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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue From Contract With Customer [Abstract] |
Summarize Activity of the Net Product Revenue Allowance and Reserve Categories | The following table summarizes activity in each of the net product revenue allowance and reserve categories described above for the years ended December 31, 2018 and 2017:
In thousands |  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance as of January 1, 2017 |  | $ | 3,743 |  |  | $ | 20,915 |  |  | $ | 859 |  |  | $ | 1,681 |  |  | $ | 27,198 |
Provision related to current period sales |  |  | 35,067 |  |  |  | 126,903 |  |  |  | 1,480 |  |  |  | 15,081 |  |  |  | 178,531 |
Provision related to prior period sales |  |  | (323 | ) |  |  | (682 | ) |  |  | — |  |  |  | (70 | ) |  |  | (1,075 | )
Credits/payments made for current period sales |  |  | (23,087 | ) |  |  | (96,181 | ) |  |  | (344 | ) |  |  | (12,773 | ) |  |  | (132,385 | )
Credits/payments made for prior period sales |  |  | (3,365 | ) |  |  | (18,891 | ) |  |  | (108 | ) |  |  | (1,812 | ) |  |  | (24,176 | )
Balance as of December 31, 2017 |  |  | 12,035 |  |  |  | 32,064 |  |  |  | 1,887 |  |  |  | 2,107 |  |  |  | 48,093 |
Provision related to current period sales |  |  | 46,002 |  |  |  | 190,329 |  |  |  | 1,211 |  |  |  | 20,732 |  |  |  | 258,274 |
Provision related to prior period sales |  |  | — |  |  |  | (1,845 | ) |  |  | — |  |  |  | (69 | ) |  |  | (1,914 | )
Credits/payments made for current period sales |  |  | (29,202 | ) |  |  | (148,857 | ) |  |  | — |  |  |  | (19,307 | ) |  |  | (197,366 | )
Credits/payments made for prior period sales |  |  | (9,340 | ) |  |  | (30,057 | ) |  |  | (150 | ) |  |  | (2,296 | ) |  |  | (41,843 | )
Balance as of December 31, 2018 |  | $ | 19,495 |  |  | $ | 41,634 |  |  | $ | 2,948 |  |  | $ | 1,167 |  |  | $ | 65,244 |

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