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Document and Entity Information
Jun. 09, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001653087
Document Type 8-K
Document Period End Date Jun. 09, 2025
Entity Registrant Name Alector, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-38792
Entity Tax Identification Number 82-2933343
Entity Address, Address Line One 131 Oyster Point Blvd.
Entity Address, Address Line Two Suite 600
Entity Address, City or Town South San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94080
City Area Code (415)
Local Phone Number 231-5660
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol ALEC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false