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Future Minimum Rental Payments Under Non-cancelable Operating Leases (Detail)
Dec. 31, 2018
USD ($)
Commitments And Contingencies [Line Items]  
2019 $ 2,848,000
2020 2,267,000
2021 783,000
2022 487,000
2023 489,000
Thereafter 243,000
Total $ 7,117,000