v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 12, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name Allurion Technologies, Inc.  
Entity Central Index Key 0001964979  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-41767  
Entity Tax Identification Number 92-2182207  
Entity Address, Address Line One 11 Huron Drive  
Entity Address, City or Town Natick  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01760  
City Area Code 508  
Local Phone Number 647-4000  
Entity Common Stock, Shares Outstanding   15,006,253
Document Quarterly Report true  
Document Transition Report false  
Common Stock, par value $0.0001 per share    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol ALUR  
Warrants to purchase 0.056818 shares of Common Stock for $202.50 per share    
Document Information [Line Items]    
Title of 12(b) Security Warrants to purchase0.056818 shares of Common Stock for $202.50 per share  
Trading Symbol ALUR WS