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Business Combination - Number of Shares of Allurion Common Stock Outstanding (Details) - shares | Sep. 30, 2024 | Dec. 31, 2023 | Aug. 01, 2023 | Dec. 31, 2022
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Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination | 64,369,381 | 47,688,096 | 47,301,409 | 27,079,856
Legacy Allurion Equityholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 27,897,387 |
CPUH Stockholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 5,165,698 |
Shares Issued to PIPE Investors |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 5,386,695 |
Shares issued to RTW and Fortress |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 1,900,000 |
Shares Issued to Convertible Note Holders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 3,301,222 |
CPUH Sponsor Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 3,262,711 |
Side Letter Termination Shares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  | 387,696 |

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