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Capital Stock and Stockholders' Deficit - Schedule of Preferred Stock Details Prior to Business Combination (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]      
Preferred Stock Authorized 100,000,000 100,000,000 100,000,000
Preferred Stock Issued   0 0
Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   21,029,888  
Preferred Stock Issued   19,921,042  
Carrying Value   $ 97,216  
Series A Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   2,276,786  
Preferred Stock Issued   2,276,786  
Carrying Value   $ 1,542  
Series A-1 Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   1,513,028  
Preferred Stock Issued   1,486,048  
Carrying Value   $ 2,842  
Series B Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   2,298,929  
Preferred Stock Issued   2,245,515  
Carrying Value   $ 5,253  
Series C Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   8,113,616  
Preferred Stock Issued   7,927,446  
Carrying Value   $ 39,122  
Series D-1 Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   1,684,565  
Preferred Stock Issued   842,283  
Carrying Value   $ 9,614  
Series D-2 Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   3,644,616  
Preferred Stock Issued   3,644,616  
Carrying Value   $ 24,054  
Series D-3 Preferred Stock | Legacy Allurion      
Class of Stock [Line Items]      
Preferred Stock Authorized   1,498,348  
Preferred Stock Issued   1,498,348  
Carrying Value   $ 14,789