| Document and Entity Information | Jun. 28, 2024 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001964979 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Jun. 28, 2024 |
| Entity Registrant Name | ALLURION TECHNOLOGIES, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41767 |
| Entity Tax Identification Number | 92-2182207 |
| Entity Address, Address Line One | 11 Huron Drive |
| Entity Address, City or Town | Natick |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01760 |
| City Area Code | (508) |
| Local Phone Number | 647-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | ALUR |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase 1.420455 shares of Common Stock for $8.10 per share |
| Trading Symbol | ALUR WS |
| Security Exchange Name | NYSE |
