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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 25, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-04321    
Entity Registrant Name ACELYRIN, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-2406735    
Entity Address, Address Line One 4149 Liberty Canyon Road    
Entity Address, City or Town Agoura Hills    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91301    
City Area Code 805    
Local Phone Number 730-0360    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol SLRN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,458.2
Entity Common Stock, Shares Outstanding   98,365,050  
Documents Incorporated by Reference
Portions of the Registrant’s Definitive Proxy Statement relating to the Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after the end of the Registrant’s fiscal year ended December 31, 2023, are incorporated by reference into Part III of this Report.
    
Entity Central Index Key 0001962918    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false