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Warrants (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Warrants [Line Items]    
Proceeds from issuance of common stock $ 1,000us-gaap_ProceedsFromWarrantExercises $ 1,000us-gaap_ProceedsFromWarrantExercises
Warrant [Member]    
Warrants [Line Items]    
Warrants exercised 20,927neph_WarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember		  
Common Stock [Member]    
Warrants [Line Items]    
Proceeds from issuance of common stock $ 1,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		  
Stock issued during period, shares, new issues 967us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember