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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue Recognition [Abstract] |
Summary of Product Revenue Allowance and Reserve Categories | The following table summarizes balances and activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2019 (in thousands):
|  | Chargebacks, distribution fees, discounts and other fees |  |  | Returns |  |  | Total |
Balance at December 31, 2018 |  | $ | 1,736 |  |  | $ | 569 |  |  | $ | 2,305 |
Provision related to current period sales |  |  | 3,080 |  |  |  | 458 |  |  |  | 3,538 |
Credit or payments made during the period |  |  | (1,658 | ) |  |  | (86 | ) |  |  | (1,744 | )
Balance at March 31, 2019 |  | $ | 3,158 |  |  | $ | 941 |  |  | $ | 4,099 |

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