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Leases - Future Minimum Lease Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
2021 $ 70  
2022 131  
2023 24  
Total lease payments 225  
Less: imputed discount rate (23)  
Carrying value of operating lease liabilities $ 202 $ 257