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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, 2020
Jun. 30, 2019
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ 128,557 $ 65,244
Provision related to current period sales 361,984 222,028
Provision related to prior period sales (3,872)  
Credits/payments made for current period sales (206,059) (134,337)
Credits/payments made for prior period sales (118,601) (62,358)
Ending balance 162,009 90,577
Trade Allowances    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 29,261 19,495
Provision related to current period sales 59,829 37,545
Credits/payments made for current period sales (23,197) (19,203)
Credits/payments made for prior period sales (29,067) (19,325)
Ending balance 36,826 18,512
Rebates, Chargebacks and Discounts    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 90,997 41,634
Provision related to current period sales 266,823 164,871
Provision related to prior period sales (3,872)  
Credits/payments made for current period sales (152,965) (98,452)
Credits/payments made for prior period sales (85,622) (41,363)
Ending balance 115,361 66,690
Product Returns    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 4,579 2,948
Provision related to current period sales 1,589 987
Credits/payments made for current period sales   5
Credits/payments made for prior period sales (191) (471)
Ending balance 5,977 3,469
Other Incentives    
Valuation And Qualifying Accounts Disclosure [Line Items]    
Beginning balance 3,720 1,167
Provision related to current period sales 33,743 18,625
Credits/payments made for current period sales (29,897) (16,687)
Credits/payments made for prior period sales (3,721) (1,199)
Ending balance $ 3,845 $ 1,906