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Leases - Summary of Minimum Lease Payments Under Non-cancelable Operating Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
2020 (3 months remaining) $ 325  
2021 2,429  
2022 2,878  
2023 2,959  
2024 2,524  
Total future minimum lease payments 11,115  
Less: discount (2,708)  
Total operating lease obligations 8,407  
Less current operating lease obligations (1,715) $ (2,393)
Noncurrent operating lease obligations $ 6,692 $ 7,840