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Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross trade accounts receivable $ 14,721 $ 10,215
Valuation allowances and reserves (13,264) (7,090)
Accounts receivable, net 11,239 7,842
Trade Receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Valuation allowances and reserves (3,365) (2,207)
Chargebacks    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Valuation allowances and reserves $ (117) $ (166)