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Business Combination - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 22, 2024
USD ($)
shares
Aug. 01, 2023
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Mar. 31, 2024
shares
Sep. 30, 2023
shares
Jun. 30, 2023
shares
Mar. 31, 2023
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Feb. 09, 2023
USD ($)
Dec. 31, 2022
USD ($)
shares
Business Acquisition [Line Items]                      
Proceeds from revenue interest financing | $               $ 40,000,000 $ 40,000,000    
Warrants outstanding     403,658           403,658    
Warrants converted into warrants exercisable     19,231,301           403,658   436,711
Outstanding public warrants to purchase   18,759,838                  
Transaction costs | $   $ 22,700,000                  
Additional paid-in capital | $   15,200,000 $ 150,692,000           $ 143,007,000   $ 99,875,000
Business combination expense | $   5,000,000                  
Business combination one-time insurance payment | $   3,600,000                  
Warrant liabilities | $     7,381,000           6,765,000    
Earn-out liabilities | $   53,000,000 1,850,000           23,990,000    
General and Administrative                      
Business Acquisition [Line Items]                      
Business combination expense | $   5,000,000                  
Fortress Term Loan                      
Business Acquisition [Line Items]                      
Issuance costs | $   $ 2,500,000                  
Public Warrants                      
Business Acquisition [Line Items]                      
Warrants outstanding   13,206,922                  
Warrant liabilities | $   $ 13,800,000                  
Business Combination Agreement                      
Business Acquisition [Line Items]                      
Sponsor loan excess amount | $   3,700,000                  
Revenue Interest Financing Agreement                      
Business Acquisition [Line Items]                      
Proceeds from revenue interest financing | $   40,000,000                  
Direct costs and fees | $   1,200,000                  
Issuance costs | $   1,200,000                  
Revenue Interest Financing Agreement | Maximum                      
Business Acquisition [Line Items]                      
Percentage of annual net sales                   6.00%  
Remittance of revenue interest payments percentage                   10.00%  
Conversion of PIPE subscription to revenue interest finance | $                 $ 7,500,000 $ 7,500,000  
Conversion of PIPE investment to revenue interest finance | $     $ 7,500,000             $ 7,500,000  
Revenue Interest Financing Agreement | New Allurion                      
Business Acquisition [Line Items]                      
Proceeds from revenue interest financing | $   $ 40,000,000                  
Revenue Interest Financing Agreement | New Allurion | Maximum                      
Business Acquisition [Line Items]                      
Percentage of annual net sales                   6.00%  
Remittance of revenue interest payments percentage                   10.00%  
RTW Side Letter | Subsequent Events                      
Business Acquisition [Line Items]                      
Number of surrender shares of common stock 749,998                    
Surrender common stock value | $ $ 7,500,000                    
Fortress Credit Agreement                      
Business Acquisition [Line Items]                      
Shares issued   950,000                  
Fortress Credit Agreement | Term Loan Facility                      
Business Acquisition [Line Items]                      
Term loan borrowed | $   $ 60,000,000                  
Backstop Agreement                      
Business Acquisition [Line Items]                      
Aggregate principal amount | $   $ 2,000,000                  
Shares issued upon conversion of convertible notes   700,000                  
RSU Forfeiture Agreement                      
Business Acquisition [Line Items]                      
Number of shares forfeited   79,232                  
PIPE Subscription Agreements                      
Business Acquisition [Line Items]                      
Aggregate purchase of shares   5,386,695                  
Purchase price per share | $ / shares   $ 7.04                  
Aggregate purchase price | $   $ 37,900,000                  
Common Stock                      
Business Acquisition [Line Items]                      
Shares issued     16,333,773 143,234              
Outstanding public warrants to purchase         4,976 492 3,554        
Common Stock | Convertible Notes                      
Business Acquisition [Line Items]                      
Accured interest | $   $ 21,800,000                  
Shares issued upon conversion of convertible notes   3,301,222                  
Aggregate recognition APIC amount | $   $ 25,600,000                  
Common Stock | Business Combination Agreement                      
Business Acquisition [Line Items]                      
Exchange ratio   0.978                  
Conversion of shares   525,568                  
Sale of stock | $ / shares   $ 8.1                  
Common Stock | Business Combination Agreement | Warrant Amendment                      
Business Acquisition [Line Items]                      
Sale of stock | $ / shares   $ 8.1                  
Common Stock | RTW Side Letter                      
Business Acquisition [Line Items]                      
Shares issued   250,000                  
Common Stock | Backstop Agreement                      
Business Acquisition [Line Items]                      
Shares issued   700,000                  
Common Stock | HVL Termination Agreement                      
Business Acquisition [Line Items]                      
Shares issued   387,696                  
Common Stock | Gaur Contribution Agreement                      
Business Acquisition [Line Items]                      
Contribution of capital   79,232                  
Class A Common Stock | Business Combination Agreement                      
Business Acquisition [Line Items]                      
Conversion of shares   1.420455                  
Class A Common Stock | Sponsor Contribution Agreement                      
Business Acquisition [Line Items]                      
Contribution of capital   161,379                  
Class A Common Stock | Sponsor Support Agreement | CPUH Stockholders                      
Business Acquisition [Line Items]                      
Warrants outstanding   12,833,333                  
Warrants converted into warrants exercisable   2,088,327                  
Shares issued upon conversion   21,120                  
Class B Common Stock | Sponsor Support Agreement | CPUH Stockholders                      
Business Acquisition [Line Items]                      
Recapitalization of common stock   21,442,500                  
Recapitalization of additional shares   30,000