Annual report pursuant to Section 13 and 15(d)

Equity and Mezzanine Equity - Additional Information (Details)

v3.10.0.1
Equity and Mezzanine Equity - Additional Information (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
shares
Jan. 31, 2018
shares
Dec. 31, 2016
shares
Dec. 31, 2018
USD ($)
director
holder
quarter
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Jun. 28, 2018
$ / shares
Mar. 31, 2018
$ / shares
Mar. 30, 2017
shares
Dec. 01, 2016
$ / shares
shares
Sep. 30, 2016
$ / shares
shares
Jul. 07, 2016
USD ($)
Jun. 30, 2016
shares
Jun. 15, 2016
shares
Apr. 08, 2016
$ / shares
shares
Dec. 31, 2015
shares
Jun. 30, 2015
shares
Jun. 04, 2015
shares
Apr. 29, 2014
$ / shares
shares
Jun. 30, 2013
shares
Equity [Line Items]                                        
Common stock outstanding (in shares) 8,588,470     9,511,464 8,744,189       68,707,755                      
Reverse stock split conversion ratio 0.125                                      
Shares of common stock authorized (in shares) 18,750,000     18,750,000 18,750,000       150,000,000                      
Fractional shares issued in connection with reverse stock split (in shares) 0                                      
Authority to issue stock (in shares)       33,750,000                                
Common stock, par value (in dollars per share) | $ / shares       $ 0.01 $ 0.01                              
Ownership interest of operating partnership       98.33%                                
Units to stock conversion ratio       1                                
Common units outstanding (in shares)       13,870,680 11,226,868                              
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares       $ 1,000                                
Preferred Stock, Liquidation Preference Value | $       $ 562,000                                
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount | $                       $ 50,000,000                
Convertible Preferred Stock, Terms of Conversion       20 days                                
Preferred Stock, Redemption Price Per Share | $ / shares       $ 25.00                                
Preferred Stock, Amount of Preferred Dividends in Arrears | $       $ 3,040,000                                
Trust Owning [Member]                                        
Equity [Line Items]                                        
Common units outstanding (in shares)       14,105,712 10,591,850                              
Minimum [Member]                                        
Equity [Line Items]                                        
Shares of common stock authorized (in shares)                                 9,375,000      
Minimum [Member] | Exchange of Stock for Stock [Member]                                        
Equity [Line Items]                                        
Shares of common stock authorized (in shares)                                       1,875,000
Maximum [Member] | Exchange of Stock for Stock [Member]                                        
Equity [Line Items]                                        
Shares of common stock authorized (in shares)       18,750,000                         18,750,000     9,375,000
Preferred stock, shares authorized (in shares)       15,000,000                                
Line of Credit [Member]                                        
Equity [Line Items]                                        
Private placement transaction, common stock shares under warrants issued       750,000                     750,000          
Private placement transaction, exercise price of warrants (in usd per share) | $ / shares                             $ 0.0001          
Preferred Stock | Private Placement [Member]                                        
Equity [Line Items]                                        
Preferred stock cumulative dividend rate per annum       9.00%                                
Percentage of price at which common stock is sold in secondary offering       103.00%                                
Common Stock                                        
Equity [Line Items]                                        
Common stock outstanding (in shares)     8,503,819 9,511,464 8,744,189 8,503,819                   8,282,459        
Series D Cumulative Convertible Preferred Stock                                        
Equity [Line Items]                                        
Preferred stock, shares authorized (in shares)       4,000,000                                
Preferred stock shares redeemed (in shares)       3,600,636 2,237,000                              
Cumulative Convertible Preferred Stock, Shares Issued (in shares)       3,600,636 2,237,000                              
Temporary Equity, Liquidation Preference | $       $ 91,980,000 $ 55,930,000                              
Shares of convertible preferred stock authorized (in shares)       4,000,000 4,000,000                              
Series D Cumulative Convertible Preferred Stock | Public Offering [Member]                                        
Equity [Line Items]                                        
Sale of Stock, Number of Shares Issued in Transaction   1,363,636                                    
Series D Preferred Stock                                        
Equity [Line Items]                                        
Preferred Stock, Shares Issued     2,237,000     2,237,000       637,000 1,600,000                  
Preferred stock outstanding (in shares)     2,237,000 3,600,636 2,237,000 2,237,000                            
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares       $ 25.00     $ 25.00                          
Preferred Stock, Redemption Price Per Share | $ / shares       $ 25.00                                
Proceeds from issuance of Series B convertible preferred stock | $       $ 21,160,000   $ 52,400,000                            
Share Price | $ / shares                   $ 24.00 $ 25.00                  
Preferred Stock, Initial Liquidation Preference Per Share | $ / shares       $ 2.1875                                
Preferred Stock, Dividend Over Initial Rate, Percentage       2.00%                                
Secondary offering common stock price per share (in usd per share) | $ / shares       $ 16.96                                
Ratio of Asset Coverage to Total Debt       200.00%                                
Preferred Stock, Period To Pay Dividends After Payment Date       3 days                                
Preferred Stock, Liquidation Preference Per Share Per Annum | $ / shares       $ 0.50                                
Preferred Stock, Minimum Consecutive Quarterly Periods for Dividends in Arrears | quarter       6                                
Preferred Stock, Increase in Number or Holders of Shares | holder       2                                
Number of Additional Directors | director       2                                
Preferred Stock, Percentage of Holders of Shares Outstanding       20.00%                                
Preferred Stock Redemption Discount | $       $ 591,000 $ 723,000 $ 0                            
Preferred Stock, Amount of Preferred Dividends in Arrears | $       $ 1,970,000                                
Temporary Equity, Liquidation Preference Per Share | $ / shares       $ 25.00 $ 25.00                              
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ / shares       $ 0.55                                
Series D Preferred Stock | Public Offering [Member]                                        
Equity [Line Items]                                        
Sale of Stock, Price Per Share | $ / shares               $ 16.50                        
Series D Preferred Stock | Minimum [Member]                                        
Equity [Line Items]                                        
Preferred stock cumulative dividend rate per annum       8.75%                                
Series D Preferred Stock | Maximum [Member]                                        
Equity [Line Items]                                        
Preferred stock cumulative dividend rate per annum       14.00%                                
Redeemable Preferred Stock [Member]                                        
Equity [Line Items]                                        
Preferred stock shares redeemed (in shares)       562                                
Series B Preferred Stock                                        
Equity [Line Items]                                        
Preferred stock, shares authorized (in shares)       5,000,000 5,000,000                              
Preferred Stock, Shares Issued       1,875,748 1,875,848                              
Preferred stock outstanding (in shares)     1,871,244 1,875,748 1,875,848 1,871,244                            
Preferred Stock, Liquidation Preference Value | $       $ 46,900,000 $ 46,900,000                              
Series B Preferred Stock | Preferred Stock                                        
Equity [Line Items]                                        
Preferred stock outstanding (in shares)     1,871,244 1,875,748 1,875,848 1,871,244                   729,119        
Issuance of stocks, net of expenses (in shares)         4,604 1,142,225                            
Series A Preferred Stock                                        
Equity [Line Items]                                        
Preferred stock, shares authorized (in shares)       4,500 4,500                              
Preferred Stock, Shares Issued       562 562                              
Preferred stock outstanding (in shares)       562 562                              
Preferred Stock, Amount of Preferred Dividends in Arrears | $       $ 13,000                                
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ / shares       $ 22.50                                
Series A Preferred Stock | Preferred Stock                                        
Equity [Line Items]                                        
Preferred stock outstanding (in shares)     562 562 562 562                   562        
Common Stock                                        
Equity [Line Items]                                        
Private placement transaction, common stock shares under warrants issued                                     1,986,600  
Warrants issued                                     0.125  
Private placement transaction, exercise price of warrants (in usd per share) | $ / shares                                     $ 44  
Common Stock | 2015 Incentive Plan                                        
Equity [Line Items]                                        
Number of shares authorized under Share Incentive Plan                                   125,000    
Shares available for issuance under the Company’s Share Incentive Plan (in shares)       41,104                                
Common Stock | 2016 Incentive Plan                                        
Equity [Line Items]                                        
Number of shares authorized under Share Incentive Plan                           625,000            
Shares available for issuance under the Company’s Share Incentive Plan (in shares)       314,514                                
Series B Convertible Preferred Stock [Member]                                        
Equity [Line Items]                                        
Preferred stock, shares authorized (in shares)       5,000,000                                
Preferred Stock, Shares Issued                         729,119              
Preferred stock outstanding (in shares)       1,875,748 1,875,848                              
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares       $ 25.00                                
Preferred Stock, Liquidation Preference Value | $       $ 46,900,000                                
Preferred stock cumulative dividend rate per annum       9.00%                                
Issuance of stocks, net of expenses (in shares)     1,142,225   4,604                              
Adjusted conversion price of preferred to common (in usd per share) | $ / shares       $ 58                                
Preferred Stock, Redemption Price Per Share | $ / shares       $ 40.00                                
Proceeds from issuance of Series B convertible preferred stock | $         $ 96,000 $ 23,400,000                            
Preferred Stock, Amount of Preferred Dividends in Arrears | $       $ 1,060,000                                
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears | $ / shares       $ 0.56                                
Series B Convertible Preferred Stock [Member] | Private Placement [Member]                                        
Equity [Line Items]                                        
Issuance of stocks, net of expenses (in shares)       1,146,829