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Goodwill and Intangible Assets - Estimated Amortization Expense (Detail)
Sep. 30, 2019
USD ($)
Intangible Assets Accumulated Amortization [Abstract]  
Remainder of 2019 $ 127,000
2020 510,000
2021 510,000
2022 510,000
2023 510,000
2024 $ 510,000