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Loss Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (shares)     1,594,761 1,233,585  
Stock Appreciation Rights (SARs) [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 327,500 327,500      
Contingent Restricted Stock Units (RSUs)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from computation of earnings per share (shares) 1,308,781   1,443,921    
Series 4 Convertible Preferred Stock | Convertible Preferred Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Shares outstanding (shares) 95,000   95,000   95,000
Convertible preferred stock, shares issued upon conversion (shares) 10,544,708 9,741,680 10,544,708 9,741,680