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Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity Registrant Name A10 NETWORKS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-1446869    
Entity Address, Address Line One 2300 Orchard Parkway,    
Entity Address, City or Town San Jose    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95131    
City Area Code 408    
Local Phone Number 325-8668    
Title of 12(b) Security Common Stock, $.00001 Par Value    
Trading Symbol ATEN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 663.7
Entity Common Stock, Shares Outstanding   76,394,402  
Documents Incorporated by Reference Portions of the registrant’s definitive Proxy Statement for the 2022 Annual Stockholders’ Meeting, which the registrant expects to file with the Securities and Exchange Commission within 120 days of December 31, 2021, are incorporated by reference into Part III (Items 10, 11, 12, 13 and 14) of this Annual Report on Form 10-K.    
Entity Shell Company false    
Entity File Number 001-36343    
Amendment Flag false    
Entity Central Index Key 0001580808    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021