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Commitments and Contingencies - Summary of Future Minimum Lease Payments Due under Operating Leases (Detail)
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 (remaining months) $ 107
2020 45
2021 0
2022 0
2023 0
2024 0
Thereafter 0
Total $ 152