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Accrued Expenses and Other Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2018
Other Liabilities Disclosure [Abstract] |
Schedule of Accrued Expenses and Other Liabilities | Accrued expenses and other liabilities consisted of the following (in thousands):
| June 30, 2018 |  | December 31, 2017
Accrued compensation costs | $ | 188 |  |  | $ | 129 |
Other accrued expenses | 134 |  |  | 257 |
Accrued dividends | 65 |  |  | 59 |
Deferred revenue | 60 |  |  | 393 |
Super G Warrant liability | — |  |  | 165 |
Accrued expenses and other liabilities | $ | 447 |  |  | $ | 1,003 |

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