| Document And Entity Information | May 10, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 10, 2022 |
| Entity Registrant Name | AN2 Therapeutics, Inc. |
| Entity Central Index Key | 0001880438 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-41331 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 82-0606654 |
| Entity Address, Address Line One | 1800 El Camino Real, Suite D |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94027 |
| City Area Code | 650 |
| Local Phone Number | 331-9090 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | ANTX |
| Security Exchange Name | NASDAQ |
