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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
Business Acquisition [Line Items]      
Total shares of Common Stock immediately after Business Combination 64,369,381 47,688,096 47,301,409
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