Capital Stock and Stockholders' Deficit (Tables)

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Summary of Reserved for Issuance Upon the Potential Conversion or Exercise

The number of shares of Common Stock that have been reserved for issuance upon the potential conversion or exercise, as applicable, of the Company's securities as of December 31, 2025, is as follows:


Outstanding options to purchase Common Stock			256,453
Restricted Stock Units			383,018
Warrants to purchase Common Stock			7,336,872
Shares of Common Stock issued upon the exercise of Public Warrants			750,383
Earn-Out shares			360,000
Convertible Notes			6,241,384
Total			15,328,110

Summary of Warrants to Purchase the Classes of Preferred Stock and Common Stock Outstanding

As of December 31, 2025, there were 14,380 Rollover Warrants outstanding to purchase Common Stock. Upon the closing of the Business Combination, certain Legacy Allurion preferred stock and Legacy Allurion common stock warrants that were converted into Rollover Warrants were determined to be equity classified.

In connection with the equity offerings defined above, the following warrants were outstanding to purchase Common Stock as of December 31, 2025:


December 31, 2025
Issuance Date		Remaining Contractual Term (in years)				Underlying Equity Instrument		Balance Sheet Classification		Shares Issuable Upon Exercise of Warrant				Weighted Average Exercise Price
3/30/2021			5.2			Common stock		Liability			5,203			$	168.25
9/15/2022			6.7			Common stock		Liability			1,810				303.50
6/4/2022			6.4			Common stock		Liability			1,810				303.50
1/17/2017			1.0			Common stock		Equity			2,934				0.50
8/3/2017			1.6			Common stock		Equity			392				28.25
9/8/2017			1.7			Common stock		Liability			1,151				26.25
6/19/2018			2.5			Common stock		Liability			720				26.25
6/25/2019			3.5			Common stock		Liability			360				26.25
7/1/2024			3.5			Common stock		Liability			753,108				11.42
1/27/2025			4.3			Common stock		Liability			1,240,000				6.00
2/20/2025			4.3			Common stock		Liability			2,335,372				5.23
11/11/2025			5.0			Common stock		Liability			2,994,012				1.67
											7,336,872


December 31, 2024
Issuance Date		Remaining Contractual Term (in years)				Underlying Equity Instrument		Balance Sheet Classification		Shares Issuable Upon Exercise of Warrant				Weighted Average Exercise Price
12/1/2014			(0.1	)		Common stock		Equity			209			$	61.00
3/30/2021			6.2			Common stock		Liability			5,203				168.25
9/15/2022			7.7			Common stock		Liability			1,810				303.50
6/4/2022			7.4			Common stock		Liability			1,810				303.50
1/17/2017			2.0			Common stock		Equity			2,934				0.50
8/3/2017			2.6			Common stock		Equity			392				28.25
9/8/2017			2.7			Common stock		Liability			1,151				26.25
6/19/2018			3.5			Common stock		Liability			720				26.25
6/25/2019			4.5			Common stock		Liability			360				26.25
7/1/2024			4.5			Common stock		Liability			753,108				30.00
											767,697