CounterpartyNameAxis
= eprs_LivzonMabpharmIncMember
/ us-gaap_TypeOfArrangementAxis
= eprs_ExclusiveLicenseAndCollaborationAgreementMember