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Share based compensation awards options estimated weighted average grant date fair value.

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Share-based compensation arrangements by share-based payment award, stock appreciation rights, price per share of underlying shares.

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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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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Date the equity-based award expires, in CCYY-MM-DD format.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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
	Mar. 21, 2017 shares	Oct. 01, 2016 Days $ / shares	Mar. 18, 2016 Days $ / shares	Feb. 09, 2016	Jun. 09, 2015 USD ($) shares	Apr. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2016 USD ($) Directors $ / shares shares	Sep. 30, 2016 Directors	Jun. 30, 2016 Directors	Dec. 31, 2017 USD ($) Days Incentive_Plan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / 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
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
Compensation costs associated \| $											$ 833,985	$ 1,778,461	$ 2,348,744
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			$ 0.00	$ 1.75	$ 8.52
Aggregate intrinsic values of options exercisable \| $								$ 16,633			$ 0	$ 16,633	$ 0
Aggregate intrinsic values of options outstanding \| $								16,633			0	16,633	0
Aggregate intrinsic values of options exercised \| $											0	0	0
Total fair value of shares vested \| $											231,952	828,497	1,449,216
Total unrecognized compensation related to unvested share-based compensation awards \| $											$ 0
2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award authorized by board					450,000
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 \| Days											20
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%
Epsilon Acquisitions, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued interest \| $											$ 299,294	259,372
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
Notes Payable, Other Payables [Member] \| Epsilon Acquisitions, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion price of Notes \| $ / shares		$ 5.00	$ 5.00			$ 5.00
Conversion of stock, shares Issued	670,455					670,455	670,455				670,455
Accrued interest \| $						$ 3,300,000	$ 302,274
Number of trading days \| Days		75	75
Incentive Stock Options [Member] \| 2015 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award authorized by board					450,000
Additional shares authorized for stock-based compensation											200,000
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 \| $											$ 408,466	715,406	318,000
Fair value of unvested restricted stock awards \| $								$ 817,110			$ 500,754	$ 817,110	$ 300,334
Weighted-average grant date fair value of restricted stock awards \| $ / shares											$ 0	$ 3.54
Weighted-average remaining contractual term											1 year	2 years	2 years 7 months 6 days
Total unrecognized compensation cost related to unvested restricted stock awards \| $											$ 484,614
Cuota Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs associated \| $											0
Liability associated \| $											$ 0
Vested											0
Excersisable											0
Cuota Appreciation Rights [Member] \| Carrying Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of cuotas of Oceanica \| $ / shares											$ 3.00
Cuota Appreciation Rights [Member] \| Fair Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of cuotas of Oceanica \| $ / shares											$ 1.38
Cuota Appreciation Rights [Member] \| Maximum [Member] \| Key Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award authorized by board											750,000
Cuota Appreciation Rights [Member] \| Maximum [Member] \| Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award authorized by board											600,000
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%