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Leases - Maturities of Lease Liabilities (Detail) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
2019 $ 911,000  
2020 1,461,000  
2021 756,000  
2022 453,000  
2023 357,000  
Thereafter 413,000  
Total lease payments 4,351,000  
Less: Imputed interest 299,000  
Present value of lease liabilities $ 4,052,000 $ 4,455,000