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Accrued Expenses and Other Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2021
Payables and Accruals [Abstract] |
Schedule of Accrued Expenses and Other Liabilities | Accrued expenses and other liabilities consisted of the following (in thousands):
| March 31, 2021 |  | December 31, 2020
Compensation and benefits | $ | 8,695 |  |  | $ | 8,732 |
Research and development costs | 11,468 |  |  | 15,343 |
UCLB milestone and option | 206 |  |  | 205 |
Professional fees | 3,311 |  |  | 3,005 |
U.S. corporate income and local taxes | 429 |  |  | — |
Other liabilities | 574 |  |  | 496 |
Total accrued expenses and other liabilities | $ | 24,683 |  |  | $ | 27,781 |

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