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Business Combination - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 19, 2024
shares
Oct. 22, 2024
USD ($)
shares
Aug. 01, 2023
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Feb. 09, 2023
USD ($)
Business Acquisition [Line Items]                  
Proceeds from revenue interest financing | $           $ 40,000,000      
Warrants outstanding         14,589        
Warrants converted into warrants exercisable         767,697 16,151      
Outstanding public warrants to purchase     750,394            
Transaction costs | $     $ 22,700,000            
Additional paid-in capital | $     15,200,000 $ 143,949,000 $ 152,596,000 $ 143,010,000 $ 150,696,000 $ 144,771,000  
Business combination one-time insurance payment | $     3,600,000            
Warrant liabilities | $       3,329,000 4,567,000 6,765,000 7,381,000 2,113,000  
Earn-out liabilities | $     53,000,000 $ 9,800,000 $ 1,090,000 $ 23,990,000 $ 1,850,000 $ 4,110,000  
General and Administrative                  
Business Acquisition [Line Items]                  
Business combination expense | $     5,000,000            
Fortress Term Loan                  
Business Acquisition [Line Items]                  
Issuance costs | $     $ 2,500,000            
Public Warrants                  
Business Acquisition [Line Items]                  
Warrants outstanding     13,206,922            
Warrant liabilities | $     $ 13,800,000            
Convertible Notes                  
Business Acquisition [Line Items]                  
Aggregate recognition APIC amount | $     25,600,000            
Business Combination Agreement                  
Business Acquisition [Line Items]                  
Sponsor loan excess amount | $     3,700,000            
Revenue Interest Financing Agreement                  
Business Acquisition [Line Items]                  
Proceeds from revenue interest financing | $     40,000,000            
Direct costs and fees | $     1,200,000            
Issuance costs | $     1,200,000            
Revenue Interest Financing Agreement | Maximum                  
Business Acquisition [Line Items]                  
Percentage of annual net sales                 6.00%
Remittance of revenue interest payments percentage                 10.00%
Conversion of RTW PIPE investment to revenue interest finance | $                 $ 7,500,000
Revenue Interest Financing Agreement | New Allurion                  
Business Acquisition [Line Items]                  
Proceeds from revenue interest financing | $     $ 40,000,000            
Revenue Interest Financing Agreement | New Allurion | Maximum                  
Business Acquisition [Line Items]                  
Percentage of annual net sales                 6.00%
Remittance of revenue interest payments percentage                 10.00%
RTW Side Letter                  
Business Acquisition [Line Items]                  
Number of surrender shares of common stock   30,000              
Surrender common stock value | $   $ 7,500,000              
Fortress Credit Agreement                  
Business Acquisition [Line Items]                  
Shares issued     38,000            
Fortress Credit Agreement | Term Loan Facility                  
Business Acquisition [Line Items]                  
Term loan borrowed | $     $ 60,000,000            
Backstop Agreement                  
Business Acquisition [Line Items]                  
Aggregate principal amount | $     $ 2,000,000            
Shares issued upon conversion of convertible notes     28,000            
RSU Forfeiture Agreement                  
Business Acquisition [Line Items]                  
Number of shares forfeited     3,170            
PIPE Subscription Agreements                  
Business Acquisition [Line Items]                  
Aggregate purchase of shares     215,468            
Purchase price per share | $ / shares     $ 176            
Aggregate purchase price | $     $ 37,900,000            
Common Stock                  
Business Acquisition [Line Items]                  
Conversion of shares 90,407                
Shares issued       5,730 75,618        
Common Stock | Convertible Notes                  
Business Acquisition [Line Items]                  
Accured interest | $     $ 21,800,000            
Shares issued upon conversion of convertible notes     132,049            
Common Stock | Business Combination Agreement                  
Business Acquisition [Line Items]                  
Exchange ratio     0.978            
Conversion of shares     21,023            
Sale of stock | $ / shares     $ 202.5            
Common Stock | Business Combination Agreement | Warrant Amendment                  
Business Acquisition [Line Items]                  
Sale of stock | $ / shares     $ 202.5            
Common Stock | RTW Side Letter                  
Business Acquisition [Line Items]                  
Shares issued     10,000            
Common Stock | Backstop Agreement                  
Business Acquisition [Line Items]                  
Shares issued     28,000            
Common Stock | HVL Termination Agreement                  
Business Acquisition [Line Items]                  
Shares issued     15,508            
Common Stock | Gaur Contribution Agreement                  
Business Acquisition [Line Items]                  
Contribution of capital     3,170            
Class A Common Stock | Business Combination Agreement                  
Business Acquisition [Line Items]                  
Conversion of shares     1.420455            
Class A Common Stock | Sponsor Contribution Agreement                  
Business Acquisition [Line Items]                  
Contribution of capital     161,379            
Class A Common Stock | Sponsor Support Agreement                  
Business Acquisition [Line Items]                  
Conversion of shares     1.420455            
Class A Common Stock | Sponsor Support Agreement | CPUH Stockholders                  
Business Acquisition [Line Items]                  
Warrants outstanding     12,833,333            
Warrants converted into warrants exercisable     2,088,327            
Shares issued upon conversion     21,120            
Class B Common Stock | Sponsor Support Agreement | CPUH Stockholders                  
Business Acquisition [Line Items]                  
Recapitalization of common stock     21,442,500            
Recapitalization of additional shares     30,000