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Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross trade accounts receivable $ 19,292 $ 18,270    
Valuation allowances and reserves (19,865) (15,796) $ (8,545) $ (7,090)
Accounts receivable, net 15,019 13,826    
Trade Receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowances and reserves (4,043) (4,296) $ (2,946) $ (2,207)
Chargebacks        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowances and reserves $ (230) $ (148)