Capital Stock and Stockholders' Deficit - Summary of Warrants to Purchase Classes of Preferred Stock and Common Stock Outstanding (Details) - $ / shares	Sep. 30, 2025	Jan. 24, 2025	Dec. 31, 2024
Class of Warrant or Right [Line Items]
Shares Issuable Upon Exercise of Warrant	4,342,860		767,697
Weighted Average Exercise Price	$ 202.50
December 1, 2014 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)			minus 1 month 6 days
Shares Issuable Upon Exercise of Warrant			209
Weighted Average Exercise Price			$ 61.00
March 30, 2021 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	5 years 6 months		6 years 2 months 12 days
Shares Issuable Upon Exercise of Warrant	5,203		5,203
Weighted Average Exercise Price	$ 168.25		$ 168.25
September 15, 2022 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	7 years		7 years 8 months 12 days
Shares Issuable Upon Exercise of Warrant	1,810		1,810
Weighted Average Exercise Price	$ 303.50		$ 303.50
June 4, 2022 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	6 years 8 months 12 days		7 years 4 months 24 days
Shares Issuable Upon Exercise of Warrant	1,810		1,810
Weighted Average Exercise Price	$ 303.50		$ 303.50
January 17, 2017 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	1 year 3 months 18 days		2 years
Shares Issuable Upon Exercise of Warrant	2,934		2,934
Weighted Average Exercise Price	$ 0.50		$ 0.50
August 3, 2017 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	1 year 9 months 18 days		2 years 7 months 6 days
Shares Issuable Upon Exercise of Warrant	392		392
Weighted Average Exercise Price	$ 28.25		$ 28.25
September 8, 2017 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	1 year 10 months 24 days		2 years 8 months 12 days
Shares Issuable Upon Exercise of Warrant	1,151		1,151
Weighted Average Exercise Price	$ 26.25		$ 26.25
June 19, 2018 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	2 years 8 months 12 days		3 years 6 months
Shares Issuable Upon Exercise of Warrant	720		720
Weighted Average Exercise Price	$ 26.25		$ 26.25
June 25, 2019 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	3 years 8 months 12 days		4 years 6 months
Shares Issuable Upon Exercise of Warrant	360		360
Weighted Average Exercise Price	$ 26.25		$ 26.25
July 1, 2024 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	3 years 9 months 18 days		4 years 6 months
Shares Issuable Upon Exercise of Warrant	753,108		753,108
Weighted Average Exercise Price	$ 11.42	$ 30.00	$ 30.00
January 27, 2025 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	4 years 3 months 18 days
Shares Issuable Upon Exercise of Warrant	1,240,000
Weighted Average Exercise Price	$ 6.00
February 20, 2025 \| Common Stock
Class of Warrant or Right [Line Items]
Remaining Contractual Term (in years)	4 years 4 months 24 days
Shares Issuable Upon Exercise of Warrant	2,335,372
Weighted Average Exercise Price	$ 5.23

ALLURION TECHNOLOGIES, INC. 10-Q