Document And Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 08, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
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 16-1603202  
Entity Address, Address Line One 1895 Mount Hope Avenue  
Entity Address, City or Town Rochester  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 14620  
City Area Code 585  
Local Phone Number 271-2700  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $0.0001 par value  
Security Exchange Name NASDAQ  
Document Quarterly Report true  
Document Transition Report false  
Entity Incorporation, State or Country Code DE