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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
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