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Accrued Expenses and Other Current Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Payables And Accruals [Abstract] |
Schedule of Accrued Expenses and Other Current Liabilities | Accrued expenses and other current liabilities consisted of the following:
|  | December 31, |
|  | 2020 |  |  | 2019 |
External research and development |  | $ | 5,099 |  |  | $ | 3,077 |
Professional services |  |  | 464 |  |  |  | 336 |
Other |  |  | 197 |  |  |  | 333 |
Total accrued expenses and other current liabilities |  | $ | 5,760 |  |  | $ | 3,746 |

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