| Document and Entity Information | Jun. 27, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001768446 |
| Document Type | 8-K |
| Document Period End Date | Jun. 27, 2024 |
| Entity Registrant Name | ELIEM THERAPEUTICS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40708 |
| Entity Tax Identification Number | 83-2273741 |
| Entity Address, Address Line One | 2801 Centerville Road 1st Floor |
| Entity Address, City or Town | Wilmington |
| Entity Address, State or Province | DE |
| Entity Address, Postal Zip Code | 19808-1609 |
| City Area Code | 1-877 |
| Local Phone Number | 354-3689 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | ELYM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
