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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2018
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 nine months ended September 30, 2018 and 2017:
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 |  |  | 30,814 |  |  |  | 128,905 |  |  |  | 812 |  |  |  | 14,636 |  |  |  | 175,167 |
Provision related to prior period sales |  |  | (660 | ) |  |  | (836 | ) |  |  | — |  |  |  | (69 | ) |  |  | (1,565 | )
Credits/payments made for current period sales |  |  | (15,908 | ) |  |  | (76,015 | ) |  |  | — |  |  |  | (15,038 | ) |  |  | (106,961 | )
Credits/payments made for prior period sales |  |  | (11,657 | ) |  |  | (29,594 | ) |  |  | (69 | ) |  |  | (2,297 | ) |  |  | (43,617 | )
Balance as of September 30, 2018 |  | $ | 14,624 |  |  | $ | 54,524 |  |  | $ | 2,630 |  |  | $ | (661 | ) |  | $ | 71,117 |
In thousands |  | Trade Allowances |  |  | Rebates, Chargebacks and Discounts |  |  | Product Returns |  |  | Other Incentives |  |  | Total |
Balance as of December 31, 2016 |  | $ | 3,743 |  |  | $ | 20,915 |  |  | $ | 859 |  |  | $ | 1,681 |  |  | $ | 27,198 |
Provision related to current period sales |  |  | 24,780 |  |  |  | 87,499 |  |  |  | 1,496 |  |  |  | 10,796 |  |  |  | 124,571 |
Provision related to prior period sales |  |  | (297 | ) |  |  | (841 | ) |  |  | — |  |  |  | (82 | ) |  |  | (1,220 | )
Credits/payments made for current period sales |  |  | (11,061 | ) |  |  | (62,014 | ) |  |  | (391 | ) |  |  | (8,834 | ) |  |  | (82,300 | )
Credits/payments made for prior period sales |  |  | (3,107 | ) |  |  | (16,722 | ) |  |  | (24 | ) |  |  | (1,770 | ) |  |  | (21,623 | )
Balance as of September 30, 2017 |  | $ | 14,058 |  |  | $ | 28,837 |  |  | $ | 1,940 |  |  | $ | 1,791 |  |  | $ | 46,626 |

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