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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

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