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Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 65,244 $ 48,093
Provision related to current period sales 222,028 106,853
Provision related to prior period sales   (1,305)
Credits/payments made for current period sales (134,337) (56,177)
Credits/payments made for prior period sales (62,358) (34,647)
Ending balance 90,577 62,817
Trade Allowances    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 19,495 12,035
Provision related to current period sales 37,545 19,077
Provision related to prior period sales   (400)
Credits/payments made for current period sales (19,203) (9,097)
Credits/payments made for prior period sales (19,325) (5,282)
Ending balance 18,512 16,333
Rebates, Chargebacks and Discounts    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 41,634 32,064
Provision related to current period sales 164,871 78,051
Provision related to prior period sales   (836)
Credits/payments made for current period sales (98,452) (40,547)
Credits/payments made for prior period sales (41,363) (27,028)
Ending balance 66,690 41,704
Product Returns    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 2,948 1,887
Provision related to current period sales 987 491
Credits/payments made for current period sales 5  
Credits/payments made for prior period sales (471) (40)
Ending balance 3,469 2,338
Other Incentives    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,167 2,107
Provision related to current period sales 18,625 9,234
Provision related to prior period sales   (69)
Credits/payments made for current period sales (16,687) (6,533)
Credits/payments made for prior period sales (1,199) (2,297)
Ending balance $ 1,906 $ 2,442