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Subsequent Events - Additional Information (Details) - Subsequent Events - 2019 Secured Promissory Note $ in Millions | Sep. 03, 2021 USD ($)
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Subsequent Event [Line Items] |
Repayments of note | $ 1.0
Extended maturity date | Sep. 05, 2022

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- Definition Debt instrument extended maturity date. + References No definition available. + Details
Name: | astc_DebtInstrumentExtendedMaturityDate
Namespace Prefix: | astc_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=astc_TwoThousandNineteenSecuredPromissoryNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |