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Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
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 March 31, 2021 |  |  | As of March 31, 2021 |
Customer A |  |  | 47.4 | % |  |  | 53.6 | %
Customer B |  |  | 32.7 | % |  |  | 34.5 | %
Customer C |  |  | 19.0 | % |  |  | 11.3 | %
Total |  |  | 99.1 | % |  |  | 99.4 | %
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, 2020 |  | $ | 2,704 |  |  | $ | 3,930 |  |  | $ | 17,937 |  |  | $ | 24,571 |
Provision |  |  | 157 |  |  |  | 4,397 |  |  |  | 32,296 |  |  |  | 36,850 |
Payments/credits |  |  | (105 | ) |  |  | (4,566 | ) |  |  | (35,861 | ) |  |  | (40,532 | )
Balance at March 31, 2021 |  | $ | 2,756 |  |  | $ | 3,761 |  |  | $ | 14,372 |  |  | $ | 20,889 |
Common Stock Equivalents Excluded From Computation of Net Loss Per Share | Because we have incurred a net loss for both 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):
|  | March 31, |
|  | 2021 |  |  | 2020 |
Stock options outstanding |  |  | 18,795 |  |  |  | 16,510 |
Restricted stock units outstanding |  |  | 570 |  |  |  | — |
Warrants outstanding |  |  | 220 |  |  |  | 220 |
Shares of common stock underlying Convertible Notes outstanding |  |  | 9,653 |  |  |  | 9,095 |

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