Quarterly report pursuant to Section 13 or 15(d)

Equity and Mezzanine Equity - Additional Information (Details)

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Equity and Mezzanine Equity - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 28, 2018
Dec. 31, 2017
Jun. 15, 2016
Jun. 04, 2015
Apr. 29, 2014
Equity [Line Items]                    
Convertible Preferred Stock, Terms of Conversion       P20D            
Preferred Stock, Redemption Price Per Share   $ 25.00   $ 25.00            
Dividends payable   $ 3,037,000   $ 3,037,000     $ 5,480,000      
Common Stock                    
Equity [Line Items]                    
Issuance of common stock under Share Incentive Plan, shares       168,217            
Preferred Stock                    
Equity [Line Items]                    
Dividends payable   $ 3,040,000   $ 3,040,000            
2015 Share Incentive Plan                    
Equity [Line Items]                    
Maximum number of shares authorized under Share Incentive Plan (in shares)                 125,000  
Issuance of common stock under Share Incentive Plan, shares       0            
Shares available for issuance under Share Incentive Plan (in shares)   41,104   41,104            
2016 Share Incentive Plan                    
Equity [Line Items]                    
Maximum number of shares authorized under Share Incentive Plan (in shares)               625,000    
Issuance of common stock under Share Incentive Plan, shares       168,217            
Value of stock issued Share Incentive Plan       $ 894,000            
Shares available for issuance under Share Incentive Plan (in shares)   352,655   352,655            
Series D Preferred Stock                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares)   3,600,636   3,600,636     2,237,000      
Temporary Equity, Accretion to Redemption Value   $ 148,000 $ 184,000 $ 444,000 $ 540,000          
Series A Preferred Stock                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares)   562   562     562      
Preferred stock, liquidation price per share (in dollars per share)   $ 1,000   $ 1,000     $ 1,000      
Preferred Stock, Liquidation Preference, Value   $ 562,000   $ 562,000     $ 562,000      
Preferred stock shares issued (in shares)   562   562     562      
Preferred stock, shares authorized (in shares)   4,500   4,500     4,500      
Series B Convertible Preferred Stock                    
Equity [Line Items]                    
Preferred stock, liquidation price per share (in dollars per share)   $ 25.00   $ 25.00            
Preferred Stock, Liquidation Preference, Value   $ 46,900,000.00   $ 46,900,000.00            
Preferred Stock, Dividend Rate, Percentage       9.00%            
Preferred stock shares issued (in shares)   1,875,748   1,875,748     1,875,848      
Preferred stock, shares authorized (in shares)   5,000,000   5,000,000            
Preferred Stock Adjusted Conversion Price Per Share   $ 58   $ 58            
Preferred Stock, Redemption Price Per Share   $ 40.00   $ 40.00            
Series D Preferred Stock                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares)   3,600,636   3,600,636            
Preferred stock, liquidation price per share (in dollars per share)   $ 25.00   $ 25.00   $ 25.00        
Preferred Stock, Liquidation Preference, Value   $ 90,020,000.00   $ 90,020,000.00     $ 55,930,000.00      
Preferred Stock, Dividend Rate, Percentage       8.75%            
Preferred stock shares issued (in shares)   3,600,636   3,600,636     2,237,000      
Preferred stock, shares authorized (in shares)   4,000,000   4,000,000            
Preferred Stock, Initial Liquidation Preference Per Share   $ 2.1875   $ 2.1875            
Preferred Stock, Dividend Over Initial Rate, Percentage       2.00%            
Convertible Preferred Stock Conversion Price       $ 16.96            
Redeemable Preferred Stock                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares)   562   562            
Common Stock                    
Equity [Line Items]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   1,986,600
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right                   0.125
Class of Warrant or Right, Exercise Price of Warrants or Rights                   $ 44
Line of Credit                    
Equity [Line Items]                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   750,000   750,000            
Maximum | Series D Preferred Stock                    
Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage       14.00%            
Equity Distribution Agreement | Series A Preferred Stock | Preferred Stock                    
Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage       9.00%            
Conversion Price Percentage       103.00%            
Public Offering [Member] | Series D Preferred Stock                    
Equity [Line Items]                    
Sale of Stock, Number of Shares Issued in Transaction 1,363,636                  
Sale of Stock, Price Per Share $ 16.50                  
Sale of Stock, Consideration Received on Transaction $ 21,160,000.00