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12.5% Senior Secured Notes due 2017 - Additional Information (Details) - 12.5% Senior Secured Notes due 2017 - USD ($)
3 Months Ended 9 Months Ended
May 08, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Feb. 07, 2012
Debt Instrument [Line Items]          
Notes issued principal amount         $ 275,000,000
Issue price percentage of principal amount         97.00%
Senior secured notes, maturity date     Apr. 15, 2017    
Debt instrument, event of default description     On April 17, 2017 (being the payment date following the Saturday, April 15, 2017 maturity date).    
Notes outstanding   $ 249,900,000 $ 249,900,000    
Interest rate on Senior secured notes   12.50% 12.50% 12.50%  
Additional interest rate     2.00%    
New York          
Debt Instrument [Line Items]          
Repayments of debt   $ 10,400,000      
Minimum          
Debt Instrument [Line Items]          
Secured leverage ratio     4.75%    
Maximum          
Debt Instrument [Line Items]          
Secured leverage ratio     4.75%    
Forbearance Agreement          
Debt Instrument [Line Items]          
Frequency of interest payment     monthly    
Debt instrument, periodic payment, interest $ 2,864,583        
Debt instrument payment period     As part of the Forbearance Agreement, the Company agreed to make monthly interest payments of $2,864,583 on the Notes for the 30 day periods ending on May 15, 2017 and June 15, 2017, rather than on a semi-annual basis as required by the Indenture.    
Percentage of principal amount agreed to pay as consent fee 0.35%        
Forbearance Agreement | Minimum          
Debt Instrument [Line Items]          
Percentage of outstanding senior notes holders agreed to forbear from exercising rights 75.00%