| Cover - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2022 | Mar. 08, 2023 | Feb. 06, 2023 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Dec. 31, 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2022 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity File Number | 001-41429 | ||
| Entity Registrant Name | PROMIS NEUROSCIENCES INC. | ||
| Entity Central Index Key | 0001374339 | ||
| Entity Tax Identification Number | 98-0647155 | ||
| Entity Incorporation, State or Country Code | Z4 | ||
| Entity Address, Address Line One | Suite 200, 1920 Yonge Street | ||
| Entity Address, City or Town | Toronto | ||
| Entity Address, State or Province | ON | ||
| Entity Address, Postal Zip Code | M4S 3E2 | ||
| City Area Code | 416 | ||
| Local Phone Number | 847-6898 | ||
| Title of 12(b) Security | Common Shares, No Par Value per Share | ||
| Trading Symbol | PMN | ||
| Security Exchange Name | NASDAQ | ||
| 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 | true | ||
| Elected Not To Use the Extended Transition Period | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 36.1 | ||
| Entity Common Stock, Shares Outstanding | 8,579,284 | ||
| ICFR Auditor Attestation Flag | false | ||
| Auditor Name | Baker Tilly US, LLP | ||
| Auditor Location | Tewksbury, Massachusetts | ||
| Auditor Firm ID | 23 |
