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Revenue Recognition - Summarize Activity of the Net Product Revenue Allowance and Reserve Categories (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | $ 65,244 | $ 48,093
Provision related to current period sales | 369,133 | 175,167
Provision related to prior period sales | (204) | (1,565)
Credits/payments made for current period sales | (249,600) | (106,961)
Credits/payments made for prior period sales | (62,540) | (43,617)
Ending balance | 122,033 | 71,117
Trade Allowances |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 19,495 | 12,035
Provision related to current period sales | 62,177 | 30,814
Provision related to prior period sales |  | (660)
Credits/payments made for current period sales | (34,400) | (15,908)
Credits/payments made for prior period sales | (19,325) | (11,657)
Ending balance | 27,947 | 14,624
Rebates, Chargebacks and Discounts |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 41,634 | 32,064
Provision related to current period sales | 274,439 | 128,905
Provision related to prior period sales | (204) | (836)
Credits/payments made for current period sales | (184,801) | (76,015)
Credits/payments made for prior period sales | (41,363) | (29,594)
Ending balance | 89,705 | 54,524
Product Returns |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 2,948 | 1,887
Provision related to current period sales | 1,635 | 812
Credits/payments made for current period sales | 5 |
Credits/payments made for prior period sales | (653) | (69)
Ending balance | 3,935 | 2,630
Other Incentives |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Beginning balance | 1,167 | 2,107
Provision related to current period sales | 30,882 | 14,636
Provision related to prior period sales |  | (69)
Credits/payments made for current period sales | (30,404) | (15,038)
Credits/payments made for prior period sales | (1,199) | (2,297)
Ending balance | $ 446 | $ (661)

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