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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Prepaid insurance | $ 175 | $ 328
Other prepaid expenses | 618 | 334
Deposits and other current assets | 138 | 125
Total prepaid expenses and other current assets | 1,658 | 837
Surface Pharmaceuticals Inc [Member] |  |
Receivable due from related party | 50 | 50
Melt Pharmaceuticals, Inc. [Member] |  |
Receivable due from related party | $ 677 |

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