| Document And Entity Information | Jan. 08, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 08, 2024 |
| Entity Registrant Name | Allurion Technologies, Inc. |
| Entity Central Index Key | 0001964979 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-41767 |
| Entity Incorporation, State or Country Code | DE |
| 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 Ex Transition Period | false |
| Common Stock Par Value 0.0001 Per Share [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common stock, par value $0.0001 per share |
| Trading Symbol | ALUR |
| Security Exchange Name | NYSE |
| Warrants To Purchase1.420455 Shares Of Common Stock Each At An Exercise Price Of8.10 Per Share Of Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase 1.420455 shares of common stock, each at an exercise price of $8.10 per share of common stock |
| Trading Symbol | ALUR WS |
| Security Exchange Name | NYSE |
