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Accrued Expenses and Other Current Liabilities | 12 Months Ended
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Dec. 31, 2017
Payables And Accruals [Abstract] |
Accrued Expenses and Other Current Liabilities | 5. Accrued Expenses and Other Current Liabilities 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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- Definition The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as current at the end of the reporting period. + References No definition available. + Details
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