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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
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 year ended December 31, 2018 (in thousands):
|  | Chargebacks, discounts and other fees |  |  | Returns |  |  | Total |
Balance at December 31, 2017 |  | $ | - |  |  | $ | - |  |  | $ | - |
Provision related to current period sales |  |  | 4,012 |  |  |  | 570 |  |  |  | 4,582 |
Credit or payments made during the period |  |  | (2,276 | ) |  |  | (1 | ) |  |  | (2,277 | )
Balance at December 31, 2018 |  | $ | 1,736 |  |  | $ | 569 |  |  | $ | 2,305 |

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