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Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Accounting Policies [Abstract] |
Percentage of Net Product Sales and Accounts Receivable Balance | The following table includes the percentage of net product sales and accounts receivable balances for our three major Customers, each of which comprised 10% or more of our net product sales:
|  | Net Product Sales |  |  | Accounts Receivable |
|  | Three Months Ended June 30, 2019 |  |  | Six Months Ended June 30, 2019 |  |  | As of June 30, 2019 |
Customer A |  |  | 41.3 | % |  |  | 41.0 | % |  |  | 42.0 | %
Customer B |  |  | 40.4 | % |  |  | 38.7 | % |  |  | 48.0 | %
Customer C |  |  | 15.8 | % |  |  | 17.9 | % |  |  | 8.9 | %
Total |  |  | 97.5 | % |  |  | 97.6 | % |  |  | 98.9 | %
Summary of Activity to Product Returns, Distributor Fees and Discounts, Rebates and Administrative Fees | The following table provides a summary of activity with respect to our product returns, distributor fees and discounts, rebates and administrative fees, which are included in other accrued liabilities on the condensed consolidated balance sheets (in thousands):
|  | Product Returns |  |  | Distributor Fees |  |  | Discounts, Rebates and Administrative Fees |  |  | Total |
Balance at December 31, 2018 |  | $ | 947 |  |  | $ | 2,813 |  |  | $ | 21,743 |  |  | $ | 25,503 |
Provision |  |  | 707 |  |  |  | 8,434 |  |  |  | 66,334 |  |  |  | 75,475 |
Payments/credits |  |  | (41 | ) |  |  | (7,225 | ) |  |  | (54,087 | ) |  |  | (61,353 | )
Balance at June 30, 2019 |  | $ | 1,613 |  |  | $ | 4,022 |  |  | $ | 33,990 |  |  | $ | 39,625 |
Common Stock Equivalents Excluded From Computation of Net Loss Per Share | Because we have incurred a net loss for each of the periods presented in the unaudited condensed consolidated statements of operations and comprehensive loss, the following common stock equivalents were not included in the computation of net loss per share because their effect would be anti-dilutive (in thousands):
|  | June 30, |
|  | 2019 |  |  | 2018 |
Stock options outstanding |  |  | 13,545 |  |  |  | 12,514 |
Warrants outstanding |  |  | 640 |  |  |  | 640 |
Shares of common stock underlying Convertible Notes outstanding |  |  | 8,729 |  |  |  | 8,224 |

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