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Cover Page - shares
 6 Months Ended
Jun. 30, 2023
Aug. 01, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2023  
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, par value $0.001 per share  
Trading Symbol FIVN  
Security Exchange Name NASDAQ  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   72,212,312
Entity Central Index Key 0001288847  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q2  
Amendment Flag false