| Document and Entity Information | Jun. 22, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001431959 |
| Document Type | 8-K |
| Document Period End Date | Jun. 22, 2022 |
| Entity Registrant Name | META MATERIALS INC. |
| Entity Incorporation State Country Code | NV |
| Entity File Number | 001-36247 |
| Entity Tax Identification Number | 74-3237581 |
| Entity Address, Address Line One | 1 Research Drive |
| Entity Address, City or Town | Darthmouth |
| Entity Address, State or Province | NS |
| Entity Address, Country | CA |
| Entity Address, Postal Zip Code | B2Y 4M9 |
| City Area Code | (902) |
| Local Phone Number | 482-5729 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.001 per share |
| Trading Symbol | MMAT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
