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Leases - Schedule of Undiscounted Future Minimum Payments under Operating Leases (Detail)
$ in Thousands
Jun. 30, 2020
USD ($)
Leases [Abstract]  
2020 (remaining six months) $ 357
2021 865
2022 890
2023 918
2024 928
2025 230
Total undiscounted lease payments 4,188
Less: imputed interest (711)
Total lease liability $ 3,477