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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
May 31, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]                  
Interest expense       $ 3,281,088 $ 3,191,152 $ 9,505,244 $ 9,818,767    
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       47,000   86,000      
Total unamortized deferred costs       $ 105,000   $ 105,000   $ 115,000  
Number of shares redeemed   1,000 1,000            
Number of shares redeemed, value               $ 2,000,000  
Preferred stock shares outstanding (in shares)       30,700   30,700   30,700