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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 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 |
|  | Year Ended December 31, 2021 |  |  | As of December 31, 2021 |
Customer A |  |  | 44.7 | % |  |  | 50.2 | %
Customer B |  |  | 34.9 | % |  |  | 33.8 | %
Customer C |  |  | 19.2 | % |  |  | 15.3 | %
Total |  |  | 98.8 | % |  |  | 99.3 | %
Common Stock Equivalents Excluded From Computation of Net Loss Per Share | Because we have incurred a net loss for all periods presented in the 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):
|  | December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Stock options outstanding |  |  | 18,944 |  |  |  | 18,912 |  |  |  | 16,665 |
Restricted stock units outstanding |  |  | 2,803 |  |  |  | 603 |  |  |  | — |
Warrants outstanding |  |  | — |  |  |  | 220 |  |  |  | 508 |
Shares of common stock underlying convertible notes outstanding |  |  | 9,819 |  |  |  | 9,510 |  |  |  | 8,960 |

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