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Leases - Schedule of Balance Sheet Presentation of Operating and Finance Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | ---
Assets: |  |
Operating leases, right-of-use assets, net | $ 287 | $ 851
Financing lease assets | $ 52 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentNet |
Total lease assets | $ 339 |
Liabilities: |  |
Operating lease obligations, Current | $ 188 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityCurrent |
Financing lease obligations, Current | $ 10 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityCurrent |
Operating lease obligations, Non-current | $ 129 |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityNoncurrent |
Financing lease obligations, Non-current | $ 37 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityNoncurrent |
Total lease liabilities | $ 364 |

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