Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Nov. 01, 2019
Document and Entity Information [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 Registrant Name AVENUE THERAPEUTICS, INC.  
Entity Central Index Key 0001644963  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Trading Symbol ATXI  
Entity Common Stock, Shares Outstanding   16,661,355
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Small Business true