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Leases - Schedule of Future Minimum Lease Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020
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Leases [Abstract] |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityCurrentAndNoncurrent |
Operating Leases |  |
2021 | $ 160 |
2022 | 182 |
2023 | 6 |
Total lease obligations | 348 |
Less: imputed interest | 31 |
Present value of net minimum lease obligations | 317 |
Less: lease liabilities - current | 188 |
Lease liabilities - non-current | 129 |
Financing Leases |  |
2021 | 9 |
2022 | 12 |
2023 | 12 |
2024 | 12 |
2025 | 8 |
Total lease obligations | 53 |
Less: imputed interest | 6 |
Present value of net minimum lease obligations | 47 |
Less: lease liabilities - current | 10 |
Lease liabilities - non-current | 37 |
Total |  |
2021 | 169 |
2022 | 194 |
2023 | 18 |
2024 | 12 |
2025 | 8 |
Total lease obligations | 401 |
Less: imputed interest | 37 |
Total lease liabilities | 364 |
Less: lease liabilities - current | 198 | $ 339
Lease liabilities - non-current | $ 166 | $ 623

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