Capital Stock and Stockholders' Deficit - Additional Information (Details) - USD ($)			3 Months Ended
	Dec. 18, 2023	Aug. 01, 2023	Mar. 31, 2024	Mar. 31, 2023	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	47,898,737		47,688,096
Public warrant liabilities			$ 3,329,000		$ 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
Stock issued during period value			$ 378,000
Additional paid-in capital		$ 15,200,000	$ 143,946,000		$ 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)				3,554
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			$ 13,206,822
Issuance of Legacy Allurion convertible preferred stock for the exercise of warrants (in shares)			18,759,696
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
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