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Commitments and Contingencies - Future Minimum Commitments Under ASC 842 Under Operating Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 (excluding the nine months ended September 30, 2019) $ 254
2020 1,026
2021 1,058
2022 1,089
2023 1,122
2024 and thereafter 3,126
Total lease payments 7,675
Less: imputed interest (2,541)
Total operating lease liabilities $ 5,134