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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%