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STOCK-BASED COMPENSATION - (Tables) | 9 Months Ended
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Sep. 30, 2020
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 and nine months ended September 30, 2020 and 2019 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Research and development | $ | 3,573 |  |  | $ | 2,268 |  |  | $ | 9,990 |  |  | $ | 7,329 |
General and administrative | 3,109 |  |  | 2,433 |  |  | 9,076 |  |  | 6,762 |
Total stock-based compensation expense | $ | 6,682 |  |  | $ | 4,701 |  |  | $ | 19,066 |  |  | $ | 14,091 |

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