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Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 2,469  
Provision related to current period and deferred sales 17,964 7,347
Provision related to prior period sales 12  
Credits/payments made for current period and deferred sales (13,755) (5,270)
Credits/payments made for prior period sales (1,836)  
Ending balance 4,854 2,077
Allowance for Trade Receivables
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,071  
Provision related to current period and deferred sales 5,514 2,839
Credits/payments made for current period and deferred sales (4,120) (1,951)
Credits/payments made for prior period sales (925)  
Ending balance 1,540 888
Rebates Chargebacks And Discounts
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,137  
Provision related to current period and deferred sales 8,335 2,418
Credits/payments made for current period and deferred sales (5,876) (1,484)
Credits/payments made for prior period sales (911)  
Ending balance 2,685 934
Allowance for Sales Returns
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 72  
Provision related to current period and deferred sales 270 72
Provision related to prior period sales 12  
Ending balance 354 72
Other Incentive Programs
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 189  
Provision related to current period and deferred sales 3,845 2,018
Credits/payments made for current period and deferred sales (3,759) (1,835)
Ending balance $ 275 $ 183