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Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 18, 2023
Aug. 01, 2023
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]                    
Preferred stock, shares authorized     100,000,000         100,000,000 100,000,000 100,000,000
Preferred stock, shares outstanding                 0 0
Dividends declared                 $ 0  
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
Number of shares outstanding   47,301,409 64,369,381         64,369,381 47,688,096 27,079,856
Warrants outstanding     403,658         403,658 403,658  
Par value common stock     $ 0.0001         $ 0.0001 $ 0.0001 $ 0.0001
Warrants exercisable price     $ 8.1         $ 8.1 $ 8.1  
Public warrant liabilities     $ 7,381,000         $ 7,381,000 $ 6,765,000  
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)   18,759,838                
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  
Stock issued during period value $ 100,000,000                  
Expense of issuance of commitment shares 100,000                  
Additional paid-in capital 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%                  
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]                    
Warrants outstanding     16,567,484         16,567,484    
Public warrant liabilities     $ 13,206,720         $ 13,206,720 $ 13,206,922  
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]                    
Warrants redumption price per share     $ 0.01         $ 0.01 $ 0.01  
Stock price     12.67         12.67 12.67  
Public Warrant | Scenario Plan Four                    
Class of Stock [Line Items]                    
Warrants redumption price per share     0.1         0.1 0.1  
Stock price     7.04         7.04 7.04  
Compute Health                    
Class of Stock [Line Items]                    
Sale of stock     $ 10         $ 10 $ 10  
Compute Health | IPO                    
Class of Stock [Line Items]                    
Number of shares sold per unit               1 1  
Class of Warrant Exchanged     0.6125         0.6125 0.6125  
Compute Health | Public Warrant                    
Class of Stock [Line Items]                    
Number of shares sold per unit               0.5 0.5  
Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 21,029,888  
Preferred stock voting rights                 The Legacy Allurion preferred stockholders voted as a single class together with holders of all other classes and series of stock of Legacy Allurion on all actions to be taken by the stockholders of the Company. The Legacy Allurion preferred stockholders were entitled to the number of votes equal to the number of shares of Legacy Allurion common stock into which the shares held by each holder were then convertible. The Legacy Allurion Series C Preferred Stockholders were entitled to elect two members of the Board of Directors  
Common stock voting rights                 common stockholders were entitled to elect four members of the Board of Directors.  
Revenue milestone                 $ 65,000,000  
Percentage of shares of common stock held                 150.00%  
Preferred stock conversion rights                 Each share of Legacy Allurion preferred stock was convertible at any time, at the option of the holder, into one share of Legacy Allurion common stock, based upon a per share conversion factor of each series’ applicable original issuance prices, adjustable for certain dilutive events. Conversion was mandatory upon the closing of an IPO or deSPAC transaction, or upon the election of the holders of a majority of the then-outstanding Legacy Allurion preferred stock.  
Series A Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares outstanding     2,260,159         2,260,159    
Preferred stock voting rights               no    
Dividends declared               $ 0    
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.    
Series A Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 2,276,786  
Preferred stock liquidation preference per share                 $ 1.092  
Original issue price                 $ 1.092  
Series A-1 Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 1,513,028  
Preferred stock liquidation preference per share                 $ 2.85  
Series B Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 2,298,929  
Preferred stock liquidation preference per share                 $ 3.563  
Series C Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 8,113,616  
Preferred stock liquidation preference per share                 $ 4.935  
Preferred Stock redemption value to price                 1.5  
Series C Preferred Stock | Legacy Allurion | Maximum                    
Class of Stock [Line Items]                    
Percentage of outstanding shares of redeemable                 50.00%  
Series D Preferred Stock                    
Class of Stock [Line Items]                    
Percentage of preferred stock dividend                 6.00%  
Series D-1 Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 1,684,565  
Preferred stock liquidation preference per share                 $ 17.809  
Preferred stock, par value                 $ 11.8725  
Series D-2 Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 3,644,616  
Preferred stock liquidation preference per share                 $ 9.338  
Preferred stock, par value                 $ 6.2256  
Series D-3 Preferred Stock | Legacy Allurion                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized                 1,498,348  
Preferred stock liquidation preference per share                 $ 15.137  
Preferred stock, par value                 $ 10.0916  
Class A Common Stock                    
Class of Stock [Line Items]                    
Number of shares sold per unit               1 1  
Par value common stock     $ 0.0001         $ 0.0001 $ 0.0001  
Class A Common Stock | Compute Health | IPO                    
Class of Stock [Line Items]                    
Sale of stock     $ 11.5         $ 11.5 $ 11.5  
Shares issuable for each outstanding warrants exercised     1.420455         1.420455 1.420455