| Document and Entity Information | 12 Months Ended |
| Dec. 31, 2022 | |
| Cover [Abstract] | |
| Document Type | DEF 14A |
| Amendment Flag | false |
| Entity Registrant Name | A10 NETWORKS, INC. |
| Entity Central Index Key | 0001580808 |
| Pay vs Performance Disclosure | 12 Months Ended | ||
| Dec. 31, 2022 USD ($) $ / shares Target | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | |
| Pay vs Performance Disclosure [Table] | |||
| Pay vs Performance [Table Text Block] | Pay versus Performance Below are the tables and related footnotes for PVP: Dhrupad Trivedi Value of Initial Fixed $100 Investment Base On: Year Summary Compensation Table Total for CEO Compensation Actually Paid to CEO (2) Average Summary Compensation Table Total for Non-CEO NEOs (4) Average Compensation Actually Paid to CEO NEOs (3)(4) The Company Total Shareholder Return Peer Group Total Shareholder Return (1) Net Income (millions) 100-Day Volume Weighted Average Stock Price (5) 2022 4,453,280 4,364,958 944,728 482,296 146.05% 21.81% $46.9 $16.73 2021 3,135,250 7,250,200 1,121,976 1,943,908 142.08% 105.92% $94.9 $15.07 2020 1,003,890 3,421,078 963,386 1,000,274 43.52% 74.45% $17.8 $ 7.74 (1) The Company’s peer group Total Shareholder Return is based on NYSE Technology Index, which is one of the indexes used for purposes of our 10-K performance graph. (2) The following represents the adjustments made to the Summary Compensation Table totals to derive the compensation actually paid to Mr. Trivedi in his role as CEO. Mr. Trivedi served as the CEO through the entire reporting period. Adjustments 2022 2021 2020 Amounts reported in “Stock Awards” column of Summary Compensation Table 2,999,996 1,699,993 — Fair value of outstanding and unvested stock awards that were granted in the current year: 3,237,507 2,156,627 — Change in fair value for stock awards outstanding and unvested at the end of the current year that were granted in a prior year: 17,739 2,940,000 2,165,313 Fair value of stock awards granted and vested in the current year: — 553,941 — Change in fair value for stock awards vested in the current year that were granted in a prior year: (343,571) 164,375 251,875 (3) The following represents the adjustments made to the Summary Compensation Table totals for our non-CEO named executive officers to derive the average compensation actually paid for our non-CEO named executive officers. Adjustments 2022 2021 2020 Amounts reported in “Stock Awards” column of Summary Compensation Table 475,557 499,998 519,585 Fair value of outstanding and unvested stock awards that were granted in the current year: 419,947 634,307 408,087 Change in fair value for stock awards outstanding and unvested at the end of the current year that were granted in a prior year: 1,649 520,860 147,107 Fair value of stock awards granted and vested in the current year — 162,920 — Change in fair value for stock awards vested in the current year that were granted in a prior year: (71,765) 3,843 1,279 Fair value of stock awards forfeited in the current year that were granted in a prior year: 336,707 — 561,933 (4) The named executive officers included in the non-CEO named executive average for each year are as follows: 2022 Messrs. Becker, Bruening, Cochran, and Weber. 2021 Messrs. Becker, Bruening, and Cochran, 2020 Messrs. Becker, Bruening, Cochran, Reiss, and Constantino. (5) Represents 100-Day Volume Weighted Average Stock Price (“VWAP”) as of December 31 of each applicable year. The VWAP metric is used for purposes of determining achievement of our 2022 PSU awards, which are eligible to vest upon the achievement of three distinct VWAP targets during the performance period beginning on the date of grant of the 2022 PSU award and ending on the four (4) year anniversary of such date. | ||
| Company Selected Measure Name | 100-Day Volume Weighted Average Stock Price | ||
| Named Executive Officers, Footnote [Text Block] | (4) The named executive officers included in the non-CEO named executive average for each year are as follows: 2022 Messrs. Becker, Bruening, Cochran, and Weber. 2021 Messrs. Becker, Bruening, and Cochran, 2020 Messrs. Becker, Bruening, Cochran, Reiss, and Constantino. | ||
| Peer Group Issuers, Footnote [Text Block] | (1) The Company’s peer group Total Shareholder Return is based on NYSE Technology Index, which is one of the indexes used for purposes of our 10-K performance graph. | ||
| PEO Total Compensation Amount | $ 4,453,280 | $ 3,135,250 | $ 1,003,890 |
| PEO Actually Paid Compensation Amount | $ 4,364,958 | 7,250,200 | 3,421,078 |
| Adjustment To PEO Compensation, Footnote [Text Block] | (2) The following represents the adjustments made to the Summary Compensation Table totals to derive the compensation actually paid to Mr. Trivedi in his role as CEO. Mr. Trivedi served as the CEO through the entire reporting period. Adjustments 2022 2021 2020 Amounts reported in “Stock Awards” column of Summary Compensation Table 2,999,996 1,699,993 — Fair value of outstanding and unvested stock awards that were granted in the current year: 3,237,507 2,156,627 — Change in fair value for stock awards outstanding and unvested at the end of the current year that were granted in a prior year: 17,739 2,940,000 2,165,313 Fair value of stock awards granted and vested in the current year: — 553,941 — Change in fair value for stock awards vested in the current year that were granted in a prior year: (343,571) 164,375 251,875 | ||
| Non-PEO NEO Average Total Compensation Amount | $ 944,728 | 1,121,976 | 963,386 |
| Non-PEO NEO Average Compensation Actually Paid Amount | $ 482,296 | $ 1,943,908 | $ 1,000,274 |
| Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | (3) The following represents the adjustments made to the Summary Compensation Table totals for our non-CEO named executive officers to derive the average compensation actually paid for our non-CEO named executive officers. Adjustments 2022 2021 2020 Amounts reported in “Stock Awards” column of Summary Compensation Table 475,557 499,998 519,585 Fair value of outstanding and unvested stock awards that were granted in the current year: 419,947 634,307 408,087 Change in fair value for stock awards outstanding and unvested at the end of the current year that were granted in a prior year: 1,649 520,860 147,107 Fair value of stock awards granted and vested in the current year — 162,920 — Change in fair value for stock awards vested in the current year that were granted in a prior year: (71,765) 3,843 1,279 Fair value of stock awards forfeited in the current year that were granted in a prior year: 336,707 — 561,933 | ||
| Total Shareholder Return Vs Peer Group [Text Block] | As discussed in the Compensation Discussion and Analysis, our 100-Day Volume Weighted Average Stock Price is a performance goal in our long-term equity incentive compensation plan, and adjusted EBITDA and revenue are performance goals in our 2022 Executive Cash Incentive Plan. Though TSR and net income are not directly tied to the performance-based compensation paid to the NEOs, the 100-Day Volume Weighted Average Stock Price and the revenue performance measures are components of TSR and net income and, as such, TSR and net income results indirectly impact the compensation actually paid to our NEOs. A comparison of our TSR and the TSR of the reported peer group shows that our TSR for 2022 and 2021 exceeded the reported peer group. | ||
| Tabular List [Table Text Block] | The following metrics represent the three most important financial performance measures used by the Company in setting NEO compensation for the most recent fiscal year: 100-Day Volume Weighted Average Stock Price Revenue Adjusted EBITDA | ||
| Total Shareholder Return Percent | 146.05% | 142.08% | 43.52% |
| Peer Group Total Shareholder Return Percent | 21.81% | 105.92% | 74.45% |
| Net Income (Loss) | $ 46,900,000 | $ 94,900,000 | $ 17,800,000 |
| Company Selected Measure Amount | $ / shares | 16.73 | 15.07 | 7.74 |
| PEO Name | Mr. Trivedi | ||
| Term of of Volume Weighted Average Stock Price | 100 days | ||
| Number of distinct targets | Target | 3 | ||
| Performance Period | 4 years | ||
| Measure [Axis]: 1 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | 100-Day Volume Weighted Average Stock Price | ||
| Measure [Axis]: 2 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Revenue | ||
| Measure [Axis]: 3 | |||
| Pay vs Performance Disclosure [Table] | |||
| Measure Name | Adjusted EBITDA | ||
| PEO [Member] | Adjustment for Amounts Reported in "Stock Awards" Column of Summary Compensation Table [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 2,999,996 | $ 1,699,993 | $ 0 |
| PEO [Member] | Adjustment for Fair Value of Outstanding and Unvested Equity Awards that were Granted in the Current Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 3,237,507 | 2,156,627 | 0 |
| PEO [Member] | Adjustment for Change in Fair Value for Equity Awards Outstanding and Unvested at the End of the Current Year that were Granted in a Prior Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 17,739 | 2,940,000 | 2,165,313 |
| PEO [Member] | Adjustment for Fair Value of Stock Awards Granted and Vested in the Current Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 0 | 553,941 | 0 |
| PEO [Member] | Adjustment for Change in Fair Value for Stock Awards Vested in Current Year that were Granted in Prior Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (343,571) | 164,375 | 251,875 |
| Non-PEO NEO [Member] | Adjustment for Amounts Reported in "Stock Awards" Column of Summary Compensation Table [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 475,557 | 499,998 | 519,585 |
| Non-PEO NEO [Member] | Adjustment for Fair Value of Outstanding and Unvested Equity Awards that were Granted in the Current Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 419,947 | 634,307 | 408,087 |
| Non-PEO NEO [Member] | Adjustment for Change in Fair Value for Equity Awards Outstanding and Unvested at the End of the Current Year that were Granted in a Prior Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 1,649 | 520,860 | 147,107 |
| Non-PEO NEO [Member] | Adjustment for Fair Value of Stock Awards Granted and Vested in the Current Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | 0 | 162,920 | 0 |
| Non-PEO NEO [Member] | Adjustment for Change in Fair Value for Stock Awards Vested in Current Year that were Granted in Prior Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | (71,765) | 3,843 | 1,279 |
| Non-PEO NEO [Member] | Adjustment for Fair Value of Stock Awards Forfeited in Current Year that were Granted in Prior Year [Member] | |||
| Pay vs Performance Disclosure [Table] | |||
| Adjustment to Compensation Amount | $ 336,707 | $ 0 | $ 561,933 |
