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Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 65,244 $ 48,093
Provision related to current period sales 545,842 258,274
Provision related to prior period sales (324) (1,914)
Credits/payments made for current period sales (419,489) (197,366)
Credits/payments made for prior period sales (62,716) (41,843)
Ending balance 128,557 65,244
Trade Allowances    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 19,495 12,035
Provision related to current period sales 92,378 46,002
Credits/payments made for current period sales (63,288) (29,202)
Credits/payments made for prior period sales (19,324) (9,340)
Ending balance 29,261 19,495
Rebates, Chargebacks and Discounts    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 41,634 32,064
Provision related to current period sales 403,865 190,329
Provision related to prior period sales (324) (1,845)
Credits/payments made for current period sales (312,790) (148,857)
Credits/payments made for prior period sales (41,388) (30,057)
Ending balance 90,997 41,634
Product Returns    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 2,948 1,887
Provision related to current period sales 2,430 1,211
Credits/payments made for current period sales 5  
Credits/payments made for prior period sales (804) (150)
Ending balance 4,579 2,948
Other Incentives    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 1,167 2,107
Provision related to current period sales 47,169 20,732
Provision related to prior period sales   (69)
Credits/payments made for current period sales (43,416) (19,307)
Credits/payments made for prior period sales (1,200) (2,296)
Ending balance $ 3,720 $ 1,167