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Schedule of Maturity of Operating Lease Liabilities - (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jul. 17, 2020
Operating Lease Liabilities Payments Due [Abstract]    
2021 $ 739  
2022 762  
2023 259  
Total undiscounted lease payments 1,760 $ 500
Less: imputed interest (116)  
Total operating lease liability $ 1,644