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Leases - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Lease [Line Items] |  |
Rent expense | $ 0.5 | $ 0.5
Minimum |  |
Lease [Line Items] |  |
Lease extension | 3 years |
Maximum |  |
Lease [Line Items] |  |
Lease extension | 10 years |

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- Definition Lease [Line Items] + References No definition available. + Details
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Namespace Prefix: | atex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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: |