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Concentration of Credit Risk (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Sales Revenue [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 30.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerMember
9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerMember
 
Sales Revenue [Member] | Customer B [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 28.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerBMember
25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerBMember
 
Sales Revenue [Member] | Customer C [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerCMember
0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerCMember
 
Sales Revenue [Member] | Customer D [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 3.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerDMember
54.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ neph_CustomerAxis
= neph_CustomerDMember
 
Accounts Receivable [Member] | Customer A [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerMember
  22.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerMember
Accounts Receivable [Member] | Customer B [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerBMember
  0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerBMember
Accounts Receivable [Member] | Customer C [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerCMember
  0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerCMember
Accounts Receivable [Member] | Customer D [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerDMember
  25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerDMember
Accounts Receivable [Member] | Customer E [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerEMember
  35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ neph_CustomerAxis
= neph_CustomerEMember