Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jul. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Revenue	$ 488,000	$ 127,000
Foreign currency transaction gain (loss)	(10,000)	0
Allowance for doubtful accounts	$ 0	0
Estimated useful life	5 years
Impairment of long-lived assets	$ 0	0
Operating leases, right-of-use asset, net	$ 851,000		$ 414,000	$ 1,600,000
Lease obligation			$ 414,000	$ 1,600,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityCurrentAndNoncurrent		astc:OperatingAndFinanceLeaseLiabilityCurrentAndNoncurrent	astc:OperatingAndFinanceLeaseLiabilityCurrentAndNoncurrent
Cumulative impact of change in accounting policy	$ (199,779,000)	$ (191,698,000)
Adjustment to Opening Retained Earnings Related to Adoption ASC Topic 842 | ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Cumulative impact of change in accounting policy				$ 230,000
Purchased Software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Less Than One Year
Summary Of Significant Accounting Policies [Line Items]
Product sales, description	We recognize revenue from sales of products upon shipment or delivery when control of the product transfers to the customer, depending on the terms of each sale, and when collection is probable. In the circumstance where terms of a product sale include subjective customer acceptance criteria, revenue is deferred until we have achieved the acceptance criteria unless the customer acceptance criteria are perfunctory or inconsequential. We generally offer customers payment terms of less than one year