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Business Combination - Additional Information (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 22, 2024 USD ($) shares | Aug. 01, 2023 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Mar. 31, 2024 shares | Sep. 30, 2023 shares | Jun. 30, 2023 shares | Mar. 31, 2023 shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) shares | Feb. 09, 2023 USD ($) | Dec. 31, 2022 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from revenue interest financing | $ |  |  |  |  |  |  |  | $ 40,000,000 | $ 40,000,000 |  |
Warrants outstanding |  |  | 403,658 |  |  |  |  |  | 403,658 |  |
Warrants converted into warrants exercisable |  |  | 19,231,301 |  |  |  |  |  | 403,658 |  | 436,711
Outstanding public warrants to purchase |  | 18,759,838 |  |  |  |  |  |  |  |  |
Transaction costs | $ |  | $ 22,700,000 |  |  |  |  |  |  |  |  |
Additional paid-in capital | $ |  | 15,200,000 | $ 150,692,000 |  |  |  |  |  | $ 143,007,000 |  | $ 99,875,000
Business combination expense | $ |  | 5,000,000 |  |  |  |  |  |  |  |  |
Business combination one-time insurance payment | $ |  | 3,600,000 |  |  |  |  |  |  |  |  |
Warrant liabilities | $ |  |  | 7,381,000 |  |  |  |  |  | 6,765,000 |  |
Earn-out liabilities | $ |  | 53,000,000 | 1,850,000 |  |  |  |  |  | 23,990,000 |  |
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 |  |  |  |  |  |  |  |  |
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 PIPE subscription to revenue interest finance | $ |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 7,500,000 |
Conversion of PIPE investment to revenue interest finance | $ |  |  | $ 7,500,000 |  |  |  |  |  |  | $ 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 | Subsequent Events |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of surrender shares of common stock | 749,998 |  |  |  |  |  |  |  |  |  |
Surrender common stock value | $ | $ 7,500,000 |  |  |  |  |  |  |  |  |  |
Fortress Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 950,000 |  |  |  |  |  |  |  |  |
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 |  | 700,000 |  |  |  |  |  |  |  |  |
RSU Forfeiture Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares forfeited |  | 79,232 |  |  |  |  |  |  |  |  |
PIPE Subscription Agreements |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase of shares |  | 5,386,695 |  |  |  |  |  |  |  |  |
Purchase price per share | $ / shares |  | $ 7.04 |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ |  | $ 37,900,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 16,333,773 | 143,234 |  |  |  |  |  |  |
Outstanding public warrants to purchase |  |  |  |  | 4,976 | 492 | 3,554 |  |  |  |
Common Stock | Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accured interest | $ |  | $ 21,800,000 |  |  |  |  |  |  |  |  |
Shares issued upon conversion of convertible notes |  | 3,301,222 |  |  |  |  |  |  |  |  |
Aggregate recognition APIC amount | $ |  | $ 25,600,000 |  |  |  |  |  |  |  |  |
Common Stock | Business Combination Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exchange ratio |  | 0.978 |  |  |  |  |  |  |  |  |
Conversion of shares |  | 525,568 |  |  |  |  |  |  |  |  |
Sale of stock | $ / shares |  | $ 8.1 |  |  |  |  |  |  |  |  |
Common Stock | Business Combination Agreement | Warrant Amendment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock | $ / shares |  | $ 8.1 |  |  |  |  |  |  |  |  |
Common Stock | RTW Side Letter |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 250,000 |  |  |  |  |  |  |  |  |
Common Stock | Backstop Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 700,000 |  |  |  |  |  |  |  |  |
Common Stock | HVL Termination Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 387,696 |  |  |  |  |  |  |  |  |
Common Stock | Gaur Contribution Agreement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of capital |  | 79,232 |  |  |  |  |  |  |  |  |
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 | 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 |  |  |  |  |  |  |  |  |

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