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Leases - Schedule of Future Minimum Lease Payments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Jun. 30, 2020
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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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