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Commitments and Contingencies (Details) (USD $)
Dec. 31, 2014
Commitments And Contingencies [Line Items]  
Payments Due, Total $ 281,000us-gaap_ContractualObligation
Payments Due Within 1 Year 279,000us-gaap_ContractualObligationDueInNextTwelveMonths
Payments Due Within 1 - 3 Years 2,000us-gaap_ContractualObligationDueInSecondAndThirdYear
Payments Due Within 4 - 5 Years 0us-gaap_ContractualObligationDueInFourthAndFifthYear
Payments Due More Than 5 Years 0us-gaap_ContractualObligationDueAfterFifthYear
Leases [Member]  
Commitments And Contingencies [Line Items]  
Payments Due, Total 106,000us-gaap_ContractualObligation
/ neph_CommitmentsAndObligationsAxis
= neph_LeasesMember
Payments Due Within 1 Year 104,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ neph_CommitmentsAndObligationsAxis
= neph_LeasesMember
Payments Due Within 1 - 3 Years 2,000us-gaap_ContractualObligationDueInSecondAndThirdYear
/ neph_CommitmentsAndObligationsAxis
= neph_LeasesMember
Payments Due Within 4 - 5 Years 0us-gaap_ContractualObligationDueInFourthAndFifthYear
/ neph_CommitmentsAndObligationsAxis
= neph_LeasesMember
Payments Due More Than 5 Years 0us-gaap_ContractualObligationDueAfterFifthYear
/ neph_CommitmentsAndObligationsAxis
= neph_LeasesMember
Employment Contracts [Member]  
Commitments And Contingencies [Line Items]  
Payments Due, Total 175,000us-gaap_ContractualObligation
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_EmploymentContractsMember		 [1]
Payments Due Within 1 Year 175,000us-gaap_ContractualObligationDueInNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_EmploymentContractsMember		 [1]
Payments Due Within 1 - 3 Years 0us-gaap_ContractualObligationDueInSecondAndThirdYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_EmploymentContractsMember		 [1]
Payments Due Within 4 - 5 Years 0us-gaap_ContractualObligationDueInFourthAndFifthYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_EmploymentContractsMember		 [1]
Payments Due More Than 5 Years $ 0us-gaap_ContractualObligationDueAfterFifthYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_EmploymentContractsMember		 [1]
[1] Represents amount payable under severance agreement for John C. Houghton, effective January 4, 2015. See Note 15, Subsequent Events, for further discussion.