General form of registration statement for all companies including face-amount certificate companies

Document And Entity Information

Document And Entity Information
12 Months Ended
Sep. 30, 2022
Document Information [Line Items]  
Entity Central Index Key 0001537561
Amendment Flag true
Document Type S-1/A
Amendment Description Amendment No. 1
Entity Registrant Name ARCH THERAPEUTICS, INC
Entity Incorporation, State or Country Code NV
Entity Tax Identification Number 46-0524102
Entity Address, Address Line One 235 Walnut St., Suite 6
Entity Address, City or Town Framingham
Entity Address, State or Province MA
Entity Address, Postal Zip Code 01702
City Area Code 617
Local Phone Number 431-2313
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false