v3.25.1
Document and Entity Information
May 01, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 01, 2025
Entity Registrant Name Alnylam Pharmaceuticals, Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-36407
Entity Tax Identification Number 77-0602661
Entity Address, Address Line One 675 West Kendall Street,
Entity Address, Address Line Two Henri A. Termeer Square
Entity Address, City or Town Cambridge
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02142
City Area Code 617
Local Phone Number 551-8200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001178670
Title of 12(b) Security Common Stock, $0.01 par value per share
Trading Symbol ALNY
Security Exchange Name NASDAQ