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Stockholders' Equity/(Deficit) - Additional Information (Detail)			1 Months Ended	12 Months Ended
	Feb. 09, 2016	Jun. 09, 2015 USD ($) shares	Mar. 31, 2015 USD ($) shares	Dec. 31, 2015 USD ($) Incentive_Plan $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reverse stock split, conversion ratio		0.16666		0.08333
Common stock shares authorized				75,000,000	75,000,000
Common stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Common stock, shares value representing payment for principal \| $				$ 754	$ 8,558
Warrants to purchase shares of common stock outstanding				0	0
Preferred stock, par value \| $ / shares				$ 0.0001	$ 0.0001
Preferred stock, shares authorized				806,267	806,267
Number of stock incentive plans \| Incentive_Plan				2
Stock incentive plan expiration date				Aug. 31, 2015
Share-based compensation \| $				$ 2,348,744	$ 2,081,482	$ 2,582,009
Weighted average estimated fair value of stock options \| $ / shares				$ 8.52	$ 14.88	$ 17.04
Aggregate intrinsic values of options exercisable \| $				$ 0	$ 0	$ 16,450
Aggregate intrinsic values of options outstanding \| $				0	0	16,450
Aggregate intrinsic values of options exercised \| $				0	0	183,000
Total fair value of shares vested \| $				1,449,216	1,154,984	832,177
Total unrecognized compensation related to unvested share-based compensation awards \| $				$ 1,019,120
Weighted-average period				1 year 2 months 1 day
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reverse stock split, conversion ratio	0.50000
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, shares value representing payment for principal \| $			$ 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				130,209
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-2 Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, par value \| $ / shares				$ 0.0001
Preferred stock, shares authorized				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
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
Preferred stock, shares authorized				8,427,004
Preferred stock Liquidation preference accretion rate				8.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized				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
Unvested Restricted Stock Awards Excluded from EPS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock, awards vested \| $				$ 318,000	911,641	854,861
Fair value of unvested restricted stock awards \| $				$ 300,334	$ 1,158,684	$ 380,013
Weighted-average grant date fair value of restricted stock awards \| $ / shares				$ 12.48	$ 17.16	$ 34.68
Weighted-average remaining contractual term				2 years 7 months 6 days	3 years 7 months 6 days	1 year 2 months 12 days
Total unrecognized compensation cost related to unvested restricted stock awards \| $				$ 1,142,573
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
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reverse stock split, conversion ratio				0.08333
Common stock, shares issued					107,513	366,045
Common stock, shares value representing payment for principal \| $					$ 2,420,863
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%