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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 |  |  |  |  |  |

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