| Document and Entity Information | Oct. 19, 2023 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 19, 2023 |
| Entity Registrant Name | TOURMALINE BIO, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 007-40384 |
| Entity Tax Identification Number | 83-2377352 |
| Entity Address Address Line 1 | 27 West 24th Street |
| Entity Address Address Line 2 | Suite 702 |
| Entity Address City Or Town | New York |
| Entity Address State Or Province | NY |
| Entity Address Postal Zip Code | 10010 |
| City Area Code | 646 |
| Local Phone Number | 481-9832 |
| Entity Information Former Legal Or Registered Name | Talaris Therapeutics, Inc. |
| Soliciting Material | false |
| Written Communications | 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 | TRML |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Current Fiscal Year End Date | --12-31 |
| Entity Central Index Key | 0001827506 |
| Amendment Flag | false |
| Former Address [Member] | |
| Document And Entity Information [Line Items] | |
| Entity Address Address Line 1 | 93 Worcester St. |
| Entity Address City Or Town | Wellesley |
| Entity Address State Or Province | MA |
| Entity Address Postal Zip Code | 02481 |
