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Leases - Maturities of Lease Liabilities (Detail) - USD ($)
Mar. 31, 2019
Jan. 01, 2019
2019 $ 1,370,000  
2020 1,448,000  
2021 744,000  
2022 439,000  
2023 349,000  
Thereafter 411,000  
Total lease payments 4,761,000  
Less: Imputed interest 336,000  
Present value of lease liabilities $ 4,425,000 $ 4,455,000