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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

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