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Stockholders' Equity (Deficit) - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 09, 2016 | Jun. 09, 2015 USD ($) shares | Mar. 31, 2015 USD ($) shares | Sep. 30, 2016 USD ($) Directors $ / shares shares | Jun. 30, 2016 Directors | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2016 USD ($) Incentive_Plan $ / shares shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split, conversion ratio | 0.50000 | 0.16666 |  |  |  |  | 0.08333 |  |
Common stock shares authorized |  |  |  | 75,000,000 |  |  | 75,000,000 |  | 75,000,000
Common stock, par value | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001
Common stock, value | $ |  |  |  | $ 760 |  |  | $ 760 |  | $ 754
Preferred stock, par value | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001
Preferred stock, shares authorized |  |  |  | 24,984,166 |  |  | 24,984,166 |  | 24,984,166
Warrants to purchase shares of common stock outstanding |  |  |  | 0 |  |  | 0 |  | 0
Number of stock incentive plans | Incentive_Plan |  |  |  |  |  |  | 2 |  |
Stock incentive plan expiration date |  |  |  |  |  |  | Aug. 31, 2015 |  |
Share-based compensation | $ |  |  |  | $ 756,145 |  | $ 504,732 | $ 1,448,646 | $ 1,898,111 |
Weighted average fair value of options granted | $ / shares |  |  |  | $ 0 |  | $ 0 |  |  |
Number of outside directors granted quarterly fees | Directors |  |  |  | 2 | 2 |  |  |  |
2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  | 450,000 |  |  |  |  |  |  |
Mako Resources, LLC [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  | 333,333 |  |  |  |  |  |
Common stock, value | $ |  |  | $ 2,520,000 |  |  |  |  |  |
Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares termination of option to acquire |  |  | 6,000,000 |  |  |  |  |  |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock outstanding |  |  |  | 130,208 |  |  | 130,208 |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  | $ 43.20 |  |
Warrants expiration date |  |  |  |  |  |  | Nov. 09, 2016 |  |
Board Of Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  |  |  | 1-for-2 |  |
Series AA-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |
Preferred stock, shares authorized |  |  |  | 8,427,004 |  |  | 8,427,004 |  |
Preferred stock Liquidation preference accretion rate |  |  |  |  |  |  | 8.00% |  |
Series AA-2 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  | $ 0.0001 |  |  | $ 0.0001 |  |
Preferred stock, shares authorized |  |  |  | 7,223,145 |  |  | 7,223,145 |  |
Series AA-2 Convertible Preferred Stock [Member] | Penelope Mining LLC [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  | 20 days |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  | 75,000,000 |  |  | 75,000,000 |  |
Minimum [Member] | Series AA-2 Convertible Preferred Stock [Member] | Penelope Mining LLC [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Closing price of common stock | $ / shares |  |  |  |  |  |  | $ 15.12 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares authorized |  |  |  | 150,000,000 |  |  | 150,000,000 |  |
Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  | 450,000 |  |  |  |  |  |  |
Additional shares authorized for stock-based compensation |  |  |  |  |  |  | 200,000 |  |
Common Stock [Member] | Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Exercise price of incentive option granted |  |  |  |  |  |  | With respect to each grant of an ISO to a participant who is not a ten percent stockholder, the exercise price shall not be less than the fair market value of a share on the date the ISO is granted. With respect to each grant of an ISO to a participant who is a ten percent stockholder, the exercise price shall not be less than one hundred ten percent (110%) of the fair market value of a share on the date the ISO is granted. |  |
Maximum aggregate number of Shares with respect to one or more Awards that may be granted to any one person during any calendar year |  | 83,333 |  |  |  |  |  |  |
Maximum aggregate amount of cash that may be paid in cash to any person during any calendar year | $ |  | $ 2,000,000 |  |  |  |  |  |  |
Common Stock [Member] | Incentive Stock Options [Member] | Minimum [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Eligible employee threshold percentage |  |  |  |  |  |  | 10.00% |  |
Purchase price of common stock percentage |  |  |  |  |  |  | 110.00% |  |

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