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Leases - Schedule of Balance Sheet Presentation of Operating and Finance Leases (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Assets:
Operating leases, right-of-use assets, net	$ 937
Financing lease assets	$ 52
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Total lease assets	$ 989
Liabilities:
Operating lease obligations, Current	$ 317
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityCurrent
Financing lease obligations, Current	$ 9
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityCurrent
Operating lease obligations, Non-current	$ 668
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityNoncurrent
Financing lease obligations, Non-current	$ 43
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	astc:OperatingAndFinanceLeaseLiabilityNoncurrent
Total lease liabilities	$ 1,037

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