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Accrued Expenses and Other Current Liabilities (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Payables and Accruals [Abstract] |  |
Schedule of Accrued Expenses and Other Current Liabilities |
| March 31, 2018 |  |  | December 31, 2017 |
Accrued external research and development expenses |  | $ | 2,567 |  |  | $ | 1,770 |
Accrued payroll and related expenses |  |  | 600 |  |  |  | 1,369 |
Accrued professional fees |  |  | 824 |  |  |  | 878 |
Accrued other |  |  | 493 |  |  |  | 304 |
|  | $ | 4,484 |  |  | $ | 4,321 |
| Accrued expenses and other current liabilities consisted of the following (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Accrued external research and development expenses |  | $ | 1,770 |  |  | $ | 627 |
Accrued payroll and related expenses |  |  | 1,369 |  |  |  | 1,018 |
Accrued professional fees |  |  | 878 |  |  |  | 1,062 |
Accrued other |  |  | 304 |  |  |  | 221 |
|  | $ | 4,321 |  |  | $ | 2,928 |

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