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Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross trade accounts receivable $ 12,329 $ 10,215
Trade allowances (2,289) (2,207)
Chargebacks (97) (166)
Accounts receivable, net $ 9,943 $ 7,842