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STOCK-BASED COMPENSATION - (Tables) | 6 Months Ended
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Jun. 30, 2021
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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | $ | 5,458 |  |  | $ | 3,578 |  |  | $ | 9,710 |  |  | $ | 6,417 |
General and administrative | 4,025 |  |  | 3,186 |  |  | 7,297 |  |  | 5,967 |
Total stock-based compensation expense | $ | 9,483 |  |  | $ | 6,764 |  |  | $ | 17,007 |  |  | $ | 12,384 |

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