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Commitments and Contingencies - Schedule of Future Payments Under Noncancelable Operating Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]    
2020 (remainder of) $ 49  
2021 146  
Total minimum lease payments 195  
Less imputed interest (4)  
Present value of lease liabilities 191  
Less current portion $ (191) $ (180)
Non-current operating lease liability   $ 144