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Summarizes the Impact of Accounts Receivable Reserves on Gross Trade Accounts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross trade accounts receivable $ 49,054 $ 24,127    
Valuation allowances and reserves (46,626) (27,198) $ (32,312) $ (15,796)
Accounts receivable, net 34,610 19,985    
Trade Allowances        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowances and reserves (14,058) (3,743) $ (4,766) $ (4,296)
Chargebacks        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowances and reserves (374) (387)    
Allowance for Doubtful Accounts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowances and reserves $ (12) $ (12)