v3.22.2.2
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Nov. 11, 2022
Cover [Abstract]    
Entity Registrant Name TRACON Pharmaceuticals, Inc.  
Entity Central Index Key 0001394319  
Document Type 10-Q  
Document Period End Date Sep. 30, 2022  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding   22,211,446
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Trading Symbol TCON  
Entity Shell Company false  
Entity File Number 001-36818  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 34-2037594  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Security Exchange Name NASDAQ  
Entity Address, Address Line One 4350 La Jolla Village Drive  
Entity Address, Address Line Two Suite 800  
Entity Address, City or Town San Diego  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92122  
City Area Code 858  
Local Phone Number 550-0780  
Document Quarterly Report true  
Document Transition Report false