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Lease Arrangements - Reconciliation of Undiscounted Cash Flows to Operating Lease Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Lease Liabilities Payments Due [Abstract]    
2021 $ 96  
2022 1  
2023 1  
2024 1  
Total minimum lease payments 99  
Less: amount of lease payments representing interest (1)  
Lease liabilities 98 $ 592
Less: current obligation under leases (95) (498)
Non-current lease obligations $ 3 $ 94