Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Summary of Future Minimum Rentals Under Leases (Detail)

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Commitments and Contingencies - Summary of Future Minimum Rentals Under Leases (Detail) - Building Lease Agreement [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Other Commitments [Line Items]  
2019 $ 2,279
2020 2,398
2021 2,211
2022 1,852
2023 1,680
Thereafter 1,730
Total minimum payments $ 12,150