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Notes Payable (Narrative) (Details) (USD $)
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3 Months Ended | 1 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2014
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Dec. 31, 2014
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| Debt Instrument [Line Items] | ||||
| Unamortized debt discount | $ 816,539us-gaap_DebtInstrumentUnamortizedDiscount | $ 829,019us-gaap_DebtInstrumentUnamortizedDiscount | ||
| Proceeds from notes payable | 3,000,000us-gaap_ProceedsFromNotesPayable | 30,000,000us-gaap_ProceedsFromNotesPayable | ||
| Non-cash change in fair value | (1,000)us-gaap_DerivativeGainLossOnDerivativeNet | |||
| Interest expense | 967,000us-gaap_InterestExpenseDebt | 944,000us-gaap_InterestExpenseDebt | ||
| Interest expense recorded related to amortization | 213,000navb_InterestExpenseRecordedRelatedToAmortizationOfDebtDiscountsAndDeferredFinancingCosts | 242,000navb_InterestExpenseRecordedRelatedToAmortizationOfDebtDiscountsAndDeferredFinancingCosts | ||
| Oxford Finance, LLC | ||||
| Debt Instrument [Line Items] | ||||
| Debt face amount |
30,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
30,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Debt instrument, interest rate |
8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Notes payable |
30,000,000us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Debt issuance cost |
120,000us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Unamortized debt discount |
2,200,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Balance of debt issuance cost |
81,000us-gaap_DeferredFinanceCostsNet / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Oxford Finance, LLC | Series KK Warrants and other fees to lenders | ||||
| Debt Instrument [Line Items] | ||||
| Debt unamortized discount, Net |
3,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKWarrantsandotherfeestolendersMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
3,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKWarrantsandotherfeestolendersMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Oxford Finance, LLC | Series KK warrants | ||||
| Debt Instrument [Line Items] | ||||
| Number of shares underlying warrant issued |
391,032us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKwarrantsMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
391,032us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKwarrantsMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Exercise price of warrant issued, dollars per share |
$ 1.918us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKwarrantsMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
$ 1.918us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = navb_SeriesKKwarrantsMember / us-gaap_DebtInstrumentAxis = navb_OxfordFinanceLLCMember |
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| Second Amended Platinum Note | ||||
| Debt Instrument [Line Items] | ||||
| Notes payable |
6,200,000us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| Maximum borrowing capacity, amount |
50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| Proceeds from notes payable |
3,000,000us-gaap_ProceedsFromNotesPayable / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| Non-cash change in fair value |
1,727,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| Estimated fair value |
6,900,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| Unused borrowing capacity, Amount |
28,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = navb_SecondAmendedPlatinumNoteMember |
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| R-NAV | ||||
| Debt Instrument [Line Items] | ||||
| Notes payable |
$ 666,666us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = navb_RNAVMember |
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| X | ||||||||||
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- Definition
mount of non-cash interest expense related to amortization of debt discounts and deferred financing costs. No definition available.
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| X | ||||||||||
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- Definition
Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). No definition available.
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| X | ||||||||||
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- Definition
For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. No definition available.
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| X | ||||||||||
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- Definition
Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow from a borrowing supported by a written promise to pay an obligation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Details
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