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Accrued Expenses and Other Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Payables and Accruals [Abstract] |
Schedule of Accrued Liabilities | Accrued expenses and other liabilities consisted of the following (in thousands):
|  | December 31,
|  | 2019 |  | 2018
Compensation and benefits |  | $ | 6,568 |  |  | $ | 3,296 |
Research and development costs |  | 10,449 |  |  | 9,362 |
UCLB milestone |  | 663 |  |  | 638 |
Professional fees |  | 2,611 |  |  | 4,130 |
Deferred rent |  | 0 |  |  | 561 |
Corporate tax |  | 391 |  |  | 620 |
Other liabilities |  | 716 |  |  | 447 |
Total accrued expenses and other liabilities |  | $ | 21,398 |  |  | $ | 19,054 |

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