Annual report pursuant to Section 13 and 15(d)

Supplemental Disclosure for Statements of Cash Flows (Details)

v2.4.1.9
Supplemental Disclosure for Statements of Cash Flows (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash paid during the period for interest $ 2,900,000us-gaap_InterestPaid $ 1,900,000us-gaap_InterestPaid $ 647,000us-gaap_InterestPaid
Issued stock for payment of milestone fee, shares   100,000navb_StockIssuedDuringPeriodSharesIssuedforMilestoneFee  
Issued stock to 401(k) plan, shares 36,455navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution 22,126navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution 17,390navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution
Issued stock for payment of sublicense fee, shares     300,000us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration
Portion of insurance premiums financed     267,000navb_PortionOfInsurancePremiumsFinanced
Interest rate stated percentage     2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
Equipment acquired under capital lease agreement     9,000us-gaap_CapitalLeasedAssetsGross
Repayments of notes payable 25,000,000us-gaap_RepaymentsOfNotesPayable 5,982,155us-gaap_RepaymentsOfNotesPayable 1,285,046us-gaap_RepaymentsOfNotesPayable
Platinum Montaur Life Sciences Llc Credit Facility [Member]      
Interest rate stated percentage 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember 		   
Repayments of notes payable   4,800,000us-gaap_RepaymentsOfNotesPayable
/ us-gaap_DebtInstrumentAxis
= navb_PlatinumMontaurLifeSciencesLlcCreditFacilityMember 		 
General Electric Capital Corporation [Member]      
Estimated fair value of warrants issued   631,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_DebtInstrumentAxis
= navb_GeneralElectricCapitalCorporationMember 		 
Deferred debt discount fees 3,000,000navb_DeferredDebtDiscountFees
/ us-gaap_DebtInstrumentAxis
= navb_GeneralElectricCapitalCorporationMember 		1,000,000navb_DeferredDebtDiscountFees
/ us-gaap_DebtInstrumentAxis
= navb_GeneralElectricCapitalCorporationMember 		 
Crede CG III, Ltd. [Member]      
Estimated fair value of warrants issued   7,700,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_DebtInstrumentAxis
= navb_CredeCGIIILtd.Member 		 
Oxford Finance, LLC [Member]      
Estimated fair value of warrants issued $ 465,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_DebtInstrumentAxis
= navb_OxfordFinanceLLCMember 		   
Series B Preferred Stock [Member]      
Conversion of Series B preferred stock to common stock, shares   2,364.9us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember