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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
May 31, 2017
Mar. 31, 2017
Aug. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]                          
Interest expense             $ 3,147,179 $ 3,311,421 $ 6,224,156 $ 6,627,617      
Preferred stock extend redemption date                   Aug. 01, 2018      
Preferred stock redemption extension fee paid                   $ 153,500      
Preferred stock redemption extension additional fee paid $ 153,500                        
Redeemable Convertible Preferred Stock Series B [Member]                          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]                          
Preferred stock shares issued (in shares)             30,700   30,700   30,700   35,000
Preferred stock, par or stated value (in dollars per share)             $ 0.01   $ 0.01   $ 0.01    
Liquidation preference per share (in dollars per share)             $ 1,000   $ 1,000   $ 1,000    
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested             14.00%   14.00%        
Deferred financing costs             $ 3,100,000   $ 3,100,000        
Interest expense             19,000 $ 254,000          
Total unamortized deferred stock costs             $ 77,000   $ 77,000   $ 115,000    
Number of shares redeemed   1,000 1,000 1,000 1,000 300              
Number of shares redeemed, value                     $ 2,000,000 $ 2,300,000  
Preferred stock shares outstanding (in shares)             30,700   30,700   30,700