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Capital Stock and Stockholders' Deficit - Schedule of Preferred Stock Details Prior to Business Combination (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized | 100,000,000 | 100,000,000 | 100,000,000
Preferred Stock Issued |  | 0 | 0
Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 21,029,888 |
Preferred Stock Issued |  | 19,921,042 |
Carrying Value |  | $ 97,216 |
Series A Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 2,276,786 |
Preferred Stock Issued |  | 2,276,786 |
Carrying Value |  | $ 1,542 |
Series A-1 Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 1,513,028 |
Preferred Stock Issued |  | 1,486,048 |
Carrying Value |  | $ 2,842 |
Series B Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 2,298,929 |
Preferred Stock Issued |  | 2,245,515 |
Carrying Value |  | $ 5,253 |
Series C Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 8,113,616 |
Preferred Stock Issued |  | 7,927,446 |
Carrying Value |  | $ 39,122 |
Series D-1 Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 1,684,565 |
Preferred Stock Issued |  | 842,283 |
Carrying Value |  | $ 9,614 |
Series D-2 Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 3,644,616 |
Preferred Stock Issued |  | 3,644,616 |
Carrying Value |  | $ 24,054 |
Series D-3 Preferred Stock | Legacy Allurion |  |  |
Class of Stock [Line Items] |  |  |
Preferred Stock Authorized |  | 1,498,348 |
Preferred Stock Issued |  | 1,498,348 |
Carrying Value |  | $ 14,789 |

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