Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Other Assets [Abstract] | ||
| Prepaid insurance premiums | $ 39 | $ 66 |
| Security deposit | 20 | |
| Other | 26 | 29 |
| Prepaid expenses and other current assets | $ 85 | $ 95 |