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Commitments and Contingencies - Schedule of Future Payments Under Noncancelable Operating Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]    
2021 (remainder of) $ 45  
2022 181  
Total minimum lease payments 226  
Less imputed interest (4)  
Present value of lease liabilities 222  
Less current portion of operating lease liability (177) $ (144)
Non-current operating lease liability $ 45