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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable, net of allowance of $101 and $94, respectively $ 101 $ 94
Common stock, $0.01 par value, 200,000,000 shares authorized, 32,511,660 and 32,120,210 shares issued and outstanding at December 31, 2018 and 2017, respectively $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 32,511,660 32,120,210
Common stock, shares outstanding (in shares) 32,511,660 32,120,210
Convertible preferred stock, shares outstanding (in shares) 4,833,000 4,790,000
Series B Convertible Preferred Stock    
5.50% Series B cumulative convertible preferred stock, $0.01 par value, 4,965,850 shares issued and outstanding at December 31, 2018 and 2017 $ 0.01 $ 0.01
Convertible preferred stock, shares issued (in shares) 4,965,850 4,965,850
Convertible preferred stock, shares outstanding (in shares) 4,965,850 4,965,850
Preferred stock dividend rate 5.50% 5.50%
Series D Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock authorized (in shares) 50,000,000 50,000,000
Preferred stock issued (in shares) 1,600,000 0
Preferred stock outstanding (in shares) 1,600,000 0