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Cover
Aug. 03, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 03, 2022
Entity File Number 000-29959
Entity Registrant Name Cassava Sciences, Inc.
Entity Central Index Key 0001069530
Entity Tax Identification Number 91-1911336
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 7801 N. Capital of Texas Highway, 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