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Leases - Schedule of Lease Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]    
Operating lease assets $ 786 $ 965
Finance lease assets $ 6,781 $ 9,302
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Total lease assets $ 7,567 $ 10,267
Operating lease liabilities current 362 364
Finance lease liabilities current 648 3,440
Operating lease liabilities non-current 490 650
Total long term finance lease obligations to related parties 0 648
Total lease liabilities $ 1,500 $ 5,102