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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 [Member] - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets | $ 11,992 | $ 30,582
Total Liabilities | 396 | 5,943
Level 1 | Public Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 396 | 5,943
Level 1 | Money Market Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets | 11,992 | 30,582
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 90,185 | 69,330
Level 3 | Legacy Allurion Common Stock Warrant Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 41 | 821
Level 3 | Public Offering Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 3,630 |
Level 3 | Revenue Interest Financing |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 49,200 | 36,200
Level 3 | PIPE Conversion Option (Restated) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities |  | 6,410
Level 3 | Earn-out Liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 1,090 | 23,990
Level 3 | RTW Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 35,710 |
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
Level 3 | Private Placement Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 500 |
Total Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets | 11,992 | 30,582
Total Liabilities | 90,581 | 75,273
Total Carrying Value | Legacy Allurion Common Stock Warrant Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 41 | 821
Total Carrying Value | Public Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 396 | 5,943
Total Carrying Value | Public Offering Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 3,630 |
Total Carrying Value | Revenue Interest Financing |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 49,200 | 36,200
Total Carrying Value | PIPE Conversion Option (Restated) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities |  | 6,410
Total Carrying Value | Earn-out Liability |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 1,090 | 23,990
Total Carrying Value | RTW Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | 35,710 |
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
Total Carrying Value | Money Market Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets | 11,992 | $ 30,582
Total Carrying Value | Private Placement Warrants |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Liabilities | $ 500 |

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