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Exercise price per share or per unit of warrants or rights outstanding.

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Face amount or stated value per share of common stock.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stockholders' Equity/(Deficit) - Additional Information (Detail)			1 Months Ended	3 Months Ended			12 Months Ended
	Feb. 09, 2016	Jun. 09, 2015 USD ($) shares	Mar. 31, 2015 USD ($) shares	Dec. 31, 2016 USD ($) Directors $ / shares shares	Sep. 30, 2016 Directors	Jun. 30, 2016 Directors	Dec. 31, 2016 USD ($) Incentive_Plan $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Mar. 31, 2016 $ / 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 \| $				$ 772			$ 772	$ 754
Number of warrants				120,000			120,000
Warrants, exercise price \| $ / shares										$ 1.00
Preferred stock, par value \| $ / shares				$ 0.0001			$ 0.0001	$ 0.0001
Preferred stock, shares authorized				24,984,166			24,984,166	24,984,166
Number of stock incentive plans \| Incentive_Plan							2
Stock incentive plan expiration date							Aug. 31, 2015
Share-based compensation \| $							$ 1,778,461	$ 2,348,744	$ 2,081,482
Weighted average fair value of options granted \| $ / shares							$ 0
Number of outside directors granted quarterly fees \| Directors				2	2	2
Weighted average estimated fair value of stock options \| $ / shares				$ 1.75			$ 1.75	$ 8.52	$ 14.88
Aggregate intrinsic values of options exercisable \| $				$ 16,633			$ 16,633	$ 0	$ 0
Aggregate intrinsic values of options outstanding \| $				16,633			16,633	0	0
Aggregate intrinsic values of options exercised \| $							0	0	0
Total fair value of shares vested \| $							828,497	1,449,216	1,154,984
Total unrecognized compensation related to unvested share-based compensation awards \| $				$ 229,283			$ 229,283
Weighted-average period							1 year
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
Class of Warrant One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants				40,000			40,000
Warrants, exercise price \| $ / shares				$ 3.52			$ 3.52
Warrants, expiration date							Jan. 10, 2021
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			$ 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
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%
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
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 \| $							$ 715,406	318,000	911,641
Fair value of unvested restricted stock awards \| $				$ 817,110			$ 817,110	$ 300,334	$ 1,158,684
Weighted-average grant date fair value of restricted stock awards \| $ / shares							$ 3.54	$ 12.48	$ 17.16
Weighted-average remaining contractual term							2 years	2 years 7 months 6 days	3 years 7 months 6 days
Total unrecognized compensation cost related to unvested restricted stock awards \| $				$ 1,242,964			$ 1,242,964
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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reverse stock split, conversion ratio							0.08333
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%