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STOCK-BASED COMPENSATION - (Tables) | 3 Months Ended
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Mar. 31, 2022
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation Expense | The following table shows total stock-based compensation expense included in the Condensed Consolidated Statements of Operations (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Research and development |  |  |  |  | $ | 4,670 |  |  | $ | 4,252 |
General and administrative |  |  |  |  | 3,021 |  |  | 3,272 |
Total stock-based compensation expense |  |  |  |  | $ | 7,691 |  |  | $ | 7,524 |

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