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Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 2,469  
Provision related to current period and deferred sales 10,720 3,830
Provision related to prior period sales 12  
Credits/payments made for current period and deferred sales (7,601) (2,382)
Credits/payments made for prior period sales (1,836)  
Ending balance 3,764 1,448
Allowance for Trade Receivables
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,071  
Provision related to current period and deferred sales 3,325 1,654
Credits/payments made for current period and deferred sales (2,082) (1,053)
Credits/payments made for prior period sales (926)  
Ending balance 1,388 601
Rebates Chargebacks And Discounts
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,137  
Provision related to current period and deferred sales 4,978 1,009
Credits/payments made for current period and deferred sales (3,301) (460)
Credits/payments made for prior period sales (910)  
Ending balance 1,904 549
Allowance for Sales Returns
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 72  
Provision related to current period and deferred sales 163 72
Provision related to prior period sales 12  
Ending balance 247 72
Other Incentive Programs
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 189  
Provision related to current period and deferred sales 2,254 1,095
Credits/payments made for current period and deferred sales (2,218) (869)
Ending balance $ 225 $ 226