Document And Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 14, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Current Reporting Status Yes  
Trading Symbol VCNX  
Entity Registrant Name Vaccinex, Inc.  
Entity Central Index Key 0001205922  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Ex Transition Period false  
Entity Common Stock, Shares Outstanding   14,862,536
Entity File Number 001-38624  
Entity Tax Identification Number 161603202  
Entity Address, Address Line One 1895 Mount Hope Avenue  
Entity Address, City or Town Rochester  
Entity Address, State or Province New York  
Entity Address, Postal Zip Code 14620  
City Area Code 585  
Local Phone Number 271-2700