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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 11, 2015
Mar. 09, 2015
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
May. 10, 2012
Gain Contingencies [Line Items]              
Minimum bid price   $ 1.00          
Number of consecutive business days not complied with minimum bid price   30 days          
Number of days afforded to regain compliance with minimum bid price requirement   180 days          
Cash and cash equivalents     $ 1,840,401 $ 3,143,550 $ 3,711,573 $ 21,322,257  
Working capital deficit     36,300,000        
Bank loan amount     11,800,000        
Face amount of debt financed             $ 8,000,000
Total assets     $ 20,561,993 $ 25,089,539      
Bank loan maturity period     2015        
Minosa [Member]              
Gain Contingencies [Line Items]              
Amount of debt financed $ 14,750,000   $ 14,750,000        
Maturity date     Dec. 31, 2015        
Monaco Notes [Member]              
Gain Contingencies [Line Items]              
Face amount of debt financed     $ 10,000,000        
Debt instrument, latest maturity date     Dec. 31, 2016        
Penelope Mining LLC [Member]              
Gain Contingencies [Line Items]              
Investment in convertible preferred stock $ 101,000,000            
Investment agreement period 3 years