Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule of Credit Carryforward Amounts) (Details)

v2.4.1.9
Income Taxes (Schedule of Credit Carryforward Amounts) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]    
U.S. R&D credit carryforwards 8,394,408us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch $ 7,388,463us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
1998 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2018  
1999 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2019  
2000 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2020  
2001 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2021  
2002 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2022  
2003 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2023  
2004 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2024  
2005 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2025  
2006 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2026  
2007 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2027  
2008 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2028  
2009 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2029  
2010 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2030  
2011 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2031  
2012 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2032  
2013 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2033  
2014 [Member]    
Tax Credit Carryforward [Line Items]    
Expiration dates Dec. 31, 2034  
Domestic Tax Authority [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 153,105,438us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
118,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
U.S. R&D credit carryforwards 8,036,715us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
7,388,463us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Domestic Tax Authority [Member] | 1998 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 17,142,781us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_NineteenNinetyEightMember
 
U.S. R&D credit carryforwards 1,173,387us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_NineteenNinetyEightMember
 
Domestic Tax Authority [Member] | 1999 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_NineteenNinetyNineMember
 
U.S. R&D credit carryforwards 130,359us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_NineteenNinetyNineMember
 
Domestic Tax Authority [Member] | 2000 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandMember
 
U.S. R&D credit carryforwards 71,713us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandMember
 
Domestic Tax Authority [Member] | 2001 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandOneMember
 
U.S. R&D credit carryforwards 39,128us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandOneMember
 
Domestic Tax Authority [Member] | 2002 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 1,282,447us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandTwoMember
 
U.S. R&D credit carryforwards 5,350us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandTwoMember
 
Domestic Tax Authority [Member] | 2003 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 337,714us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandThreeMember
 
U.S. R&D credit carryforwards 2,905us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandThreeMember
 
Domestic Tax Authority [Member] | 2004 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 1,237,146us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandFourMember
 
U.S. R&D credit carryforwards 22,861us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandFourMember
 
Domestic Tax Authority [Member] | 2005 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 3,246,062us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandFiveMember
 
U.S. R&D credit carryforwards 218,332us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandFiveMember
 
Domestic Tax Authority [Member] | 2006 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 3,127,238us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandSixMember
 
U.S. R&D credit carryforwards 365,541us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandSixMember
 
Domestic Tax Authority [Member] | 2007 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 2,863,443us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandSevenMember
 
U.S. R&D credit carryforwards 342,898us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandSevenMember
 
Domestic Tax Authority [Member] | 2008 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 2,826,656us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandEightMember
 
U.S. R&D credit carryforwards 531,539us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandEightMember
 
Domestic Tax Authority [Member] | 2009 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 13,753,769us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandNineMember
 
U.S. R&D credit carryforwards 596,843us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwoThousandNineMember
 
Domestic Tax Authority [Member] | 2010 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 5,425,105us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyTenMember
 
U.S. R&D credit carryforwards 1,094,449us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyTenMember
 
Domestic Tax Authority [Member] | 2011 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 1,904,744us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyElevenMember
 
U.S. R&D credit carryforwards 1,950,744us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyElevenMember
 
Domestic Tax Authority [Member] | 2012 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 28,541,353us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyTwelveMember
 
U.S. R&D credit carryforwards 468,008us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyTwelveMember
 
Domestic Tax Authority [Member] | 2013 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 36,840,453us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyThirteenMember
 
U.S. R&D credit carryforwards 374,406us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyThirteenMember
 
Domestic Tax Authority [Member] | 2014 [Member]    
Tax Credit Carryforward [Line Items]    
U.S. Net Operating Loss Carryforwards 34,576,527us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyFourteenMember
 
U.S. R&D credit carryforwards 648,252us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_TaxCreditCarryforwardAxis
= navb_TwentyFourteenMember