v3.26.1
Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Feb. 24, 2026
Nov. 12, 2025
Nov. 11, 2025
Feb. 20, 2025
Feb. 19, 2025
Jan. 27, 2025
Jan. 24, 2025
Jan. 14, 2025
Jul. 05, 2024
Jul. 01, 2024
Jun. 28, 2024
Dec. 18, 2023
Aug. 01, 2023
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Mar. 06, 2026
Class of Stock [Line Items]                                  
Preferred stock, shares authorized                           100,000,000   100,000,000  
Preferred stock, shares outstanding                           0   0  
Warrants converted into warrants exercisable                           9,996,437   7,336,872  
Preferred stock, par value                           $ 0.0001   $ 0.0001  
Number of shares authorized                           1,000,000,000   1,000,000,000  
Par value common stock                           $ 0.0001   $ 0.0001  
Number of shares outstanding                           14,994,486   12,279,181  
Number of shares issued                           14,994,486   12,279,181  
Warrant liabilities                           $ 5,096,000   $ 5,829,000  
Warrants outstanding                           14,380      
Issuance of convertible preferred stock for the exercise of warrant (in shares)                         750,394        
Warrants exercisable price                           $ 202.5      
Other income (expense), net                           $ 49,000 $ (213,000)    
Changes in fair value of warrants                           (4,324,000) $ (5,669,000)    
Additional paid-in capital                           $ 173,011,000   $ 168,627,000  
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  
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]                                  
Warrants converted into warrants exercisable                                 0.056818
Warrants exercisable price                                 $ 202.5
Sale of stock                         $ 202.5        
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          
Warrants Issued in July 2024 | Common Stock                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable                           753,108   753,108  
Warrants exercisable price             $ 30             $ 11.42   $ 11.42  
RTW Convertible Notes                                  
Class of Stock [Line Items]                                  
Other income (expense), net                           $ 1,100,000      
RTW Convertible Notes | Series B Convertible Preferred Stock | Exchange Agreement                                  
Class of Stock [Line Items]                                  
Preferred stock, par value     $ 0.0001                            
Risk-free interest rate     3.60%                            
Expected volatility     117.50%                            
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      
Public Offering                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable                   86,440 576,261            
Sale of stock                     $ 30            
Number of shares sold per unit                   662,701 576,261            
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 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                  
Underwriters                                  
Class of Stock [Line Items]                                  
Warrants exercisable price                 $ 30                
Number of shares sold per unit                 77,091                
Net proceeds from offering                 $ 2,200,000                
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                    
January 2025 Private Placement                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable             1,240,000                    
Sale of stock             $ 6                    
January 2025 Offering and January 2025 Private Placement                                  
Class of Stock [Line Items]                                  
Net proceeds from offering           $ 5,800,000                      
Placement agent fees           600,000                      
Offering cost           1,000,000                      
January 2025 Offering and January 2025 Private Placement | Warrants Issued in July 2024 | Common Stock                                  
Class of Stock [Line Items]                                  
Warrants exercisable price             $ 6                    
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]                                  
Net proceeds from offering       $ 3,900,000                          
Placement agent fees       400,000                          
Offering cost       $ 400,000                          
Leavitt Private Placement                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable         535,372                        
Warrants exercisable price       $ 30                          
Sale of stock         $ 5.23                        
Net proceeds from offering       $ 1,300,000                          
Placement agent fees       100,000                          
Leavitt Private Placement | Common Stock                                  
Class of Stock [Line Items]                                  
Number of shares sold per unit         267,686                        
January 2025 Warrants                                  
Class of Stock [Line Items]                                  
Issue-date estimated fair value           5,300,000                      
Net proceeds from offering           5,800,000                      
Offering cost           800,000                      
January 2025 Warrants | Common Stock                                  
Class of Stock [Line Items]                                  
Net proceeds from offering           1,300,000                      
January 2025 Warrants | Additional Paid-in Capital                                  
Class of Stock [Line Items]                                  
Net proceeds from offering           $ 1,300,000                      
February 2025 Offering Warrants                                  
Class of Stock [Line Items]                                  
Issue-date estimated fair value       5,000,000                          
Net proceeds from offering       5,200,000                          
Offering cost       400,000                          
February 2025 Offering Warrants | Common Stock                                  
Class of Stock [Line Items]                                  
Net proceeds from offering       600,000                          
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)                    
February Warrant Repricing                                  
Class of Stock [Line Items]                                  
Warrants exercisable price       $ 6                          
Other income (expense), net       $ (200,000)                          
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 Private Placement                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable     2,994,012                            
Sale of stock     $ 1.67                            
November 2025 Offering Warrants                                  
Class of Stock [Line Items]                                  
Issue-date estimated fair value   $ 3,500,000                              
Net proceeds from offering   5,000,000                              
Placement agent fees   400,000                              
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                              
November 2025 Offering and Private Placement                                  
Class of Stock [Line Items]                                  
Net proceeds from offering   4,500,000                              
Placement agent fees   400,000                              
Offering cost   $ 100,000                              
Inducement Letter with Exercising Holders                                  
Class of Stock [Line Items]                                  
Issue-date estimated fair value $ 5,900,000                                
Changes in fair value of warrants $ 1,700,000                                
Inducement Letter with Exercising Holders | Existing Warrants                                  
Class of Stock [Line Items]                                  
Warrants exercisable price $ 1.15                                
Net proceeds from offering $ 2,900,000                                
Placement agent fees 200,000                                
Offering cost $ 100,000                                
Inducement Letter with Exercising Holders | Existing Warrants | Common Stock                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable 2,659,565                                
Inducement Letter with Exercising Holders | New Warrants | Common Stock                                  
Class of Stock [Line Items]                                  
Warrants converted into warrants exercisable 5,319,130                                
Inducement Letter with Exercising Holders | Initial Exercise Date                                  
Class of Stock [Line Items]                                  
Warrants exercisable price $ 1.15                                
Compute Health                                  
Class of Stock [Line Items]                                  
Sale of stock                           $ 10      
Compute Health | Public Warrant                                  
Class of Stock [Line Items]                                  
Number of shares sold per unit                           0.5      
Compute Health | IPO                                  
Class of Stock [Line Items]                                  
Class of Warrant Exchanged                           0.6125      
Number of shares sold per unit                           1      
Class A Common Stock                                  
Class of Stock [Line Items]                                  
Par value common stock                           $ 0.0001      
Number of shares sold per unit                           1      
Class A Common Stock | Compute Health | IPO                                  
Class of Stock [Line Items]                                  
Shares issuable for each outstanding warrants exercised                           0.056818      
Sale of stock                           $ 11.5      
Series B Preferred Stock                                  
Class of Stock [Line Items]                                  
Preferred stock redemption basis                           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"). Allurion's charter authorizes the issuance of up to 100,000,000 shares of Allurion preferred stock. As of March 31, 2026, no shares of Allurion preferred stock were outstanding.      
Preferred stock, shares authorized                           100,000,000      
Series B Preferred Stock | Preferred Stock                                  
Class of Stock [Line Items]                                  
Preferred stock, shares outstanding                           0