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Commitments and Contingencies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 31, 2015
EUR (€)
Mar. 31, 2015
Bellco [Member]
USD ($)
Mar. 31, 2015
Bellco [Member]
EUR (€)
Feb. 04, 2013
Medica Spa [Member]
USD ($)
Feb. 04, 2013
Medica Spa [Member]
EUR (€)
May 23, 2013
Medica Spa [Member]
USD ($)
May 23, 2013
Medica Spa [Member]
EUR (€)
Apr. 23, 2012
Medica Spa [Member]
USD ($)
Apr. 23, 2012
Medica Spa [Member]
EUR (€)
Mar. 31, 2015
Medica Spa [Member]
USD ($)
Mar. 31, 2015
Medica Spa [Member]
EUR (€)
Commitments And Contingencies [Line Items]                            
Number of units under first tier royalty receivable         125,000neph_NumberOfUnitsUnderFirstTierRoyaltyReceivable
/ dei_LegalEntityAxis
= neph_BellcoMember
125,000neph_NumberOfUnitsUnderFirstTierRoyaltyReceivable
/ dei_LegalEntityAxis
= neph_BellcoMember
               
First tier royalty per unit         1.90neph_FirstTierRoyaltyPerUnit
/ dei_LegalEntityAxis
= neph_BellcoMember
1.75neph_FirstTierRoyaltyPerUnit
/ dei_LegalEntityAxis
= neph_BellcoMember
               
Second tier royalty per unit         1.36neph_SecondTierRoyaltyPerUnit
/ dei_LegalEntityAxis
= neph_BellcoMember
1.25neph_SecondTierRoyaltyPerUnit
/ dei_LegalEntityAxis
= neph_BellcoMember
               
Upfront Fees And Connection Of First Amendment         $ 612,000neph_UpfrontFeesAndConnectionOfFirstAmendment
/ dei_LegalEntityAxis
= neph_BellcoMember
€ 450,000neph_UpfrontFeesAndConnectionOfFirstAmendment
/ dei_LegalEntityAxis
= neph_BellcoMember
               
License Agreement Payment                         2,000,000neph_LicenseAgreementPayment
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
1,500,000neph_LicenseAgreementPayment
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
Long-term Purchase Commitment, Amount                         265,000us-gaap_LongTermPurchaseCommitmentAmount
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
243,000us-gaap_LongTermPurchaseCommitmentAmount
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
Payments for Royalties             800,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
600,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
500,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
400,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
700,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
500,000us-gaap_PaymentsForRoyalties
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
   
Finite Lived Intangible Assets Amortization Expense Years Two And Three 210,000neph_FiniteLivedIntangibleAssetsAmortizationExpenseYearsTwoAndThree                          
Share Based Goods And Nonemployee Services Transaction Fair Market Value Of Options Granted                         273,000neph_ShareBasedGoodsAndNonemployeeServicesTransactionFairMarketValueOfOptionsGranted
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
 
Other Assets, Noncurrent 1,631,000us-gaap_OtherAssetsNoncurrent   1,684,000us-gaap_OtherAssetsNoncurrent                      
Accumulated Amortization of Other Deferred Costs 619,000us-gaap_AccumulatedAmortizationOfOtherDeferredCosts                          
Amortization of Other Deferred Charges 52,000us-gaap_OtherAmortizationOfDeferredCharges 158,000us-gaap_OtherAmortizationOfDeferredCharges 53,000us-gaap_OtherAmortizationOfDeferredCharges                      
Royalty rate 3.00%neph_RoyaltyRate                          
Debt Instrument, Interest Rate, Stated Percentage 12.00%us-gaap_DebtInstrumentInterestRateStatedPercentage                          
Purchase Obligation, Due in Next Twelve Months                     400,000us-gaap_PurchaseObligationDueInNextTwelveMonths
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
300,000us-gaap_PurchaseObligationDueInNextTwelveMonths
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
   
Purchase Obligation, Due in Second Year                     700,000us-gaap_PurchaseObligationDueInSecondYear
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
500,000us-gaap_PurchaseObligationDueInSecondYear
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
   
Purchase Obligation, Due in Third Year                     880,000us-gaap_PurchaseObligationDueInThirdYear
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
750,000us-gaap_PurchaseObligationDueInThirdYear
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                         300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= neph_MedicaSpaMember
Annual Minimum Amount $ 1,085,000neph_AnnualMinimumAmount     € 1,000,000neph_AnnualMinimumAmount