Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)						3 Months Ended			6 Months Ended
	Jul. 05, 2024	Jul. 01, 2024	Jun. 28, 2024	Dec. 18, 2023	Aug. 01, 2023	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, shares authorized									100,000,000	100,000,000
Preferred stock, shares outstanding									0	0
Number of shares authorized									1,000,000,000	1,000,000,000
Par value common stock									$ 0.0001	$ 0.0001
Number of shares outstanding					47,301,409				47,972,989	47,688,096
Public warrant liabilities									$ 2,113,000	$ 5,943,000
Warrants outstanding									403,658
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)					18,759,838
Warrants exercisable price									$ 8.1
Gross proceeds from offering									$ 378,000
Stock issued during period value						$ 378,000
Additional paid-in capital					$ 15,200,000				$ 144,768,000	$ 143,007,000
ChEF Purchase Agreement | Chardan Equity Facility
Class of Stock [Line Items]
Number of shares sold per unit									143,234
Amount received on shares sold per unit									$ 400,000
Stock issued during period value				$ 100,000,000
Additional paid-in capital				100,000
Expense of issuance of commitment shares				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)							492	3,554
Common Stock | Subsequent Events
Class of Stock [Line Items]
Warrants exercisable price	$ 1.2
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]
Public warrant liabilities									$ 13,206,720
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)									18,759,554
Public Warrant | Scenario Plan Three
Class of Stock [Line Items]
Stock price									$ 12.67
Warrants redumption price per share									0.01
Public Warrant | Scenario Plan Four
Class of Stock [Line Items]
Stock price									7.04
Warrants redumption price per share									0.1
Public Offering
Class of Stock [Line Items]
Sale of stock			$ 1.2
Number of shares sold per unit			14,406,508
Public Offering | Subsequent Events
Class of Stock [Line Items]
Number of shares sold per unit	1,927,265
Gross proceeds from offering		$ 17,300,000
Concurrent Private Placement | Subsequent Events
Class of Stock [Line Items]
Gross proceeds from offering		$ 2,700,000
Underwriters
Class of Stock [Line Items]
Number of shares sold per unit			2,160,976
Underwriters | Subsequent Events
Class of Stock [Line Items]
Gross proceeds from offering	$ 2,300,000
Compute Health
Class of Stock [Line Items]
Sale of stock									$ 10
Compute Health | Public Warrant
Class of Stock [Line Items]
Number of shares sold per unit									0.5
Compute Health | IPO
Class of Stock [Line Items]
Class of Warrant Exchanged									0.6125
Number of shares sold per unit									1
Class A Common Stock
Class of Stock [Line Items]
Par value common stock									$ 0.0001
Number of shares sold per unit									1
Class A Common Stock | Compute Health | IPO
Class of Stock [Line Items]
Shares issuable for each outstanding warrants exercised									1.420455
Sale of stock									$ 11.5