v3.19.1
Document And Entity Information - shares
6 Months Ended
Mar. 31, 2019
May 13, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name Outlook Therapeutics, Inc.  
Entity Central Index Key 0001649989  
Trading Symbol ons  
Current Fiscal Year End Date --09-30  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   22,099,630
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true