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Leases - Schedule of Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Leases [Abstract]
Operating Lease, Liability, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityCurrentAndNoncurrent
Operating Leases
2021	$ 20
2022	6
2023	6
Total lease obligations	32
Less: imputed interest	2
Present value of net minimum lease obligations	30
Less: lease liabilities - current	22
Lease liabilities - non-current	8
Financing Leases
2021	3
2022	12
2023	12
2024	12
2025	8
Total lease obligations	47
Less: imputed interest	5
Present value of net minimum lease obligations	42
Less: lease liabilities - current	10
Lease liabilities - non-current	32
Total
2021	23
2022	18
2023	18
2024	12
2025	8
Total lease obligations	79
Less: imputed interest	7
Total lease liabilities	72
Less: lease liabilities - current	32	$ 339
Lease liabilities - non-current	$ 40	$ 623

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