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Accrued and Other Current Liabilities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Accrued and Other Current Liabilities |
Schedule of accrued and other current liabilities |
|  |  | December 31, |
|  |  | 2016 |  |  | 2017 |
Accrued research and development |  |  |  | $ | 2,138 |  |  |  |  | $ | 1,645 |  |
Accrued legal and professional fees |  |  |  |  | 194 |  |  |  |  |  | 248 |  |
Other current liabilities |  |  |  |  | 430 |  |  |  |  |  | 662 |  |
|  |  |  | $ | 2,762 |  |  |  |  | $ | 2,555 |  |

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