Annual report pursuant to Section 13 and 15(d)

Reduction in Force (Details)

v2.4.1.9
Reduction in Force (Details) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended
May 30, 2014
Jun. 30, 2014
May 31, 2014
employee
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]        
Number of employees terminated     11navb_NumberofEmployeesTerminated  
Professional fees $ 15,000us-gaap_ProfessionalFees $ 27,500us-gaap_ProfessionalFees    
Issued restricted stock, shares   40,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross    
Remaining accrued costs       449,351us-gaap_RestructuringReserveCurrent
Restructuring costs       557,000us-gaap_RestructuringCosts
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Remaining accrued costs       388,469us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Healthcare Coverage [Member]        
Restructuring Cost and Reserve [Line Items]        
Remaining accrued costs       60,882us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= navb_HealthcareCoverageMember
Chief Executive Officer [Member]        
Restructuring Cost and Reserve [Line Items]        
Severance costs 750,000us-gaap_SeveranceCosts1
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
     
Pykett Consulting Agreement [Domain]        
Restructuring Cost and Reserve [Line Items]        
Professional fees       94,000us-gaap_ProfessionalFees
/ navb_AgreementsByTypeAxis
= navb_PykettConsultingAgreementDomain
Pykett Consulting Agreement [Domain]        
Restructuring Cost and Reserve [Line Items]        
Professional fees       $ 53,000us-gaap_ProfessionalFees
/ navb_AgreementsByTypeAxis
= navb_MontaurServicesAgreementDomain