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Revenue Recognition - Additional Information (Details) - Source	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Number of revenue resources	2	2

X

- Definition

Number of revenue resources.

+ References

No definition available.

+ Details

Name:	astc_NumberOfRevenueResources
Namespace Prefix:	astc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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