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Accounts Payable and Accrued Expenses (Accounts Payable and Accrued Expenses) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract]    
Trade payables $ 16,148 $ 9,580
Accrued payroll and related taxes 7,707 5,402
Sales commissions payable 6,584 4,757
Dividends payable 6,105 4,039
Sales tax payable 596 522
Total $ 37,140 $ 24,300