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Commitments and Contingencies - Schedule of Future Payments Under Noncancelable Operating Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]    
2021 $ 146  
Total minimum lease payments 146  
Less imputed interest (2)  
Present value of lease liabilities 144  
Less current portion $ (144) $ (180)
Non-current operating lease liability   $ 144