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Business Combination - Number of Shares of Allurion Common Stock Outstanding (Details) - shares | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Aug. 01, 2023
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Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination | 2,710,607 | 2,574,783 | 1,918,927 | 1,915,956 | 1,907,529 | 1,892,058
Legacy Allurion Equityholders |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 1,115,896
CPUH Stockholders |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 206,628
Shares Issued to PIPE Investors |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 215,468
Shares issued to RTW and Fortress |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 76,000
Shares Issued to Convertible Note Holders |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 132,049
CPUH Sponsor Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 130,509
Side Letter Termination Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total shares of Common Stock immediately after Business Combination |  |  |  |  |  | 15,508

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