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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 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 |  |  | 6,418 |  |  |  | 1,071 |  |  |  | 7,489 |
Credit or payments made during the period |  |  | (4,698 | ) |  |  | (217 | ) |  |  | (4,915 | )
Balance at June 30, 2019 |  | $ | 3,456 |  |  | $ | 1,423 |  |  | $ | 4,879 |

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