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Business Combination - Number of Shares of Allurion Common Stock Outstanding (Details) - shares
Sep. 30, 2024
Dec. 31, 2023
Aug. 01, 2023
Dec. 31, 2022
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination 64,369,381 47,688,096 47,301,409 27,079,856
Legacy Allurion Equityholders        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     27,897,387  
CPUH Stockholders        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     5,165,698  
Shares Issued to PIPE Investors        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     5,386,695  
Shares issued to RTW and Fortress        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     1,900,000  
Shares Issued to Convertible Note Holders        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     3,301,222  
CPUH Sponsor Shares        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     3,262,711  
Side Letter Termination Shares        
Business Acquisition [Line Items]        
Total shares of Common Stock immediately after Business Combination     387,696