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Accounts Receivable and Sales Concentrations - Summary of Accounts Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]        
Trade $ 110,165 $ 94,502    
Less - allowance for doubtful accounts 1,719 1,069 $ 1,055 $ 362
Accounts receivable, net $ 108,446 $ 93,433