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Summarizes Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 7,090 $ 2,469
Provision related to current period and deferred sales 21,968 10,720
Provision related to prior period sales (157) 12
Credits/payments made for current period and deferred sales (12,202) (7,601)
Credits/payments made for prior period sales (6,376) (1,836)
Ending balance 10,323 3,764
Allowance for Trade Receivables    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 2,207 1,071
Provision related to current period and deferred sales 6,044 3,325
Provision related to prior period sales (113)  
Credits/payments made for current period and deferred sales (3,810) (2,082)
Credits/payments made for prior period sales (2,039) (926)
Ending balance 2,289 1,388
Rebates Chargebacks And Discounts    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 3,610 1,137
Provision related to current period and deferred sales 11,957 4,978
Provision related to prior period sales (44)  
Credits/payments made for current period and deferred sales (6,243) (3,301)
Credits/payments made for prior period sales (3,531) (910)
Ending balance 5,749 1,904
Allowance for Sales Returns    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 481 72
Provision related to current period and deferred sales 276 163
Provision related to prior period sales   12
Credits/payments made for prior period sales (14)  
Ending balance 743 247
Other Incentive Programs    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 792 189
Provision related to current period and deferred sales 3,691 2,254
Credits/payments made for current period and deferred sales (2,149) (2,218)
Credits/payments made for prior period sales (792)  
Ending balance $ 1,542 $ 225