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Accrued Expenses and Other Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2020
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses and Other Liabilities | Accrued expenses and other liabilities consisted of the following (in thousands):
| September 30, 2020 |  | December 31, 2019
Compensation and benefits | $ | 5,937 |  |  | $ | 6,568 |
Research and development costs | 13,073 |  |  | 10,449 |
UCLB milestone and option | 840 |  |  | 663 |
Professional fees | 5,148 |  |  | 2,611 |
U.S. corporate income and local taxes | — |  |  | 391 |
Other liabilities | 402 |  |  | 716 |
Total accrued expenses and other liabilities | $ | 25,400 |  |  | $ | 21,398 |

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