v3.26.1
Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)
 12 Months Ended
Nov. 12, 2025
Nov. 11, 2025
Feb. 20, 2025
Feb. 19, 2025
Jan. 27, 2025
Jan. 24, 2025
Jan. 14, 2025
Dec. 19, 2024
Jul. 05, 2024
Jul. 01, 2024
Jun. 28, 2024
Dec. 18, 2023
Aug. 01, 2023
Dec. 31, 2025
Dec. 31, 2024
Class of Stock [Line Items]                              
Preferred stock, shares authorized                           100,000,000 100,000,000
Preferred stock, shares outstanding                           0 0
Preferred stock, par value                           $ 0.0001 $ 0.0001
Warrants converted into warrants exercisable                           7,336,872 767,697
General and administrative                           $ 21,353,000 $ 28,399,000
Number of shares issued                           12,279,181 2,710,607
Number of shares authorized                           1,000,000,000 1,000,000,000
Number of shares outstanding                           12,279,181 2,710,607
Warrants outstanding                           14,380  
Other income (expense), net                           $ 982,000 $ 1,452,000
Common stock, par value                           $ 0.0001 $ 0.0001
Warrants exercisable price                           $ 202.5  
Warrant liabilities                           $ 5,829,000 $ 4,567,000
Issuance of convertible preferred stock for the exercise of warrant (in shares)                         750,394    
Issuance of common stock from equity line financing                           794,000 1,007,000
Additional paid-in capital                           $ 168,627,000 $ 152,596,000
Risk-free interest rate                           3.70% 4.40%
Expected volatility                           108.60% 71.20%
ChEF Purchase Agreement | Chardan Equity Facility                              
Class of Stock [Line Items]                              
Number of shares sold per unit                           377,879  
Amount received on shares sold per unit                           $ 1,800,000  
Issuance of common stock from equity line financing                       $ 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]                              
Conversion of shares               90,407              
Sale of stock                         $ 202.5    
Issuance of common stock from equity line financing (in shares)                           302,418 75,618
Common Stock | Warrants Issued in July 2024                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable                           753,108 753,108
Warrants exercisable price           $ 30               $ 11.42 $ 30
Common Stock | ChEF Purchase Agreement | Chardan Equity Facility                              
Class of Stock [Line Items]                              
Number of shares outstanding                       379,299      
Percentage of common stock, shares, outstanding                       19.99%      
Commitment Shares | ChEF Purchase Agreement | Chardan Equity Facility                              
Class of Stock [Line Items]                              
Number of shares sold per unit                       1,421      
Additional Paid-in Capital                              
Class of Stock [Line Items]                              
Issuance of common stock from equity line financing                           $ 794,000 $ 1,007,000
Public Warrant                              
Class of Stock [Line Items]                              
Warrant liabilities                           $ 13,206,720  
Issuance of convertible preferred stock for the exercise of warrant (in shares)                           750,383  
Private Placement with RTW | Common Stock                              
Class of Stock [Line Items]                              
Aggregate purchase price             $ 2,500,000                
Sale of stock             $ 2.97                
Number of shares sold per unit             841,751                
July 2024 Private Placement Warrants                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable                     90,407        
Net proceeds from offering                   $ 2,500,000          
Offering cost                   $ 200,000          
Leavitt Private Placement                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable       535,372                      
Placement agent fees     $ 100,000                        
Net proceeds from offering     $ 1,300,000                        
Sale of stock       $ 5.23                      
Warrants exercisable price     $ 30                        
Leavitt Private Placement | Common Stock                              
Class of Stock [Line Items]                              
Number of shares sold per unit       267,686                      
January 2025 Private Placement                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable           1,240,000                  
Sale of stock           $ 6                  
February 2025 Offering Warrants                              
Class of Stock [Line Items]                              
Net proceeds from offering     $ 5,200,000                        
Offering cost     400,000                        
Issue-date estimated fair value     5,000,000                        
February 2025 Offering Warrants | Additional Paid-in Capital                              
Class of Stock [Line Items]                              
Net proceeds from offering     600,000                        
January Warrant Repricing                              
Class of Stock [Line Items]                              
Other income (expense), net           $ (500,000)                  
January 2025 Offering                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable           1,240,000                  
January 2025 Offering | Common Stock                              
Class of Stock [Line Items]                              
Number of shares sold per unit           1,240,000                  
Public Offering                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable                   86,440 576,261        
Net proceeds from offering                   $ 15,200,000          
Underwriting discounts                   1,000,000          
Offering cost                   $ 1,000,000          
Sale of stock                     $ 30        
Number of shares sold per unit                   662,701 576,261        
Issuance of common stock from equity line financing                             5,066,000
Public Offering | Common Stock                              
Class of Stock [Line Items]                              
Issuance of common stock from equity line financing                             $ 1,000
Issuance of common stock from equity line financing (in shares)                             653,351
Public Offering | Additional Paid-in Capital                              
Class of Stock [Line Items]                              
Issuance of common stock from equity line financing                             $ 5,065,000
January 2025 Warrants                              
Class of Stock [Line Items]                              
Net proceeds from offering         $ 5,800,000                    
Offering cost         800,000                    
Issue-date estimated fair value         5,300,000                    
January 2025 Warrants | Additional Paid-in Capital                              
Class of Stock [Line Items]                              
Net proceeds from offering         1,300,000                    
Underwriters                              
Class of Stock [Line Items]                              
Net proceeds from offering                 $ 2,200,000            
Number of shares sold per unit                 77,091            
Warrants exercisable price                 $ 30            
February Warrant Repricing                              
Class of Stock [Line Items]                              
Other income (expense), net     $ (200,000)                        
Warrants exercisable price     $ 6                        
Public Offering Warrants and Share Overallotment                              
Class of Stock [Line Items]                              
Net proceeds from offering                   $ 17,400,000          
Offering cost                   800,000          
Issue-date estimated fair value                   13,200,000          
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          
February 2025 Offering                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable       1,800,000                      
February 2025 Offering | Common Stock                              
Class of Stock [Line Items]                              
Number of shares sold per unit       900,000                      
February 2025 Private Placement                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable       1,800,000                      
Sale of stock       $ 5.23                      
February 2025 Offering and February 2025 Private Placement                              
Class of Stock [Line Items]                              
Placement agent fees     $ 400,000                        
Net proceeds from offering     3,900,000                        
Offering cost     $ 400,000                        
November 2025 Private Placement Warrants                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable   2,994,012                          
Sale of stock   $ 1.67                          
January 2025 Offering and January 2025 Private Placement                              
Class of Stock [Line Items]                              
Placement agent fees         600,000                    
Net proceeds from offering         5,800,000                    
Offering cost         $ 1,000,000                    
January 2025 Offering and January 2025 Private Placement | Common Stock | Warrants Issued in July 2024                              
Class of Stock [Line Items]                              
Warrants exercisable price           $ 6                  
November 2025 Offering                              
Class of Stock [Line Items]                              
Warrants converted into warrants exercisable   2,994,012                          
November 2025 Offering | Common Stock                              
Class of Stock [Line Items]                              
Number of shares sold per unit   2,994,012                          
November 2025 Offering and Private Placement                              
Class of Stock [Line Items]                              
Placement agent fees $ 400,000                            
Net proceeds from offering 4,500,000                            
Offering cost 100,000                            
November 2025 Offering Warrants                              
Class of Stock [Line Items]                              
Placement agent fees 400,000                            
Net proceeds from offering 5,000,000                            
Offering cost 400,000                            
Issue-date estimated fair value 3,500,000                            
November 2025 Offering Warrants | Common Stock                              
Class of Stock [Line Items]                              
Net proceeds from offering 1,500,000                            
November 2025 Offering Warrants | Additional Paid-in Capital                              
Class of Stock [Line Items]                              
Net proceeds from offering $ 1,500,000                            
RTW Convertible Notes [Member]                              
Class of Stock [Line Items]                              
Other income (expense), net                           $ 1,100,000  
RTW Convertible Notes [Member] | Series B Convertible Preferred Stock | Exchange Agreement [Member]                              
Class of Stock [Line Items]                              
Preferred stock, par value   $ 0.0001                          
Risk-free interest rate   3.60%                          
Expected volatility   117.50%                          
Compute Health                              
Class of Stock [Line Items]                              
Sale of stock                           $ 10  
Compute Health | IPO                              
Class of Stock [Line Items]                              
Number of shares sold per unit                           1  
Class of Warrant Exchanged                           0.6125  
Compute Health | Public Warrant                              
Class of Stock [Line Items]                              
Number of shares sold per unit                           0.5  
Series A Preferred Stock                              
Class of Stock [Line Items]                              
Preferred stock voting rights                           no  
Dividends declared                           $ 0  
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. The Series A Stockholder Approval was received on December 16, 2024.  
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.Series B Preferred StockOn November 11, 2025, the Company entered into a securities purchase and exchange agreement (the "Exchange Agreement") with certain entities managed by RTW, pursuant to which RTW has agreed to exchange all of the (i) principal amount of the RTW Convertible Notes, purchased pursuant to the terms of the Amended Note Purchase Agreement, including interest accrued on the RTW Convertible Notes; (ii) Company obligations under the Revenue Interest Financing Agreement; and (iii) Company obligations under the New RIFA, for shares of a newly issued series of Series B convertible preferred stock, par value $0.0001 per share ("Series B Preferred Stock") of the Company (the "Exchange"). The Charter authorizes the issuance of up to 100,000,000 shares of Allurion preferred stock. As of December 31, 2025, no shares of Allurion preferred stock were outstanding.  
Shares issued upon conversion               2,260,159              
Series A Preferred Stock | Private Placement with RTW                              
Class of Stock [Line Items]                              
Preferred stock, par value                     $ 0.0001        
Number of shares sold per unit                     2,260,159        
Series A Preferred Stock | July 2024 Private Placement Warrants                              
Class of Stock [Line Items]                              
Offering cost                     $ 200,000        
Issue-date estimated fair value                     1,700,000        
Gross proceeds from offering                     1,000,000        
Reduction in proceeds from offering                     100,000        
General and administrative                     $ 100,000        
Series B Preferred Stock                              
Class of Stock [Line Items]                              
Preferred stock, shares authorized                           100,000,000  
Series B Preferred Stock | Preferred Stock                              
Class of Stock [Line Items]                              
Preferred stock, shares outstanding                           0  
Class A Common Stock                              
Class of Stock [Line Items]                              
Common stock, par value                           $ 0.0001  
Class A Common Stock | Compute Health | IPO                              
Class of Stock [Line Items]                              
Common stock, par value                           $ 0.0001  
Shares issuable for each outstanding warrants exercised                           0.056818