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Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross trade accounts receivable $ 18,270 $ 10,215  
Valuation allowances and reserves (15,796) (7,090) $ (2,469)
Accounts receivable, net 13,826 7,842  
Trade Receivables      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Valuation allowances and reserves (4,296) (2,207) $ (1,071)
Chargebacks      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Valuation allowances and reserves $ (148) $ (166)