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Summary of Significant Accounting Policies (Share-Based Compensation) (Tables) | 12 Months Ended
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Dec. 31, 2020
Canceled/expired |
Stock-based employee compensation expense (Tables) | The following table summarizes the amount of share-based compensation expense by line item on the Statement of Operations (in thousands):
|  |  | Year Ended December 31,
|  |  | 2020 |  |  | 2019
Cost of product revenue |  | $ | - |  | $ | 26
Research and development expense |  |  | 699 |  |  | 379
Sales, marketing, general and administrative expense |  |  | 598 |  |  | 1,209
|  | $ | 1,297 |  | $ | 1,614

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