Quarterly report pursuant to Section 13 or 15(d)

Supplemental Disclosure for Statements of Cash Flows (Details)

v2.4.1.9
Supplemental Disclosure for Statements of Cash Flows (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Class of Stock [Line Items]      
Cash paid during the period for interest $ 701,000us-gaap_InterestPaid $ 907,000us-gaap_InterestPaid  
Issued stock to 401(k) plan, shares 68,157us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan    
Issued stock to 401(k) plan value 117,099us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan    
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  
Convertible Preferred Stock      
Class of Stock [Line Items]      
Deemed dividend on beneficial conversion feature of MT Preferred Stock     46,000navb_DividendPreferredStockDeemedDividendUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Macrophage Therapeutics | Convertible Preferred Stock      
Class of Stock [Line Items]      
Deemed dividend on beneficial conversion feature of MT Preferred Stock     $ 46,000navb_DividendPreferredStockDeemedDividendUponConversion
/ dei_LegalEntityAxis
= navb_MacrophageTherapeuticsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember