| Cover | Apr. 27, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 27, 2021 |
| Entity Registrant Name | A10 NETWORKS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36343 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, $0.00001 par value per share |
| Trading Symbol | ATEN |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001580808 |
