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Accrued Expenses and Other Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2021
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses and Other Liabilities | Accrued expenses and other liabilities consisted of the following (in thousands):
| September 30, 2021 |  | December 31, 2020
Compensation and benefits | $ | 8,798 |  |  | $ | 8,732 |
Research and development costs | 16,457 |  |  | 15,343 |
UCLB milestone and option | — |  |  | 205 |
Professional fees | 3,060 |  |  | 3,005 |
U.S. corporate income and local taxes | 7 |  |  | — |
Other liabilities | 312 |  |  | 496 |
Total accrued expenses and other liabilities | $ | 28,634 |  |  | $ | 27,781 |

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