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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 |  |  |  |  |  |

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