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Significant Accounting Policies (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Aug. 14, 2019
USD ($)
shares
Aug. 01, 2019
USD ($)
$ / shares
shares
Jul. 01, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Property
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Jan. 01, 2019
USD ($)
Significant Account Policies [Line Items]              
Cash equivalents         $ 5,100,000 $ 5,800,000  
Restricted cash         $ 6,600,000 $ 4,000,000  
Number of real estate properties held for sale | Property         4    
Asset impairment charge         $ 0    
Preferred stock dividend rate percentage         14.00%    
Preferred stock shares outstanding (in shares) | shares         16,000 16,900  
Right-of-use assets         $ 661,000    
Lease liabilities         613,074    
Lease liabilities, gross         661,000    
Accounting Standards Update 2016-02 [Member]              
Significant Account Policies [Line Items]              
Right-of-use assets         147,000   $ 514,000
Lease liabilities         $ 147,000   $ 514,000
Redeemable Convertible Preferred Stock Series B [Member]              
Significant Account Policies [Line Items]              
Number of shares redeemed | shares         900 13,800  
Redeemable preferred stock         $ 16,000,000 $ 16,900,000  
Preferred stock liquidation preference value (in dollars per share) | $ / shares         $ 1,000 $ 1,000  
Number of shares redeemed         $ 900,000 $ 13,800,000  
Preferred stock shares outstanding (in shares) | shares         16,000 16,900  
Subsequent Event [Member] | Redeemable Convertible Preferred Stock Series B [Member]              
Significant Account Policies [Line Items]              
Number of shares redeemed | shares 2,000 16,000          
Redeemable preferred stock   $ 16,000,000          
Preferred stock dividend rate percentage   24.00%          
Preferred stock liquidation preference value (in dollars per share) | $ / shares   $ 1,000          
Number of shares redeemed $ 2,000,000            
Preferred stock shares outstanding (in shares) | shares 14,000            
Genesis Plaza [Member] | Subsequent Event [Member]              
Significant Account Policies [Line Items]              
Sale of Interest in property     43.00%        
Sale of Property     $ 5,600,000        
Sale of real estate property, debt assumed     2,900,000        
Proceeds from sale of property     $ 2,900,000        
The Presidio [Member] | Subsequent Event [Member]              
Significant Account Policies [Line Items]              
Proceeds from sale of property       $ 12,300,000      
Gain recognized on sale of property       $ 4,500,000