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Fair Value Measurements - Schedule of Assumptions used in Pricing Model (Details) - Black-Scholes Option Pricing Model - Level 3 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 |  |
Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 |  |
Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.90 |  |
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 |  |
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 |  |
Interest Rate | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0435 |  |
Interest Rate | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0435 |  |
Interest Rate | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.0426 | 0.0395 |
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 | 0.0444 | 0.0388 |
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 | 0.0444 |  |
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 | 0.045 |  |
Exercise Price | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.30 |  |
Exercise Price | Public Offering Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.30 |  |
Exercise Price | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input | 0.2625 | 0.2625 |
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 | 1.6825 | 1.6825 |
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 | 3.035 | 3.035 |
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 | 0.1075 |  |
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 | 0.1075 |  |
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 | 0.1075 | 0.935 |
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 | 0.1075 | 0.935 |
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 | 0.1075 | 0.935 |
Expected Volatility | Legacy Allurion Other Common Stock |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants measurement input |  | 1 |
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 |  | 1 |
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 |  | 1 |
Expected Life (Years) | Private Placement Warrants |  |  |
Fair Value, Assets Measured on Recurring Basis, Observable and Unobservable Input Reconciliation [Line Items] |  |  |
Warrants term | 4 years 6 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 6 months |  |
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 8 months 8 days | 3 years 8 months 8 days |
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 3 months | 7 years 3 months |
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 3 months |  |
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 8 months 15 days | 8 years 8 months 15 days | 7 years 3 months

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