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Net Income (Loss) per Common Share (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Loss per share - Basic:    
Numerator for basic income (loss) per share $ 243,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (3,511,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for basic income (loss) per share 30,259,823us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,816,746us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic income (loss) per common share $ 0.01us-gaap_EarningsPerShareBasic $ (0.19)us-gaap_EarningsPerShareBasic
Loss per share - Diluted:    
Numerator for diluted income (loss) per share 243,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,511,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjust: Change in fair value of dilutive warrants outstanding (1,009,000)neph_AmountOfDilutiveSecuritiesEffectOnEarningsPerShareWarrants 2,751,000neph_AmountOfDilutiveSecuritiesEffectOnEarningsPerShareWarrants
Numerator for diluted income (loss) per share $ (766,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (760,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator for basic income (loss) per share 30,259,823us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,816,746us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus: Incremental shares underlying warrants outstanding 6,822,676us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for diluted income (loss) per share 37,082,499us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,816,746us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted income (loss) per common share $ (0.02)us-gaap_EarningsPerShareBasicAndDiluted $ (0.19)us-gaap_EarningsPerShareBasicAndDiluted