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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2023
Feb. 09, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Sales and marketing     $ 5,197,000 $ 13,989,000 $ 18,060,000 $ 36,127,000 $ 46,857,000 $ 50,405,000
Advertising and marketing costs             10,800,000 16,000,000
Uncertain tax positions for which reserves would be required     $ 0 $ 0 $ 0 0 0 0
Proceeds from revenue interest financing           $ 40,000,000 40,000,000  
Revenue Interest Financing Agreement                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Proceeds from revenue interest financing $ 40,000,000              
Shipping and Logistics                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Sales and marketing             3,300,000 3,600,000
Other Long-Term Assets                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Deferred offering costs             $ 0 $ 2,300,000
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 2016-13                
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, 2023  
Change in accounting principle accounting standards update immaterial effect             true  
ASU 2020-06                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Change in accounting principle accounting standards update adopted     true   true      
Change in accounting principle accounting standards update adoption date     Jan. 01, 2024   Jan. 01, 2024      
Change in accounting principle accounting standards update immaterial effect     true   true      
Total Revenue | Customer Concentration Risk | Customers                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Concentration risk, percentage     10.00% 10.00% 10.00% 10.00% 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% 10.00%
Maximum                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Earn-out shares receivable 9,000,000              
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            
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%