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Commitments and Contingencies - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Operating lease right-of-use assets $ 430
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets
Operating lease liabilities $ 430
Operating Lease, Liability, Statement of Financial Position [Extensible List] amsf:AccountsPayableAndOtherLiabilities
Finance lease right-of-use assets $ 185
Finance lease accumulated amortization right-of-use assets (179)
Property and equipment, net $ 6
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet
Finance lease liabilities $ 54
Finance Lease, Liability, Statement of Financial Position [Extensible List] amsf:AccountsPayableAndOtherLiabilities