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Fair Value Measurements - Schedule of Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value at Issuance Date and on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | $ 23,749 | $ 30,582 | $ 4,925
Total Liabilities | 531 | 5,943 |
Level 1 | Public Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 531 | 5,943 |
Level 1 | Money Market Funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | 23,749 | 30,582 | 4,925
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 93,155 | 68,520 | 2,551
Level 3 | Legacy Allurion Common Stock Warrant Liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 71 | 821 |
Level 3 | Public Offering Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 5,970 |  |
Level 3 | Revenue Interest Financing |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 38,500 | 36,200 |
Level 3 | PIPE Conversion Option |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 9,850 | 5,600 |
Level 3 | Earn-out Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 1,850 | 23,990 |
Level 3 | RTW Convertible Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 36,090 |  |
Level 3 | Term Loan Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  | 1,895 |
Level 3 | Success Fee Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 14 | 14 | 180
Level 3 | Legacy Allurion Series C Common Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 340
Level 3 | Legacy Allurion Series B Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 303
Level 3 | Legacy Allurion Series A-1 Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 82
Level 3 | Other Common Stock Warrant Liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 255
Level 3 | Legacy Allurion Series C Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 684
Level 3 | Legacy Allurion Series D-1 Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 707
Private Placement Warrants | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 810 |  |
Total Carrying Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | 23,749 | 30,582 | 4,925
Total Liabilities | 93,686 | 74,463 | 2,551
Total Carrying Value | Legacy Allurion Common Stock Warrant Liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 71 | 821 |
Total Carrying Value | Public Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 531 | 5,943 |
Total Carrying Value | Public Offering Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 5,970 |  |
Total Carrying Value | Revenue Interest Financing |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 38,500 | 36,200 |
Total Carrying Value | PIPE Conversion Option |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 9,850 | 5,600 |
Total Carrying Value | Earn-out Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 1,850 | 23,990 |
Total Carrying Value | RTW Convertible Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 36,090 |  |
Total Carrying Value | Term Loan Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  | 1,895 |
Total Carrying Value | Success Fee Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | 14 | 14 | 180
Total Carrying Value | Legacy Allurion Series C Common Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 340
Total Carrying Value | Legacy Allurion Series B Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 303
Total Carrying Value | Legacy Allurion Series A-1 Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 82
Total Carrying Value | Other Common Stock Warrant Liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 255
Total Carrying Value | Legacy Allurion Series C Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 684
Total Carrying Value | Legacy Allurion Series D-1 Preferred Stock Warrant Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities |  |  | 707
Total Carrying Value | Money Market Funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Assets | 23,749 | $ 30,582 | $ 4,925
Total Carrying Value | Private Placement Warrants |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total Liabilities | $ 810 |  |

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