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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 14, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36383    
Entity Registrant Name Five9, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3394123    
Entity Address, Address Line One 3001 Bishop Drive    
Entity Address, Address Line Two Suite 350    
Entity Address, City or Town San Ramon    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94583    
City Area Code 925    
Local Phone Number 201-2000    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol FIVN    
Security Exchange Name NASDAQ    
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 false    
Entity Shell Company false    
Entity Public Float     $ 2,159.9
Entity Common Stock, Shares Outstanding   75,809,562  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2025 Annual Stockholders’ Meeting, which the registrant expects to file with the Securities and Exchange Commission within 120 days of December 31, 2024, are incorporated by reference into Part III (Items 10, 11,12, 13 and 14) of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001288847    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false