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Stock-Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Based Compensation Expense Recognized in Accompanying Condensed Consolidated Statements of Operations | Total stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 was as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
RSUs and options |  | $ | 1,826 |  |  | $ | 1,066 |
Employee stock purchase plan |  |  | 109 |  |  |  | 62 |
Total stock compensation expense |  | $ | 1,935 |  |  | $ | 1,128 |

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