XML 24 R1.htm IDEA: XBRL DOCUMENT v3.23.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 21, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Entity Registrant Name ICOSAVAX, INC.    
Entity Central Index Key 0001786255    
Entity File Number 001-40655    
Entity Tax Identification Number 82-3640549    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Interactive Data Current Yes    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Address Address Line1 1930 Boren Avenue, Suite 1000    
Entity Address City Or Town Seattle    
Entity Address, State and Province WA    
Entity Incorporation State Country Code DE    
Entity Address Postal Zip Code 98101    
Local Phone Number 737-0085    
City Area Code 206    
Security12b Title Common Stock, $0.0001 par value per share    
Trading Symbol ICVX    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   41,395,981  
Entity Public Float     $ 184
Auditor Name Ernst & Young LLP    
Auditor Location Seattle, Washington    
Auditor Firm ID 42    
Documents Incorporated by Reference

Certain sections of the registrant’s definitive proxy statement for the 2023 annual meeting of stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Form 10-K are incorporated by reference into Part III of this Form 10-K.