Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Accrued Liabilities (Details)

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Stockholders' Equity - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued dividends payable $ 650 $ 611
Series A Preferred Stock [Member]    
Accrued dividends payable 385 354
Series A-1 Preferred Stock [Member]    
Accrued dividends payable $ 265 $ 257