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Accrued Expenses and Other Current Liabilities (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Dec. 31, 2016
Payables and Accruals [Abstract] |  |
Schedule of Accrued Expenses and Other Current Liabilities | Accrued expenses and other current liabilities consist of the following (in thousands):
|  | June 30, 2017 |  |  | December 31, 2016 |
Clinical trial costs |  | $ | 899 |  |  | $ | 3,088 |
Professional fees |  |  | 660 |  |  |  | 229 |
Compensation and related benefits |  |  | 976 |  |  |  | 975 |
Interest expense |  |  | 99 |  |  |  | — |
Accrued expenses and other current liabilities |  | $ | 2,634 |  |  | $ | 4,292 |
| Accrued expenses and other current liabilities consist of the following (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Clinical development expense |  | $ | 3,088 |  |  | $ | 3,294 |
Professional fees |  |  | 229 |  |  |  | 435 |
Compensation and related benefits |  |  | 975 |  |  |  | 1,535 |
Interest expense |  |  | — |  |  |  | 28 |
Accrued expenses and other current liabilities |  | $ | 4,292 |  |  | $ | 5,292 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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