Cover
Cover - USD ($) | 9 Months Ended | ||
Sep. 30, 2021 | Dec. 16, 2021 | Mar. 31, 2021 | |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Amendment Flag | false | ||
Document Annual Report | true | ||
Document Transition Report | false | ||
Document Period End Date | Sep. 30, 2021 | ||
Document Fiscal Period Focus | FY | ||
Document Fiscal Year Focus | 2021 | ||
Current Fiscal Year End Date | --09-30 | ||
Entity File Number | 000-54986 | ||
Entity Registrant Name | ARCH THERAPEUTICS, INC. | ||
Entity Central Index Key | 0001537561 | ||
Entity Tax Identification Number | 46-0524102 | ||
Entity Incorporation, State or Country Code | NV | ||
Entity Address, Address Line One | 235 Walnut Street | ||
Entity Address, Address Line Two | 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 | ||
Title of 12(g) Security | Common Stock, par value $0.001 per share | ||
Entity Well-known Seasoned Issuer | No | ||
Entity Voluntary Filers | No | ||
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 Public Float | $ 32,000,000 | ||
Entity Common Stock, Shares Outstanding | 237,169,770 |