Quarterly report pursuant to Section 13 or 15(d)

Investment in Macrophage Therapeutics, Inc. (Details)

v2.4.1.9
Investment in Macrophage Therapeutics, Inc. (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Class of Stock [Line Items]      
Derivative liabilities $ 63,000us-gaap_DerivativeLiabilities   $ 63,000us-gaap_DerivativeLiabilities
Deemed dividend on beneficial conversion feature of MT Preferred Stock (46,000)navb_DividendPreferredStockDeemedDividendUponConversion 0navb_DividendPreferredStockDeemedDividendUponConversion  
Minimum required proceeds from initial public offering 50,000,000navb_PreferredConvertibleStockRighttoExchangeforCommonSharesMinimumRequiredProceedsfromInitialPublicOffering    
Weighted average price per share 80.00%navb_WeightedAveragePriceCommonStockPercentage    
Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred stock authorized 50us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  50us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Purchase price per share (USD per share) $ 50,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  $ 50,000us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Percentage of preferred stock reserved 40.00%navb_ConvertiblePreferredStockPercentofSharesReserved
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  40.00%navb_ConvertiblePreferredStockPercentofSharesReserved
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Proceeds from issuance of convertible preferred stock and warrants 500,000us-gaap_ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
   
Deemed dividend on beneficial conversion feature of MT Preferred Stock     46,000navb_DividendPreferredStockDeemedDividendUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Value of warrants 2,000,000navb_IssuanceofStockandWarrantsforPurchaseAgreementRemainingAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
   
Put option fair value 113,000navb_DebtInstrumentFairValuePutOption
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
   
Common stock value 50,000navb_FutureCommonStockConversionDenominatorValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  50,000navb_FutureCommonStockConversionDenominatorValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Common Stock      
Class of Stock [Line Items]      
Price per share $ 3.00navb_FutureCommonStockConversionSharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
  $ 3.00navb_FutureCommonStockConversionSharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Macrophage Therapeutics | Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred stock authorized 50us-gaap_PreferredStockSharesAuthorized
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  50us-gaap_PreferredStockSharesAuthorized
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Preferred shares, per unit 1navb_ConvertiblePreferredStockSharesIssuedUponConversionPerUnit
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
   
Preferred stock issued 10us-gaap_PreferredStockSharesIssued
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  10us-gaap_PreferredStockSharesIssued
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Deemed dividend on beneficial conversion feature of MT Preferred Stock     $ 46,000navb_DividendPreferredStockDeemedDividendUponConversion
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Preferred stock value $ 58,320us-gaap_PreferredStockRedemptionPricePerShare
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
  $ 58,320us-gaap_PreferredStockRedemptionPricePerShare
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Macrophage Therapeutics | Common Stock      
Class of Stock [Line Items]      
Shares authorized upon exercise of warrants 1,500navb_CommonStockSharesAuthorizedUponExerciseofWarrants
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
  1,500navb_CommonStockSharesAuthorizedUponExerciseofWarrants
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Common stock warrants, per unit 30navb_CommonStockWarrantsIssuedUponConversionPerUnit
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Common stock as percentage of common equity 1.00%navb_CommonStockasPercentageofCommonEquity
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
  1.00%navb_CommonStockasPercentageofCommonEquity
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Number of shares underlying warrant issued 300us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
  300us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember