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Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 18, 2023 | Aug. 01, 2023 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 100,000,000 |  |  |  |  | 100,000,000 | 100,000,000 | 100,000,000
Preferred stock, shares outstanding |  |  |  |  |  |  |  |  | 0 | 0
Dividends declared |  |  |  |  |  |  |  |  | $ 0 |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001
Number of shares authorized |  |  | 1,000,000,000 |  |  |  |  | 1,000,000,000 | 1,000,000,000 | 1,000,000,000
Number of shares outstanding |  | 47,301,409 | 64,369,381 |  |  |  |  | 64,369,381 | 47,688,096 | 27,079,856
Warrants outstanding |  |  | 403,658 |  |  |  |  | 403,658 | 403,658 |
Par value common stock |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 | $ 0.0001 | $ 0.0001
Warrants exercisable price |  |  | $ 8.1 |  |  |  |  | $ 8.1 | $ 8.1 |
Public warrant liabilities |  |  | $ 7,381,000 |  |  |  |  | $ 7,381,000 | $ 6,765,000 |
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares) |  | 18,759,838 |  |  |  |  |  |  |  |
Stock issued during period value |  |  | 5,066,000 | $ 378,000 |  |  |  |  |  |
Additional paid-in capital |  | $ 15,200,000 | 150,692,000 |  |  |  |  | $ 150,692,000 | $ 143,007,000 | $ 99,875,000
ChEF Purchase Agreement | Chardan Equity Facility |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold per unit |  |  |  |  |  |  |  | 143,234 | 0 |
Stock issued during period value | $ 100,000,000 |  |  |  |  |  |  |  |  |
Expense of issuance of commitment shares | 100,000 |  |  |  |  |  |  |  |  |
Additional paid-in capital | 100,000 |  |  |  |  |  |  |  |  |
Structuring fee payable | $ 100,000 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares) |  |  |  |  | 4,976 | 492 | 3,554 |  |  |
Stock issued during period value |  |  | $ 2,000 |  |  |  |  |  |  |
Common Stock | ChEF Purchase Agreement | Chardan Equity Facility |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding | 9,482,468 |  |  |  |  |  |  |  |  |
Percentage of common stock, shares, outstanding | 19.99% |  |  |  |  |  |  |  |  |
Commitment Shares | ChEF Purchase Agreement | Chardan Equity Facility |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period value | $ 35,511 |  |  |  |  |  |  |  |  |
Public Warrant |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants outstanding |  |  | 16,567,484 |  |  |  |  | 16,567,484 |  |
Public warrant liabilities |  |  | $ 13,206,720 |  |  |  |  | $ 13,206,720 | $ 13,206,922 |
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares) |  |  |  |  |  |  |  | 18,759,554 | 18,759,838 |
Public Warrant | Scenario Plan Three |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants redumption price per share |  |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01 |
Stock price |  |  | 12.67 |  |  |  |  | 12.67 | 12.67 |
Public Warrant | Scenario Plan Four |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants redumption price per share |  |  | 0.1 |  |  |  |  | 0.1 | 0.1 |
Stock price |  |  | 7.04 |  |  |  |  | 7.04 | 7.04 |
Compute Health |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  | $ 10 |  |  |  |  | $ 10 | $ 10 |
Compute Health | IPO |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold per unit |  |  |  |  |  |  |  | 1 | 1 |
Class of Warrant Exchanged |  |  | 0.6125 |  |  |  |  | 0.6125 | 0.6125 |
Compute Health | Public Warrant |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold per unit |  |  |  |  |  |  |  | 0.5 | 0.5 |
Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 21,029,888 |
Preferred stock voting rights |  |  |  |  |  |  |  |  | The Legacy Allurion preferred stockholders voted as a single class together with holders of all other classes and series of stock of Legacy Allurion on all actions to be taken by the stockholders of the Company. The Legacy Allurion preferred stockholders were entitled to the number of votes equal to the number of shares of Legacy Allurion common stock into which the shares held by each holder were then convertible. The Legacy Allurion Series C Preferred Stockholders were entitled to elect two members of the Board of Directors |
Common stock voting rights |  |  |  |  |  |  |  |  | common stockholders were entitled to elect four members of the Board of Directors. |
Revenue milestone |  |  |  |  |  |  |  |  | $ 65,000,000 |
Percentage of shares of common stock held |  |  |  |  |  |  |  |  | 150.00% |
Preferred stock conversion rights |  |  |  |  |  |  |  |  | Each share of Legacy Allurion preferred stock was convertible at any time, at the option of the holder, into one share of Legacy Allurion common stock, based upon a per share conversion factor of each series’ applicable original issuance prices, adjustable for certain dilutive events. Conversion was mandatory upon the closing of an IPO or deSPAC transaction, or upon the election of the holders of a majority of the then-outstanding Legacy Allurion preferred stock. |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  |  | 2,260,159 |  |  |  |  | 2,260,159 |  |
Preferred stock voting rights |  |  |  |  |  |  |  | no |  |
Dividends declared |  |  |  |  |  |  |  | $ 0 |  |
Preferred stock conversion rights |  |  |  |  |  |  |  | Each share of Series A Preferred Stock is convertible after the date that the Company’s stockholders approve the conversion of the Series A Preferred Stock into shares of Common Stock in accordance with the listing rules of the NYSE (the “Series A Stockholder Approval”). Upon the Series A Stockholder Approval, each share of Series A Preferred Stock then outstanding shall automatically convert into (i) a number of shares of Common Stock equal to the number of Series A Preferred Stock outstanding at the time of conversion, adjustable for certain dilutive events, and (ii) pre-funded conversion warrants in the form agreed by the holder and the Company, exercisable for a number of shares of Common Stock equal to the number of Series A Preferred Stock outstanding at the time of conversion, adjustable for certain dilutive events. |  |
Series A Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 2,276,786 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 1.092 |
Original issue price |  |  |  |  |  |  |  |  | $ 1.092 |
Series A-1 Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 1,513,028 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 2.85 |
Series B Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 2,298,929 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 3.563 |
Series C Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 8,113,616 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 4.935 |
Preferred Stock redemption value to price |  |  |  |  |  |  |  |  | 1.5 |
Series C Preferred Stock | Legacy Allurion | Maximum |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares of redeemable |  |  |  |  |  |  |  |  | 50.00% |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of preferred stock dividend |  |  |  |  |  |  |  |  | 6.00% |
Series D-1 Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 1,684,565 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 17.809 |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 11.8725 |
Series D-2 Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 3,644,616 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 9.338 |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 6.2256 |
Series D-3 Preferred Stock | Legacy Allurion |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 1,498,348 |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  | $ 15.137 |
Preferred stock, par value |  |  |  |  |  |  |  |  | $ 10.0916 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares sold per unit |  |  |  |  |  |  |  | 1 | 1 |
Par value common stock |  |  | $ 0.0001 |  |  |  |  | $ 0.0001 | $ 0.0001 |
Class A Common Stock | Compute Health | IPO |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock |  |  | $ 11.5 |  |  |  |  | $ 11.5 | $ 11.5 |
Shares issuable for each outstanding warrants exercised |  |  | 1.420455 |  |  |  |  | 1.420455 | 1.420455 |

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