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Debt - Additional Information (Details)
1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Apr. 16, 2024
USD ($)
Apr. 14, 2024
USD ($)
$ / shares
Aug. 01, 2023
USD ($)
$ / shares
shares
May 02, 2023
USD ($)
Aug. 31, 2023
Sep. 30, 2022
USD ($)
shares
Jan. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Apr. 16, 2024
USD ($)
Sep. 30, 2022
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Aug. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 29, 2023
USD ($)
Debt Instrument [Line Items]                                          
Principal balance                   $ 49,320,000       $ 43,100,000   $ 58,103,000 $ 49,320,000   $ 43,100,000 $ 58,103,000  
Loss on extinguishment of debt/ term loan                     $ 3,929,000           $ 8,713,000 $ 3,929,000 $ 3,929,000    
Warrants converted into warrants exercisable | shares                   19,231,301       403,658   436,711 19,231,301   403,658 436,711  
Proceeds from issuance of convertible notes                                 $ 48,000,000 28,700,000 $ 28,700,000 $ 1,103,000  
Repayment of convertible debt                                   10,750,000 10,750,000    
Other income, net                   $ 757,000 389,000           1,928,000 133,000 (643,000) (344,000)  
Gain in fair value of revenue interest financing                   6,700,000             5,400,000        
Change in fair value of revenue interest financing                   5,800,000             600,000   $ (700,000)    
RTW Convertible Notes                                          
Debt Instrument [Line Items]                                          
Principal balance                   49,320,000             49,320,000        
Issuance costs                   1,400,000             1,400,000        
Proceeds from issuance of convertible notes                                 49,100,000        
Other income, net                                 1,100,000        
Gain in fair value of revenue interest financing                   1,800,000             10,000,000        
Change in fair value of revenue interest financing                   3,100,000             $ 3,000,000        
Backstop Agreement                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes     $ 2,000,000                                    
Shares issued upon conversion of outstanding notes | shares     700,000                                    
Fortress Credit Agreement                                          
Debt Instrument [Line Items]                                          
Interest, frequency of payment                                 The Fortress Term Loan had a maturity date of June 30, 2027 and accrued interest per annum at a rate of 6.44% plus the greater of (i) the Wall Street Journal Prime Rate and (ii) 3.0%, which interest was payable in arrears on a monthly basis. The Fortress Term Loan provided for an exit payment equal to 3.0% of the Fortress Term Loan (the “Exit Fee”) due upon prepayment or the maturity date of the Fortress Term Loan, in addition to any early prepayment fee.   The Fortress Term Loan has a maturity date of June 30, 2027 and accrues interest per annum at a rate of 6.44% plus the greater of (i) the Wall Street Journal Prime Rate and (ii) 3.0%, which interest is payable in arrears on a monthly basis. An exit payment equal to 3.0% of the Fortress Term Loan (the “Exit Fee”) is due upon prepayment or the maturity date of the Fortress Term Loan, in addition to any early prepayment fee.    
2021 Convertible Notes                                          
Debt Instrument [Line Items]                                          
Interest expense                                     $ 100,000 100,000  
Proceeds from issuance of convertible notes               $ 2,000,000                          
Interest rate               5.00%                          
Debt instrument, term               36 months                          
Debt instrument maturity date                             Dec. 31, 2026            
Unamortized debt issuance costs               $ 0                          
Conversion divided by capped conversion price               600,000,000                          
2021 Convertible Notes | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     133,617                                    
Aggregate recognition APIC amount     $ 2,200,000                                    
2021 Convertible Notes | Maximum                                          
Debt Instrument [Line Items]                                          
Interest expense                     100,000             100,000      
2022 Convertible Notes                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes             $ 1,100,000                            
Interest rate             5.00%                            
Debt instrument, term             36 months                            
2022 Convertible Notes | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     83,216                                    
Aggregate recognition APIC amount     $ 1,200,000                                    
2022 Convertible Notes | Maximum                                          
Debt Instrument [Line Items]                                          
Interest expense                     100,000             100,000 100,000 200,000  
2023 Convertible Notes                                          
Debt Instrument [Line Items]                                          
Interest expense                     100,000             500,000 500,000    
Proceeds from issuance of convertible notes                             $ 28,700,000            
Repayment of principal     500,000                                    
Interest rate         7.00%                   7.00%            
Debt instrument maturity date                             Dec. 31, 2026            
Conversion divided by discounted capped conversion price                             $ 217,300,000            
Capped price                             $ 260,000,000            
Percentage of conversion discounted price is calculated of cash price                             85.00%            
Repayment of convertible debt     2,000,000                                    
Debt prepayment penalty     $ 1,500,000                                    
Initial conversion price per share | $ / shares     $ 7.04                                    
2023 Convertible Notes | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     3,084,389                                    
Aggregate recognition APIC amount     $ 22,200,000                                    
Side Letter Holder Bridge Note                                          
Debt Instrument [Line Items]                                          
Principal balance     6,300,000                                    
Proceeds from issuance of convertible notes     $ 2,700,000                                    
Shares issued upon conversion of outstanding notes | shares     387,696                                    
Aggregate recognition APIC amount     $ 2,700,000                                    
Repayment of convertible debt     6,300,000                                    
Debt instrument, convertible price for calculating equity securities     $ 5                                    
Deferred liability for issuance of additional shares       $ 3,400,000                                  
Side Letter Holder Bridge Note | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     300,000                                    
Side Letter Holder Bridge Note | Minimum                                          
Debt Instrument [Line Items]                                          
Repayment of convertible debt     $ 6,000,000                                    
Side Letter Holder Bridge Note | Backstop Agreement                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes     2,000,000                                    
Deferred liability for issuance of additional shares       3,300,000                                  
Side Letter Holder Bridge Note | Backstop Agreement | Maximum                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes       2,000,000                                  
Note Purchase Agreement | RTW Convertible Notes                                          
Debt Instrument [Line Items]                                          
Interest rate   6.00%                                      
Debt instrument maturity date   Apr. 16, 2031                                      
Principal amount   $ 48,000,000                                      
Note Purchase Agreement | Common Stock | RTW Convertible Notes                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes   $ 15,000,000                                      
Initial conversion rate   617.284                                      
Debt instrument, principal amount for conversion into common stock   $ 1,000                                      
Initial conversion price per share | $ / shares   $ 1.62                                      
Premium percentage of stock price trigger   35.00%                                      
Maximum percentage of number of shares of common stock outstanding   1.00%                                      
Note Purchase Agreement | Maximum                                          
Debt Instrument [Line Items]                                          
Unrestricted cash   $ 12,500,000                                      
HVL Bridge Note                                          
Debt Instrument [Line Items]                                          
Principal balance     6,300,000                                    
Proceeds from issuance of convertible notes     $ 2,700,000                                    
Shares issued upon conversion of outstanding notes | shares     387,696                                    
Aggregate recognition APIC amount     $ 2,700,000                                    
Repayment of convertible debt     6,300,000                                    
Debt instrument, convertible price for calculating equity securities     $ 5                                    
Deferred liability for issuance of additional shares       3,400,000                                  
HVL Bridge Note | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     300,000                                    
HVL Bridge Note | Minimum                                          
Debt Instrument [Line Items]                                          
Repayment of convertible debt     $ 6,000,000                                    
HVL Bridge Note | Backstop Agreement                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes     2,000,000                                    
Deferred liability for issuance of additional shares       3,300,000                                  
HVL Bridge Note | Backstop Agreement | Maximum                                          
Debt Instrument [Line Items]                                          
Proceeds from issuance of convertible notes       $ 2,000,000                                  
2021 Term Loan                                          
Debt Instrument [Line Items]                                          
Interest expense                     800,000             5,000,000 5,000,000 4,300,000  
Contractual interest                     700,000             4,700,000 4,700,000 3,800,000  
Amortization of the debt discount                                   100,000 100,000 200,000  
Accretion                                   100,000 100,000 200,000  
Principal balance                               $ 55,000,000       55,000,000  
Amortization of the warrant                                   100,000 100,000 100,000  
2021 Term Loan | Maximum                                          
Debt Instrument [Line Items]                                          
Amortization of the debt discount                     100,000                    
2021 Term Loan | 2021 Term Loan Agreement | Runway                                          
Debt Instrument [Line Items]                                          
Initial cash proceeds                 $ 15,000,000                        
Available capacity based upon the achievement of certain revenue thresholds                 5,000,000                        
Loss on extinguishment of debt/ term loan     3,900,000                                    
Total payoff amount     58,000,000                                    
Repayment of principal     55,000,000                                    
Prepayment fee     1,100,000                                    
Final payment fee     $ 1,600,000                                    
Prepayment fee percentage     2.00%                                    
Original final payment     $ 100,000                                    
Final payment fee percentage     3.00%                                    
Term loan borrowed                 25,000,000                        
2021 Term Loan | 2021 Term Loan Agreement | Runway | Maximum                                          
Debt Instrument [Line Items]                                          
Additional borrowings                 $ 10,000,000                        
2021 Term Loan | Amended 2021 Term Loan Agreement | Runway                                          
Debt Instrument [Line Items]                                          
Additional borrowings                               30,000,000       30,000,000  
Term C Loan | Amended 2021 Term Loan Agreement | Runway                                          
Debt Instrument [Line Items]                                          
Additional borrowings           $ 15,000,000   20,000,000         $ 15,000,000                
Available capacity based upon the achievement of certain revenue thresholds               $ 15,000,000                          
Maturity Date               Dec. 30, 2025                          
Equal monthly principal payments commencing date               Dec. 30, 2024                          
Issuance costs           $ 300,000   $ 700,000         $ 300,000                
Fair value of the warrants                   300,000       $ 300,000   300,000 $ 300,000   300,000 300,000  
Warrant liability                               $ 400,000       400,000  
Term C Loan | Amended 2021 Term Loan Agreement | Runway | Legacy Allurion Series C Preferred Stock                                          
Debt Instrument [Line Items]                                          
Warrants exercisable | shares               132,979                          
Term C Loan | Amended 2021 Term Loan Agreement | Runway | Common Stock                                          
Debt Instrument [Line Items]                                          
Warrants converted into warrants exercisable | shares     130,053                                    
Term C Loan | Amended 2021 Term Loan Agreement | Runway | Series D-1 Preferred Stock                                          
Debt Instrument [Line Items]                                          
Warrants exercisable | shares                         44,220     88,440          
Term D Loan | Amended 2021 Term Loan Agreement | Runway                                          
Debt Instrument [Line Items]                                          
Additional borrowings                               $ 15,000,000       15,000,000  
Maturity Date           Dec. 30, 2026                              
Interest rate           3.25%                              
Basis spread on variable rate           6.44186%                              
Fair value of the warrants                   800,000       800,000   $ 400,000 800,000   $ 800,000 $ 400,000  
Description of interest rate variable                                     change the interest rate to the higher of the prime rate or 3.25% plus the applicable margin of 6.44186%,    
Term D Loan | Amended 2021 Term Loan Agreement | Runway | Previously Reported                                          
Debt Instrument [Line Items]                                          
Fair value of the warrants                           400,000         $ 400,000    
Term D Loan | Amended 2021 Term Loan Agreement | Runway | Common Stock                                          
Debt Instrument [Line Items]                                          
Warrants converted into warrants exercisable | shares     90,476                                    
Term D Loan | Amended 2021 Term Loan Agreement | Runway | Series D-1 Preferred Stock                                          
Debt Instrument [Line Items]                                          
Warrants exercisable | shares           44,220                              
Warrants converted into warrants exercisable | shares     88,440                                    
Term D Loan | Amended 2021 Term Loan Agreement | Runway | Maximum                                          
Debt Instrument [Line Items]                                          
Additional borrowings           $ 15,000,000             $ 15,000,000                
Fortress Term Loan                                          
Debt Instrument [Line Items]                                          
Principal balance                           43,100,000         $ 43,100,000    
Loss on extinguishment of debt/ term loan                                 8,700,000        
Issuance costs     $ 2,500,000                                    
Fortress Term Loan | Fortress Credit Agreement                                          
Debt Instrument [Line Items]                                          
Initial cash proceeds     $ 60,000,000                                    
Interest expense                   0 1,700,000     4,100,000     2,300,000 1,700,000      
Contractual interest                     1,500,000     3,800,000     1,900,000 1,500,000      
Amortization of the debt discount                     100,000     200,000     300,000 100,000      
Accretion                     $ 100,000     $ 100,000     $ 100,000 $ 100,000      
Interest rate         6.44%           14.94% 14.94%   14.94%              
Basis spread on variable rate     3.00%                                    
Debt instrument exit payment percentage     3.00%                                    
Issuance costs     $ 2,500,000                                    
Debt instrument maturity date                                 Jun. 30, 2027   Jun. 30, 2027    
Minimum Liquidity Amount                                         $ 12,500,000
Increase in interest rate     3.00%                                    
Default interest rate     3.00%                                    
Fair value of term loan derivative liability     $ 1,900,000             $ 0             $ 0        
Gain recorded on derivative                                 $ 2,000,000        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]                                 Other income, net        
Fortress Term Loan | Fortress Amendment                                          
Debt Instrument [Line Items]                                          
Unamortized debt issuance costs                                         800,000
Principal amount                                         20,000,000
Debt fee amount incurred                                         3,100,000
Fortress Term Loan | Fortress Amendment | Until March 31, 2024                                          
Debt Instrument [Line Items]                                          
Minimum Liquidity Amount                                         33,500,000
Fortress Term Loan | Fortress Amendment | From April 1, 2024 to June 30, 2024                                          
Debt Instrument [Line Items]                                          
Minimum Liquidity Amount                                         23,500,000
Fortress Term Loan | Fortress Amendment | From July 1, 2024 to September 30, 2024                                          
Debt Instrument [Line Items]                                          
Minimum Liquidity Amount                                         16,900,000
Fortress Term Loan | Fortress Amendment | On October 1, 2024 and thereafter                                          
Debt Instrument [Line Items]                                          
Minimum Liquidity Amount                                         12,500,000
Fortress Term Loan | Fortress Amendment | Maximum | Common Stock                                          
Debt Instrument [Line Items]                                          
Principal balance                                         $ 20,000,000
Fortress Term Loan | Side Letter Holder Bridge Note | Backstop Agreement | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     950,000                                    
Aggregate recognition APIC amount     $ 13,400,000                                    
Fortress Term Loan | Note Purchase Agreement                                          
Debt Instrument [Line Items]                                          
Total payoff amount $ 48,000,000                                        
Repayment of principal 43,100,000                                        
Prepayment fee 2,700,000                                        
Exit fee 1,300,000                                        
Other fees 600,000                                        
Accrued interest $ 300,000                     $ 300,000                  
Fortress Term Loan | HVL Bridge Note | Backstop Agreement | Common Stock                                          
Debt Instrument [Line Items]                                          
Shares issued upon conversion of outstanding notes | shares     950,000                                    
Aggregate recognition APIC amount     $ 13,400,000