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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Interest expense $ 3,323,740 $ 2,630,737 $ 10,187,983 $ 7,286,351  
Scheduled payments due in 2017 14,300,000   14,300,000    
Scheduled payments due in 2018 $ 18,400,000   $ 18,400,000    
Redeemable Convertible Preferred Stock Series B [Member]          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Preferred stock shares issued (in shares) 32,700   32,700   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
Deferred financing costs $ 3,100,000   $ 3,100,000    
Interest expense 254,000 $ 241,000 508,000 $ 700,000  
Total unamortized deferred stock costs $ 845,000   $ 845,000   $ 1,600,000
Number of shares redeemed     2,300    
Number of shares redeemed, value     $ 2,300,000    
Preferred stock shares outstanding (in shares) 32,700   32,700   35,000
Redeemable Convertible Preferred Stock Series B [Member] | Minimum [Member]          
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]          
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested 14.00%   14.00%