Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
 9 Months Ended
Jun. 30, 2021
Aug. 10, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --09-30  
Entity File Number 001-35570  
Entity Registrant Name SONNET BIOTHERAPEUTICS HOLDINGS, INC.  
Entity Central Index Key 0001106838  
Entity Tax Identification Number 20-2932652  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 100 Overlook Center  
Entity Address, Address Line Two Suite 102  
Entity Address, City or Town Princeton  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08540  
City Area Code (609)  
Local Phone Number 375-2227  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol SONN  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   24,956,887