Quarterly report pursuant to Section 13 or 15(d)

Reduction in Force Rollforward (Details)

v2.4.1.9
Reduction in Force Rollforward (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Restructuring Reserve [Roll Forward]    
Accrued separation costs, beginning of period   $ 449,351us-gaap_RestructuringReserve
Accrued separation costs, end of period 1,055,132us-gaap_RestructuringReserve 449,351us-gaap_RestructuringReserve
Reduction in Force, May 2014    
Restructuring Reserve [Roll Forward]    
Payments related to reduction in force (405,187)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= navb_ReductioninForceMay2014Member
 
Reduction in Force, March 2015    
Restructuring Reserve [Roll Forward]    
Payments related to reduction in force (28,630)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= navb_ReductioninForceMarch2015Member
 
Charges incurred with reduction in force $ 1,039,598us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= navb_ReductioninForceMarch2015Member