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v3.20.4

Credit Facility (Details) - Line of credit | 1 Months Ended
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Sep. 30, 2018 | Nov. 30, 2016 USD ($)
Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Debt instrument term (in years) |  | 3 years
Maximum borrowing capacity |  | $ 25,000,000.0
Debt covenant, net cash equals or exceeds, amount |  | 50,000,000.0
Debt covenant, net cash falls below, amount |  | $ 50,000,000.0
Unused capacity commitment fee |  | 0.40%
Minimum adjusted quick ratio under debt compliance |  | 1.50
Amended Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Unused capacity commitment fee | 0.30% |
Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity |  | $ 25,000,000.0
Prime Rate | Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Variable rate basis spread |  | 0.50%
LIBOR | Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Variable rate basis spread |  | 2.50%

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- Definition Debt Instrument, Covenant Compliance, Minimum Quick Ratio + References No definition available. + Details
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Namespace Prefix: | aten_
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Balance Type: | na
Period Type: | instant

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- Definition Debt Instrument, Covenant Compliance, Net Cash Threshold, Amount Below Threshold + References No definition available. + Details
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Namespace Prefix: | aten_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Debt Instrument, Covenant Compliance, Net Cash Threshold, Equal or Exceeds + References No definition available. + Details
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Balance Type: | debit
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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