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Summarizes Activity of the Product Revenue Allowance and Reserve Categories (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 2,469  
Provision related to current period and deferred sales 4,299 2,234
Provision related to prior period sales 12  
Credits/payments made for current period and deferred sales (2,148) (779)
Credits/payments made for prior period sales (1,837)  
Ending balance 2,795 1,455
Allowance for Trade Receivables
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,071  
Provision related to current period and deferred sales 1,400 1,073
Credits/payments made for current period and deferred sales (411) (566)
Credits/payments made for prior period sales (926)  
Ending balance 1,134 507
Rebates Chargebacks And Discounts
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,137  
Provision related to current period and deferred sales 1,930 259
Credits/payments made for current period and deferred sales (765) (3)
Credits/payments made for prior period sales (911)  
Ending balance 1,391 256
Allowance for Sales Returns
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 72  
Provision related to current period and deferred sales 68 72
Provision related to prior period sales 12  
Ending balance 152 72
Other Incentive Programs
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 189  
Provision related to current period and deferred sales 901 830
Credits/payments made for current period and deferred sales (972) (210)
Ending balance $ 118 $ 620