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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
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