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Document And Entity Information
May 05, 2022
Document And Entity Information [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 05, 2022
Entity Registrant Name Cassava Sciences, Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 000-29959
Entity Tax Identification Number 91-1911336
Entity Address, Address Line One 7801 N Capital of Texas Highway
Entity Address, Address Line Two Suite 260
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
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol SAVA
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001069530