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Leases - Schedule of Balance Sheet Presentation of Operating and Finance Leases (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jul. 01, 2019
--- | --- | --- | ---
Assets: |  |  |
Operating leases, right-of-use asset, net | $ 851 | $ 414 | $ 1,600
Financing lease assets | $ 52 |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:PropertyPlantAndEquipmentNet |  |
Total lease assets | $ 903 |  |
Liabilities: |  |  |
Operating lease obligations, Current | $ 330 |  |
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 | $ 583 |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityNoncurrent |  |
Financing lease obligations, Non-current | $ 40 |  |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | astc:OperatingAndFinanceLeaseLiabilityNoncurrent |  |
Total lease liabilities | $ 962 |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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