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Debt - Maturities of Borrowings, Net of Discounts and Unamortized Deferred Financing Costs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 6,664  
2020 6,312  
2021 4,437  
2022 1,483  
2023 and thereafter 34  
Total $ 18,930 $ 39,393