Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 18, 2022
Jun. 30, 2021
Document Information [Line Items]      
Entity Central Index Key 0000810509    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-35076    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 31-1080091    
Entity Address, Address Line One 4995 Bradenton Avenue, Suite 240    
Entity Address, City or Town Dublin    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 43017-3552    
City Area Code 614    
Local Phone Number 793-7500    
Title of 12(b) Security Common Stock, par value $.001 per share    
Trading Symbol NAVB    
Security Exchange Name NYSEAMER    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 35,956,327
Entity Common Stock, Shares Outstanding   30,299,054  
Auditor Name Marcum LLP    
Auditor Location Hartford, CT    
Auditor Firm ID 688