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Redeemable Convertible Preferred Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 05, 2024
Jul. 01, 2024
Jun. 28, 2024
Dec. 18, 2023
Aug. 01, 2023
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]                            
Dividends declared                         $ 0  
Preferred stock, shares authorized           100,000,000         100,000,000   100,000,000 100,000,000
Preferred stock, shares outstanding                         0 0
Warrants converted into warrants exercisable           19,231,301         19,231,301   403,658 436,711
Preferred stock, par value                         $ 0.0001 $ 0.0001
Number of shares authorized           1,000,000,000         1,000,000,000   1,000,000,000 1,000,000,000
Par value common stock           $ 0.0001         $ 0.0001   $ 0.0001 $ 0.0001
Number of shares outstanding         47,301,409 64,369,381         64,369,381   47,688,096 27,079,856
Public warrant liabilities           $ 7,381,000         $ 7,381,000   $ 6,765,000  
Warrants outstanding           403,658         403,658   403,658  
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)         18,759,838                  
Warrants exercisable price           $ 8.1         $ 8.1   $ 8.1  
General and administrative           $ 7,043,000   $ 18,942,000     $ 20,746,000 $ 30,657,000 $ 46,024,000 $ 15,365,000
Stock issued during period value           5,066,000 $ 378,000              
Additional paid-in capital         $ 15,200,000 150,692,000         $ 150,692,000   $ 143,007,000 $ 99,875,000
ChEF Purchase Agreement | Chardan Equity Facility                            
Class of Stock [Line Items]                            
Number of shares sold per unit                     143,234   0  
Amount received on shares sold per unit                     $ 400,000      
Stock issued during period value       $ 100,000,000                    
Additional paid-in capital       100,000                    
Expense of issuance of commitment shares       100,000                    
Structuring fee payable       $ 100,000                    
Common Stock                            
Class of Stock [Line Items]                            
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)               4,976 492 3,554        
Stock issued during period value           2,000                
Common Stock | ChEF Purchase Agreement | Chardan Equity Facility                            
Class of Stock [Line Items]                            
Number of shares outstanding       9,482,468                    
Percentage of common stock, shares, outstanding       19.99%                    
Additional Paid-in Capital                            
Class of Stock [Line Items]                            
Stock issued during period value           5,064,000 $ 378,000              
Commitment Shares | ChEF Purchase Agreement | Chardan Equity Facility                            
Class of Stock [Line Items]                            
Stock issued during period value       $ 35,511                    
Public Warrant                            
Class of Stock [Line Items]                            
Public warrant liabilities           $ 13,206,720         $ 13,206,720   $ 13,206,922  
Warrants outstanding           16,567,484         16,567,484      
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)                     18,759,554   18,759,838  
Public Warrant | Scenario Plan Three                            
Class of Stock [Line Items]                            
Stock price           $ 12.67         $ 12.67   $ 12.67  
Warrants redumption price per share           0.01         0.01   0.01  
Public Warrant | Scenario Plan Four                            
Class of Stock [Line Items]                            
Stock price           7.04         7.04   7.04  
Warrants redumption price per share           $ 0.1         $ 0.1   0.1  
Public Offering                            
Class of Stock [Line Items]                            
Warrants converted into warrants exercisable   2,160,976 14,406,508                      
Sale of stock     $ 1.2                      
Number of shares sold per unit   16,567,484 14,406,508                      
Net proceeds from offering   $ 15,200,000                        
Offering cost   1,000,000                        
Underwriting discounts   1,000,000                        
Public Offering Warrants and Share Overallotment                            
Class of Stock [Line Items]                            
Issue-date estimated fair value   13,200,000                        
Net proceeds from offering   17,400,000                        
Offering cost   800,000                        
Public Offering Warrants and Share Overallotment | Common Stock                            
Class of Stock [Line Items]                            
Net proceeds from offering   5,100,000                        
Public Offering Warrants and Share Overallotment | Additional Paid-in Capital                            
Class of Stock [Line Items]                            
Net proceeds from offering   5,100,000                        
Private Placement Warrants                            
Class of Stock [Line Items]                            
Warrants outstanding           2,260,159         2,260,159      
Private Placement with RTW                            
Class of Stock [Line Items]                            
Warrants converted into warrants exercisable     2,260,159                      
Net proceeds from offering   2,500,000                        
Offering cost   $ 200,000                        
Underwriters                            
Class of Stock [Line Items]                            
Warrants exercisable price $ 1.2                          
Number of shares sold per unit 1,927,265                          
Net proceeds from offering $ 2,200,000                          
Compute Health                            
Class of Stock [Line Items]                            
Sale of stock           $ 10         $ 10   $ 10  
Compute Health | Public Warrant                            
Class of Stock [Line Items]                            
Number of shares sold per unit                     0.5   0.5  
Compute Health | IPO                            
Class of Stock [Line Items]                            
Class of Warrant Exchanged           0.6125         0.6125   0.6125  
Number of shares sold per unit                     1   1  
Class A Common Stock                            
Class of Stock [Line Items]                            
Par value common stock           $ 0.0001         $ 0.0001   $ 0.0001  
Number of shares sold per unit                     1   1  
Class A Common Stock | Compute Health | IPO                            
Class of Stock [Line Items]                            
Shares issuable for each outstanding warrants exercised           1.420455         1.420455   1.420455  
Sale of stock           $ 11.5         $ 11.5   $ 11.5  
Series A Preferred Stock                            
Class of Stock [Line Items]                            
Preferred stock redemption basis                     Each share of Series A Preferred Stock outstanding on December 31, 2026 (the “Redemption Date”) shall be automatically redeemed by the Company for cash at a redemption price equal to the volume-weighted average price per share of the Common Stock on the NYSE during the twenty consecutive trading day period ending and including the trading day immediately preceding the Redemption Date (the “Redemption Price”). The Series A Preferred Stock is redeemable at a determinable price (the Redemption Price) on a fixed date (the Redemption Date), which results in mezzanine equity classification (outside of permanent equity) on the Company’s consolidated balance sheet.      
Preferred stock liquidation preference                     In the event of any voluntary or involuntary liquidation, dissolution, or winding-up of the Company, payment shall be made to the holders of shares of Series A Preferred Stock on a pari passu basis with all holders of Common Stock. Each Series A Preferred Stock holder shall be entitled to receive out of the assets, whether capital or surplus, of the Company the same amount that a holder of Common Stock would receive if such holder’s Series A Convertible Preferred Stock were fully converted to Common Stock plus an additional amount equal to any dividends declared but unpaid to such share.      
Preferred stock conversion rights                     Each share of Series A Preferred Stock is convertible after the date that the Company’s stockholders approve the conversion of the Series A Preferred Stock into shares of Common Stock in accordance with the listing rules of the NYSE (the “Series A Stockholder Approval”). Upon the Series A Stockholder Approval, each share of Series A Preferred Stock then outstanding shall automatically convert into (i) a number of shares of Common Stock equal to the number of Series A Preferred Stock outstanding at the time of conversion, adjustable for certain dilutive events, and (ii) pre-funded conversion warrants in the form agreed by the holder and the Company, exercisable for a number of shares of Common Stock equal to the number of Series A Preferred Stock outstanding at the time of conversion, adjustable for certain dilutive events.      
Preferred stock voting rights                     no      
Dividends declared                     $ 0      
Preferred stock, shares outstanding           2,260,159         2,260,159      
Series A Preferred Stock | Private Placement with RTW                            
Class of Stock [Line Items]                            
Issue-date estimated fair value     $ 1,700,000                      
Preferred stock, par value     $ 0.0001                      
Number of shares sold per unit     2,260,159                      
Gross proceeds from offering     $ 1,000,000                      
Offering cost     200,000                      
Reduction in proceeds from offering     100,000                      
General and administrative     $ 100,000