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Notes Payable (First Amendment and Waiver) - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2015
Jul. 31, 2015
Sep. 30, 2015
Aug. 31, 2015
Jul. 31, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]                
Percentage of applicable interest rate margin paid in cash   12.00%            
Percentage of applicable interest rate margin paid in kind   14.00%            
Percentage change in margin interest paid in cash   9.00%            
Credit facility, maturity date   Dec. 31, 2016            
Borrower's proved reserves             Greater than 1.5 times the net debt  
Repayment of debt by borrower $ 30,000,000              
Proceeds from sale of assets   $ 17,000,000            
Percentage of proceeds that can be used for development   50.00%            
Total fees paid to administrative agent   $ 4,000,000            
Interest and legal expense added to principal             $ 4,917,077 $ 1,818,240
Net Profits Interest Agreement [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Percentage of increase in NPI assets after sale   2.00%            
Net Profits Interest Agreement [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Percentage of increase in NPI assets after sale   11.00%            
First Amendment and Waiver [Member]                
Debt Instrument [Line Items]                
Interest and legal expense added to principal     $ 3,917,077 $ 3,917,077 $ 3,917,077 $ 1,000,000