Annual report pursuant to Section 13 and 15(d)

Equity (Details)

v2.4.1.9
Equity (Details) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2013
Apr. 30, 2013
Feb. 28, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Nov. 30, 2014
Sep. 24, 2016
Mar. 31, 2013
Mar. 31, 2014
Mar. 13, 2015
Class of Stock [Line Items]                        
Issued stock in connection with public offerings, net of costs, shares 10,563,381us-gaap_StockIssuedDuringPeriodSharesNewIssues 2,100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 1,542,389us-gaap_StockIssuedDuringPeriodSharesNewIssues                  
Shares issued price per share $ 2.84us-gaap_SharesIssuedPricePerShare $ 2.43us-gaap_SharesIssuedPricePerShare $ 3.10us-gaap_SharesIssuedPricePerShare                  
Proceeds from issuance of common stock net of issuance costs $ 28,800,000navb_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts $ 4,800,000navb_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts $ 4,500,000navb_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts                  
Proceeds from issuance of common stock 30,000,000us-gaap_ProceedsFromIssuanceOfCommonStock     87,984us-gaap_ProceedsFromIssuanceOfCommonStock 41,303,750us-gaap_ProceedsFromIssuanceOfCommonStock 2,724,189us-gaap_ProceedsFromIssuanceOfCommonStock            
Warrants, exercise price       $ 2.27us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1                
Placement agent fees 999,000navb_PlacementAgentFees                      
Placement agent fees as a percentage of gross proceeds 3.30%navb_Placementagentfeesasapercentageofgrossproceeds                      
Warrants outstanding       1,764,781us-gaap_ClassOfWarrantOrRightOutstanding                
Warrants, weighted average exercise price       $ 2.27navb_ClassOfWarrantOrRightWeightedAverageExercisePrice                
Repayments of notes payable       25,000,000us-gaap_RepaymentsOfNotesPayable 5,982,155us-gaap_RepaymentsOfNotesPayable 1,285,046us-gaap_RepaymentsOfNotesPayable            
Common stock reserved for future issuance       21,887,675us-gaap_CommonStockCapitalSharesReservedForFutureIssuance                
Series B Preferred Stock [Member]                        
Class of Stock [Line Items]                        
Conversion of Series B preferred stock to common stock, shares         2,364.9us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
  2,364.9us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
         
Common Stock [Member]                        
Class of Stock [Line Items]                        
Issued stock upon exercise of warrants, net, shares               3,843,223navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Number of common shares underlying Series B Preferred Stock       14,777,130navb_NumberofcommonsharesunderlyingSeriesBPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
               
Shares conversion, number of common stock equivalent to each preferred stock       3,270navb_SharesConversionNumberOfCommonStockEquivalentToEachPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
    3,270navb_SharesConversionNumberOfCommonStockEquivalentToEachPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
         
Minimum [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price       $ 1.918us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
               
Maximum [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price       $ 3.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
               
Platinum Montaur Life Sciences Llc Credit Facility [Member]                        
Class of Stock [Line Items]                        
Repayments of notes payable         4,800,000us-gaap_RepaymentsOfNotesPayable
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
  4,781,333us-gaap_RepaymentsOfNotesPayable
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
         
Subsequent Event [Member]                        
Class of Stock [Line Items]                        
Shares issued price per share                       $ 3.00us-gaap_SharesIssuedPricePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Warrants, expiration date                 Sep. 24, 2016      
Series JJ Warrants [Member]                        
Class of Stock [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
       
Series W Warrants [Member]                        
Class of Stock [Line Items]                        
Warrants exercised           6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesWWarrantsMember
           
Issued stock upon exercise of warrants, net, shares           6,000,000navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesWWarrantsMember
           
Proceeds from warrant exercises           1,920,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesWWarrantsMember
           
Series X Warrants [Member] | Platinum Montaur Life Sciences Llc Credit Facility [Member]                        
Class of Stock [Line Items]                        
Warrants exercised                   3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesXWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
   
Issued stock upon exercise of warrants, net, shares                   3,000,000navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesXWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
   
Proceeds from warrant exercises                   $ 1,380,000us-gaap_ProceedsFromWarrantExercises
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesXWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
   
Series X Warrants And Series AA Warrants [Member] | Platinum Montaur Life Sciences Llc Credit Facility [Member]                        
Class of Stock [Line Items]                        
Number of common shares underlying Series B Preferred Stock       7,733,223navb_NumberofcommonsharesunderlyingSeriesBPreferredStock
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesXWarrantsAndSeriesAaWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
    7,733,223navb_NumberofcommonsharesunderlyingSeriesBPreferredStock
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesXWarrantsAndSeriesAaWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
         
Series HH Warrants [Member]                        
Class of Stock [Line Items]                        
Warrants, number of securities called by warrants             301,205us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesHhWarrantsMember
         
Warrants, exercise price       $ 2.49us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesHhWarrantsMember
               
Warrants, expiration date       Jun. 25, 2023                
Warrants outstanding       301,205us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesHhWarrantsMember
               
Series HH Warrants [Member] | General Electric Capital Corporation [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price             2.49us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesHhWarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_GeneralElectricCapitalCorporationMember
         
Series II Warrants [Member]                        
Class of Stock [Line Items]                        
Warrants, number of securities called by warrants             275,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_FiveYearSeriesIiWarrantsMember
         
Warrants, exercise price       $ 3.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_FiveYearSeriesIiWarrantsMember
               
Warrants, expiration date       Jun. 25, 2018                
Warrants outstanding       275,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_FiveYearSeriesIiWarrantsMember
               
Class of warrant term             5 years          
Series II Warrants [Member] | Maximum [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price             3.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_FiveYearSeriesIiWarrantsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
         
Series KK Warrants [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price       $ 1.918us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesKKwarrantsMember
               
Warrants, expiration date       Mar. 04, 2021                
Warrants outstanding       391,032us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesKKwarrantsMember
               
Series KK Warrants [Member] | Oxford Finance, LLC [Member]                        
Class of Stock [Line Items]                        
Warrants, exercise price                     $ 1.918us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesKKwarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_OxfordFinanceLLCMember
 
Issued stock upon exercise of warrants, net, shares                     391,032navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_ClassOfWarrantOrRightAxis
= navb_SeriesKKwarrantsMember
/ us-gaap_DebtInstrumentAxis
= navb_OxfordFinanceLLCMember