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Fair Value Measurements - Schedule of Assumptions used in Pricing Model (Details) - Black-Scholes Option Pricing Model - Level 3 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Interest Rate | Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 0.0395 |
Interest Rate | Other Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.0399
Interest Rate | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0359 | 0.0395 |
Interest Rate | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0358 |  |
Interest Rate | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0358 |  |
Interest Rate | Legacy Allurion Series A 1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.0442
Interest Rate | Legacy Allurion Series B Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.0441
Interest Rate | Legacy Allurion Series C Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.0411
Interest Rate | Legacy Allurion Series C Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0365 | 0.0388 | 0.0392
Interest Rate | Legacy Allurion Series D-1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 0.0388 |
Interest Rate | Legacy Allurion Series D-1 Preferred Stock Warrants | Minimum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0365 |  | 3.88
Interest Rate | Legacy Allurion Series D-1 Preferred Stock Warrants | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0371 |  | 3.92
Exercise Price | Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 1.05 |
Exercise Price | Other Common Stock Warrants | Minimum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 1.02
Exercise Price | Other Common Stock Warrants | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 1.1
Exercise Price | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 1.05 | 1.05 |
Exercise Price | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 1.2 |  |
Exercise Price | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 1.2 |  |
Exercise Price | Legacy Allurion Series A 1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 1.9
Exercise Price | Legacy Allurion Series B Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 2.38
Exercise Price | Legacy Allurion Series C Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.01
Exercise Price | Legacy Allurion Series C Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 6.73 | 6.73 | 6.58
Exercise Price | Legacy Allurion Series D-1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 12.14 | 12.14 | 11.87
Estimated Fair Value of Underlying Share Price | Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 3.74 |
Estimated Fair Value of Underlying Share Price | Other Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 4.54
Estimated Fair Value of Underlying Share Price | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.61 | 3.74 |
Estimated Fair Value of Underlying Share Price | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.61 |  |
Estimated Fair Value of Underlying Share Price | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.61 |  |
Estimated Fair Value of Underlying Share Price | Legacy Allurion Series A 1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 6.75
Estimated Fair Value of Underlying Share Price | Legacy Allurion Series B Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 6.91
Estimated Fair Value of Underlying Share Price | Legacy Allurion Series C Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 4.54
Estimated Fair Value of Underlying Share Price | Legacy Allurion Series C Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.61 | 3.74 | 7.24
Estimated Fair Value of Underlying Share Price | Legacy Allurion Series D-1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.61 | 3.74 | 11.31
Expected Volatility | Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 1 |
Expected Volatility | Other Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 63
Expected Volatility | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 | 1 |
Expected Volatility | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 |  |
Expected Volatility | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 |  |
Expected Volatility | Legacy Allurion Series A 1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.69
Expected Volatility | Legacy Allurion Series B Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.65
Expected Volatility | Legacy Allurion Series C Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  |  | 0.63
Expected Volatility | Legacy Allurion Series C Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 | 1 | 0.63
Expected Volatility | Legacy Allurion Series D-1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 | 1 | 63
Expected Life (Years) | Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  | 3 years 8 months 8 days |
Expected Life (Years) | Other Common Stock Warrants | Minimum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  |  | 4 years 7 months 6 days
Expected Life (Years) | Other Common Stock Warrants | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  |  | 4 years 8 months 12 days
Expected Life (Years) | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 2 years 11 months 8 days | 3 years 8 months 8 days |
Expected Life (Years) | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 4 years 9 months |  |
Expected Life (Years) | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 4 years 9 months |  |
Expected Life (Years) | Legacy Allurion Series A 1 Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  |  | 3 months
Expected Life (Years) | Legacy Allurion Series B Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  |  | 2 years
Expected Life (Years) | Legacy Allurion Series C Common Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term |  |  | 4 years
Expected Life (Years) | Legacy Allurion Series C Preferred Stock Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 6 years 6 months | 7 years 3 months | 8 years 2 months 12 days
Expected Life (Years) | Legacy Allurion Series D-1 Preferred Stock Warrants | Minimum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 6 years 6 months | 7 years 3 months | 8 years 2 months 12 days
Expected Life (Years) | Legacy Allurion Series D-1 Preferred Stock Warrants | Maximum |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 7 years 11 months 15 days | 8 years 8 months 15 days | 9 years 8 months 12 days

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