XML 26 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 26, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity Central Index Key 0001069530    
Entity Registrant Name CASSAVA SCIENCES INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 000-29959    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 91-1911336    
Entity Address, Address Line One 6801 N. Capital of Texas Highway, 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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 967,000,000
Entity Common Stock, Shares Outstanding   43,225,211  
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location Austin, Texas    
Warrant [Member]      
Document Information [Line Items]      
Title of 12(b) Security Warrants, exercisable for shares of Common Stock    
Trading Symbol SAVAW    
Security Exchange Name NASDAQ    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol SAVA    
Security Exchange Name NASDAQ