Annual report pursuant to Section 13 and 15(d)

Investment in R-NAV (Details)

v2.4.1.9
Investment in R-NAV (Details) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 15, 2014
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]          
Loss from equity method investment $ 523,809us-gaap_IncomeLossFromEquityMethodInvestments $ 0us-gaap_IncomeLossFromEquityMethodInvestments $ 0us-gaap_IncomeLossFromEquityMethodInvestments    
R-NAV [Member]          
Schedule of Equity Method Investments [Line Items]          
Initial capitalization of investment       4,000,000navb_EquityMethodInvestmentInitialCapitalization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Payments to acquire equity method investment       333,334us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Promissory note payable       666,666navb_EquityMethodInvestmentPromissoryNotePayable
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Conversion price       $ 1us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Ownership percentage 32.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
    33.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
32.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
Additional capitalization 570,000navb_EquityMethodInvestmentAdditionalCapitalization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
      570,000navb_EquityMethodInvestmentAdditionalCapitalization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
Aggregate cost       1,000,000us-gaap_EquityMethodInvestmentAggregateCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Equity investment       727,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Deferred equity investment       500,000navb_DeferredEquityInvestment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
Loss from equity method investment 523,809us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
       
R-NAV [Member] | Series A Preferred Stock [Member]          
Schedule of Equity Method Investments [Line Items]          
Ownership shares received       1,000,000navb_EquityMethodInvestmentOwnershipSharesReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
570,000navb_EquityMethodInvestmentOwnershipSharesReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Ownership shares contingently receivable       500,000navb_EquityMethodInvestmentOwnershipSharesContingentlyReceivable
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
R-NAV [Member] | Federal Funds Rate [Member]          
Schedule of Equity Method Investments [Line Items]          
Debt instrument, spread on variable rate       0.31%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
/ us-gaap_VariableRateAxis
= navb_FederalFundsRateMember
 
R-NAV [Member] | Commitment to Invest [Member]          
Schedule of Equity Method Investments [Line Items]          
Other commitment       1,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= navb_CommitmenttoInvestMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVMember
 
R-NAV Subsidiary 1A [Member] | Call Option [Member]          
Schedule of Equity Method Investments [Line Items]          
Warrants and rights outstanding       10,500,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_CallOptionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVSubsidiary1AMember
 
Equity investment       $ 273,000us-gaap_EquityMethodInvestments
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_CallOptionMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= navb_RNAVSubsidiary1AMember