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Business Risk and Credit Risk Concentration Involving Cash - Additional Information (Details) - Customer | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Concentration Risk [Line Items] |  |
Revenue from number of customers | 2 | 1
Europe |  |
Concentration Risk [Line Items] |  |
Revenue from number of customers | 2 |

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- Definition Revenue from contract with customers, number of customers. + References No definition available. + Details
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Namespace Prefix: | astc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |