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STOCK-BASED COMPENSATION - (Tables) | 3 Months Ended
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Mar. 31, 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 for the three months ended March 31, 2021 and 2020 (in thousands):
| Three Months Ended March 31,
| 2021 |  | 2020
Research and development | $ | 4,252 |  |  | $ | 2,839 |
General and administrative | 3,272 |  |  | 2,781 |
Total stock-based compensation expense | $ | 7,524 |  |  | $ | 5,620 |

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