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Document And Entity Information
Jul. 18, 2024
Document Information [Line Items]  
Entity, Registrant Name Cassava Sciences, Inc.
Document, Type 8-K
Document, Period End Date Jul. 18, 2024
Entity, Incorporation, State or Country Code DE
Entity, File Number 001-41905
Entity, Tax Identification Number 91-1911336
Entity, Address, Address Line One 6801 N Capital of Texas Highway
Entity, Address, Address Line Two Building 1; Suite 300
Entity, Address, City or Town Austin
Entity, Address, State or Province TX
Entity, Address, Postal Zip Code 78731
City Area Code 512
Local Phone Number 501-2444
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity, Emerging Growth Company false
Amendment Flag false
Entity, Central Index Key 0001069530
CommonStock0001ParValue Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol SAVA
Security Exchange Name NASDAQ
WarrantsExercisableForSharesOfCommonStock Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Warrants, exercisable for shares of Common Stock*
Trading Symbol SAVAW
Security Exchange Name NASDAQ