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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue From Contract With Customer [Abstract] |
Summarize Activity of the Net Product Revenue Allowance and Reserve Categories | The following tables summarize activity in each of the net product revenue allowance and reserve categories described above for the six months ended June 30, 2019 and 2018:
In thousands |  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance as of December 31, 2018 |  | $ | 19,495 |  |  | $ | 41,634 |  |  | $ | 2,948 |  |  | $ | 1,167 |  |  | $ | 65,244 |
Provision related to current period sales |  |  | 37,545 |  |  |  | 164,871 |  |  |  | 987 |  |  |  | 18,625 |  |  |  | 222,028 |
Provision related to prior period sales |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Credits/payments made for current period sales |  |  | (19,203 | ) |  |  | (98,452 | ) |  |  | 5 |  |  |  | (16,687 | ) |  |  | (134,337 | )
Credits/payments made for prior period sales |  |  | (19,325 | ) |  |  | (41,363 | ) |  |  | (471 | ) |  |  | (1,199 | ) |  |  | (62,358 | )
Balance as of June 30, 2019 |  | $ | 18,512 |  |  | $ | 66,690 |  |  | $ | 3,469 |  |  | $ | 1,906 |  |  | $ | 90,577 |
In thousands |  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance as of December 31, 2017 |  | $ | 12,035 |  |  | $ | 32,064 |  |  | $ | 1,887 |  |  | $ | 2,107 |  |  | $ | 48,093 |
Provision related to current period sales |  |  | 19,077 |  |  |  | 78,051 |  |  |  | 491 |  |  |  | 9,234 |  |  |  | 106,853 |
Provision related to prior period sales |  |  | (400 | ) |  |  | (836 | ) |  |  | — |  |  |  | (69 | ) |  |  | (1,305 | )
Credits/payments made for current period sales |  |  | (9,097 | ) |  |  | (40,547 | ) |  |  | — |  |  |  | (6,533 | ) |  |  | (56,177 | )
Credits/payments made for prior period sales |  |  | (5,282 | ) |  |  | (27,028 | ) |  |  | (40 | ) |  |  | (2,297 | ) |  |  | (34,647 | )
Balance as of June 30, 2018 |  | $ | 16,333 |  |  | $ | 41,704 |  |  | $ | 2,338 |  |  | $ | 2,442 |  |  | $ | 62,817 |

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