Annual report pursuant to Section 13 and 15(d)

Fair Value Hierarchy (Details)

v2.4.1.9
Fair Value Hierarchy (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Fair Value Measurements [Line Items]        
Change in fair value of financial instruments $ (1,342,389)navb_ChangeinFairValueofFinancialInstruments $ (112,073)navb_ChangeinFairValueofFinancialInstruments $ 32,110navb_ChangeinFairValueofFinancialInstruments  
Derivative liabilities 0us-gaap_DerivativeLiabilities 7,692,087us-gaap_DerivativeLiabilities    
Fair Value, Measurements, Recurring [Member]        
Fair Value Measurements [Line Items]        
Platinum notes payable 5,615,764us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
4,268,062us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
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]        
Fair Value Measurements [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
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurements [Line Items]        
Platinum notes payable 5,615,764us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
4,268,062us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
   
Platinum Montaur Life Sciences Llc Credit Facility [Member]        
Fair Value Measurements [Line Items]        
Change in fair value of financial instruments   106,000navb_ChangeinFairValueofFinancialInstruments
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
   
Platinum notes payable 5,600,000us-gaap_ConvertibleDebtFairValueDisclosures
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
     
Platinum Montaur Life Sciences Llc Credit Facility [Member] | Significant Unobservable Inputs (Level 3) [Member]        
Fair Value Measurements [Line Items]        
Change in fair value of financial instruments $ 1,348,000navb_ChangeinFairValueofFinancialInstruments
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member