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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Interest expense $ 3,388,602 $ 2,379,592  
Scheduled payments due in 2017 16,600,000    
Scheduled payments due in 2018 $ 18,400,000    
Redeemable Convertible Preferred Stock Series B      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Preferred stock shares issued (in shares) 35,000   35,000
Preferred stock, par or stated value (in dollars per share) $ 0.01   $ 0.01
Liquidation preference per share (in dollars per share) $ 1,000   $ 1,000
Deferred financing costs $ 3,100,000    
Interest expense $ 254,000 $ 230,000  
Redeemable Convertible Preferred Stock Series B | 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%