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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