Quarterly report pursuant to Section 13 or 15(d)

Equity and Mezzanine Equity - Additional Information (Details)

v3.19.2
Equity and Mezzanine Equity - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Dec. 31, 2018
USD ($)
director
quarter
$ / shares
shares
Apr. 29, 2019
shares
Jun. 28, 2018
$ / shares
Jun. 15, 2016
shares
Jun. 04, 2015
shares
Apr. 29, 2014
$ / shares
shares
Equity [Line Items]                    
Convertible Preferred Stock, Terms of Conversion     P20D              
Preferred Stock, Redemption Price Per Share | $ / shares $ 25.00   $ 25.00              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           248,325        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 0 0 0 0            
Series D Preferred                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares) 3,600,636   3,600,636   3,600,636          
Series A Preferred                    
Equity [Line Items]                    
Preferred stock, shares outstanding (in shares) 562   562   562          
Preferred stock, shares authorized (in shares) 4,500   4,500   4,500          
Preferred stock, liquidation price per share (in dollars per share) | $ / shares $ 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          
Series B Convertible Preferred Stock                    
Equity [Line Items]                    
Preferred stock, shares authorized (in shares) 5,000,000   5,000,000              
Preferred stock, liquidation price per share (in dollars per share) | $ / shares $ 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              
Preferred Stock Adjusted Conversion Price Per Share | $ / shares $ 58   $ 58              
Preferred Stock, Redemption Price Per Share | $ / shares $ 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, shares authorized (in shares) 4,000,000   4,000,000              
Preferred stock, liquidation price per share (in dollars per share) | $ / shares $ 25.00   $ 25.00   $ 25.00   $ 25.00      
Preferred Stock, Liquidation Preference, Value | $ $ 96,820,000.00   $ 96,820,000.00   $ 91,980,000.00          
Preferred Stock, Dividend Rate, Percentage     10.75%   8.75%          
Preferred stock shares issued (in shares) 3,600,636   3,600,636              
Preferred Stock, Initial Liquidation Preference Per Share | $ / shares $ 2.1875   $ 2.1875              
Preferred Stock, Dividend Over Initial Rate, Percentage     2.00%   2.00%          
Convertible Preferred Stock Conversion Price | $ / shares     $ 16.96              
Number of business days to increase dividend rate after failure to pay any dividend         3          
Preferred Stock, Liquidation Preference Per Share Per Annum | $ / shares         $ 0.50          
Preferred Stock, Minimum Consecutive Quarterly Periods for Dividends in Arrears | quarter         6          
Number of Additional Directors | director         2          
Preferred Stock, Percentage of Holders of Shares Outstanding         20.00%          
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 | $ / shares                   $ 44
Common Stock | 2015 Share Incentive Plan                    
Equity [Line Items]                    
Maximum number of shares authorized under Share Incentive Plan (in shares)                 125,000  
Shares available for issuance under Share Incentive Plan (in shares) 41,104   41,104              
Common Stock | 2016 Share Incentive Plan                    
Equity [Line Items]                    
Maximum number of shares authorized under Share Incentive Plan (in shares)               625,000    
Shares available for issuance under Share Incentive Plan (in shares) 132,707   132,707              
Maximum | Series D Preferred Stock                    
Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage     14.00%              
Equity Distribution Agreement | Series A Preferred | Preferred Stock                    
Equity [Line Items]                    
Preferred Stock, Dividend Rate, Percentage     9.00%              
Conversion Price Percentage     103.00%