Annual report pursuant to Section 13 and 15(d)

Derivative Instruments (Details)

v2.4.1.9
Derivative Instruments (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 30, 2014
Dec. 31, 2011
Sep. 30, 2013
Class of Warrant or Right [Line Items]            
Warrants, exercise price $ 2.27us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1          
Change in derivative liabilities $ (5,000)us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ 6,000us-gaap_GainLossOnDerivativeInstrumentsNetPretax $ (32,000)us-gaap_GainLossOnDerivativeInstrumentsNetPretax      
Derivative liabilities 0us-gaap_DerivativeLiabilities 7,692,087us-gaap_DerivativeLiabilities        
Common Stock [Member]            
Class of Warrant or Right [Line Items]            
Issued stock upon exercise of warrants, net, shares       3,843,223navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember 		   
Fair Value, Measurements, Recurring [Member]            
Class of Warrant or Right [Line Items]            
Derivative liabilities   7,692,087us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember 		       
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]            
Class of Warrant or Right [Line Items]            
Derivative liabilities   7,692,087us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember 		      7,700,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Series GG Warrants [Member]            
Class of Warrant or Right [Line Items]            
Warrants, number of securities called by warrants         333,333us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsFiveMember 		 
Warrants, exercise price         $ 2.10us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsFiveMember 		 
Warrants, expiration date         Dec. 29, 2016  
Provision effective period         365 days  
Estimated fair value of derivative liabilities         520,478us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsFiveMember 		 
Change in derivative liabilities     (38,000)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsFiveMember 		     
Reclassification to additional paid in capital     484,000navb_AdjustmentsToAdditionalPaidInCapitalWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsFiveMember 		     
Series V Warrants [Member]            
Class of Warrant or Right [Line Items]            
Reclassification to additional paid in capital     52,000navb_AdjustmentsToAdditionalPaidInCapitalWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsSixMember 		     
Warrants exercised     20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsSixMember 		     
Issued stock upon exercise of warrants, shares     20,000navb_StockIssuedDuringPeriodSharesStockOptionsAndWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsSixMember 		     
Issued stock upon exercise of warrants, gross proceeds     6,200navb_StockIssuedDuringPeriodValueStockOptionsAndWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesOfWarrantsSixMember 		     
Series JJ Warrants [Member]            
Class of Warrant or Right [Line Items]            
Warrants, number of securities called by warrants           3,169,015us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_ThreeYearSeriesJJWarrantsMember
Warrants, exercise price           $ 3.83us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_ThreeYearSeriesJJWarrantsMember
Reclassification to additional paid in capital       7,700,000navb_AdjustmentsToAdditionalPaidInCapitalWarrantExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_ThreeYearSeriesJJWarrantsMember