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ACCRUED EXPENSES (Tables) | 9 Months Ended
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Sep. 30, 2021
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses | The following table sets forth the composition of accrued expenses as of September 30, 2021 and December 31, 2020 (in thousands):
| September 30, 2021 |  | December 31, 2020
Research and development | $ | 2,148 |  |  | $ | 1,372 |
Payroll-related expenses | 1,628 |  |  | 1,892 |
Professional fees | 2,089 |  |  | 684 |
Restructuring charge related | 2,237 |  |  | — |
Other | 84 |  |  | 25 |
Total Accrued Expenses | $ | 8,186 |  |  | $ | 3,973 |

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