Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v2.4.1.9
Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]    
Notes payable, current, discount $ 829,019us-gaap_DebtInstrumentUnamortizedDiscount $ 743,062us-gaap_DebtInstrumentUnamortizedDiscount
Notes payable, discounts $ 1,530,804navb_LongTermNotesPayableUnamortizedDiscount $ 856,746navb_LongTermNotesPayableUnamortizedDiscount
Preferred stock, par value per share, in dollars per share $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value per share, in dollars per share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 150,200,259us-gaap_CommonStockSharesIssued 135,919,423us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 150,200,259us-gaap_CommonStockSharesOutstanding 135,919,423us-gaap_CommonStockSharesOutstanding
Series B Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Issued 4,519us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
7,565us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Preferred Stock, Shares Outstanding 4,519us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
7,565us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember