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Subsequent Events (Details) - Austin, Texas ft² in Thousands	3 Months Ended
	Sep. 21, 2016 USD ($) ft²	Jun. 30, 2016 ft²
Subsequent Event [Line Items]
Leased premises		5
Subsequent Event
Subsequent Event [Line Items]
Leased premises	6
Monthly rental expense | $	$ 6,000

X

- Definition

Operating Leases, Monthly Rental Expense

+ References

No definition available.

+ Details

Name:	astc_OperatingLeasesMonthlyRentalExpense
Namespace Prefix:	astc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

Name:	us-gaap_StatementGeographicalAxis=astc_AustinTexasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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