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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2027
Jan. 01, 2027
Dec. 31, 2026
Dec. 30, 2026
Oct. 22, 2024
Aug. 01, 2023
May 02, 2023
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2026
Oct. 30, 2024
Feb. 09, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Sales and marketing               $ 5,197,000 $ 6,718,000 $ 6,145,000 $ 12,863,000 $ 18,060,000 $ 25,933,000 $ 46,857,000      
Advertising and marketing costs                         4,900,000 10,800,000      
Uncertain tax positions for which reserves would be required                         $ 0 $ 0      
Common stock, par value               $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001      
Proceeds from revenue interest financing                           $ 40,000,000      
Right-of-use asset               $ 2,283,000 $ 2,481,000 $ 2,659,000 $ 2,481,000 $ 2,283,000 $ 2,079,000 3,010,000      
Lease liability                         2,213,000        
Revenue Interest Financing Agreement                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Proceeds from revenue interest financing           $ 40,000,000                      
RTW Side Letter                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Number of surrender shares of common stock         30,000                        
Surrender common stock value         $ 7,500,000                        
RTW Side Letter | Revenue Interest Financing Agreement                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Number of surrender shares of common stock         30,000                        
Surrender common stock value         $ 7,500,000                        
Conversion of RTW PIPE investment to revenue interest finance                               $ 7,500,000  
Shipping and Logistics                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Sales and marketing                         900,000 3,300,000      
Other Long-Term Assets                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Deferred offering costs                         $ 0 $ 0      
New Allurion | Revenue Interest Financing Agreement                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Proceeds from revenue interest financing           $ 40,000,000                      
ASU 2020-06                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Change in accounting principle accounting standards update adopted                         true        
Change in accounting principle accounting standards update adoption date                         Jan. 01, 2024        
Change in accounting principle accounting standards update immaterial effect                         true        
ASU 2023-07                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Change in accounting principle accounting standards update adopted                         true        
Change in accounting principle accounting standards update adoption date                         Jan. 01, 2024        
Total Revenue | Customer Concentration Risk | Customers                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Concentration risk, percentage                         10.00% 10.00%      
Accounts Receivable | Customer Concentration Risk | Customers                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Concentration risk, percentage                         10.00% 10.00%      
Forecast | RIFA Amendment                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Percentage of net sales     12.00% 6.00%                          
Percentage of Increase in Net Sales 12.00% 10.00%                              
Percentage of Internal Rate of Return                             20.00%    
Maximum                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Earn-out shares receivable           360,000                      
Maximum | Revenue Interest Financing Agreement                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Percentage of annual net sales                                 6.00%
Remittance of revenue interest payments percentage                                 10.00%
Additional revenue interest             $ 7,500,000                    
Conversion of RTW PIPE investment to revenue interest finance                                 $ 7,500,000
Maximum | New Allurion | Revenue Interest Financing Agreement                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Percentage of annual net sales                                 6.00%
Remittance of revenue interest payments percentage                                 10.00%
Maximum | Forecast | RIFA Amendment                                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                                  
Sales Revenue Net       $ 100,000,000                          
Increase in Sales Revenue Net   $ 100,000,000