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Leases - Summary of Maturities of Lease Liabilities (Detail) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Operating Lease Liabilities [Abstract]    
Remainder of 2019 $ 2,461,000  
2020 3,404,000  
2021 2,501,000  
2022 1,909,000  
2023 995,000  
Thereafter 1,932,000  
Total lease payments 13,202,000  
Less:    
Imputed interest (2,048,000)  
Total operating lease liabilities $ 11,154,000 $ 0