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Accrued Expenses and Other Current Liabilities (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Payables and Accruals [Abstract] |  |
Schedule of accrued expenses and other current liabilities | Accrued expenses and other current liabilities consist of the following as of June 30, 2018 and December 31, 2017 (in thousands):
| As of June 30, |  | As of December 31,
| 2018 |  | 2017
Compensation and related benefits, including severance | $ | 1,571 |  |  | $ | 2,215 |
Development, site costs and contract manufacturing | 675 |  |  | 519 |
Legal, audit and tax services | 1,104 |  |  | 1,542 |
Consulting | 59 |  |  | 160 |
Other accrued expenses and other current liabilities | 581 |  |  | 1,126 |
| $ | 3,990 |  |  | $ | 5,562 |
| Accrued expenses and other current liabilities consist of the following as of December 31, 2017 and 2016 (in thousands):
| December 31, 2017 |  | December 31, 2016
Compensation and related benefits | $ | 2,215 |  |  | $ | 5,869 |
Development, site costs, and contract manufacturing | 519 |  |  | 524 |
Legal, audit and tax services | 1,542 |  |  | 1,280 |
Consulting | 160 |  |  | 888 |
Deferred rent | 334 |  |  | 309 |
Other accrued expenses and other current liabilities | 792 |  |  | 2,156 |
| $ | 5,562 |  |  | $ | 11,026 |

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