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Stockholders' Equity/(Deficit) - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 $ / shares shares | Mar. 21, 2017 shares | Oct. 01, 2016 d $ / shares | Mar. 18, 2016 d $ / shares | Jun. 09, 2015 USD ($) shares | Apr. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | Dec. 31, 2016 USD ($) Directors $ / shares | Sep. 30, 2016 Directors | Jun. 30, 2016 Directors | Dec. 31, 2018 USD ($) d Incentive_Plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  | 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 | $ |  |  |  |  |  |  |  |  |  |  | $ 415,615 | $ 833,985 | $ 1,778,461
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 | $ 0.00 | $ 1.75
Aggregate intrinsic values of options exercisable | $ |  |  |  |  |  |  |  | $ 16,633 |  |  | $ 15,564 | $ 0 | $ 16,633
Aggregate intrinsic values of options outstanding | $ |  |  |  |  |  |  |  | 16,633 |  |  | 15,564 | 0 | 16,633
Aggregate intrinsic values of options exercised | $ |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total fair value of shares vested | $ |  |  |  |  |  |  |  |  |  |  | 0 | 231,952 | 828,497
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 |  |  |  |  |  |  |  |
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 | d |  |  |  |  |  |  |  |  |  |  | 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 | $ |  |  |  |  |  |  |  |  |  |  |  | 99,998 | 299,294
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 |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant right exercise price | $ / shares |  |  | $ 3.52 |  |  |  |  |  |  |  |  |  |
Warrant Expiration Date |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2021 |  |
Warrant right exercise price description |  |  |  |  |  |  |  |  |  |  | Warrant shall be the number determined by multiplying 120,000 by a fraction, (a) the numerator of which is the aggregate principal amount of advances that have been extended to the OME by Epsilon pursuant to the Restated Note Purchase Agreement on or after the date of the Warrant and prior to the date of such failure and (b) the denominator of which is $3.0 million. |  |
Conversion price of Notes | $ / shares |  |  | $ 5.00 | $ 5.00 |  | $ 3.3 |  |  |  |  |  |  |
Conversion of stock, shares Issued |  | 670,455 |  |  |  | 670,455 | 670,455 |  |  |  | 670,455 |  |
Accrued interest | $ |  |  |  |  |  | $ 5,000,000 | $ 302,274 |  |  |  |  |  |
Number of trading days | d |  |  | 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 | $ |  |  |  |  |  |  |  |  |  |  | $ 323,614 | 408,466 | 715,406
Fair value of unvested restricted stock awards | $ |  |  |  |  |  |  |  | $ 817,110 |  |  | $ 460,000 | $ 500,754 | $ 817,110
Weighted-average grant date fair value of restricted stock awards | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 | $ 3.54
Weighted-average remaining contractual term |  |  |  |  |  |  |  |  |  |  | 9 months 18 days | 1 year | 2 years
Total unrecognized compensation cost related to unvested restricted stock awards | $ |  |  |  |  |  |  |  |  |  |  | $ 69,000 |  |
Cuota Appreciation Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs associated | $ |  |  |  |  |  |  |  |  |  |  | 0 |  |
Liability associated | $ |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Cuota Appreciation Rights [Member] | Key Employee Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vested |  |  |  |  |  |  |  |  |  |  | 249,880 |  |
Excersisable |  |  |  |  |  |  |  |  |  |  | 0 |  |
Cuota Appreciation Rights [Member] | Non Employee Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Vested |  |  |  |  |  |  |  |  |  |  | 278,000 |  |
Vested and Outstanding |  |  |  |  |  |  |  |  |  |  | 500,000 |  |
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 | $ 1.53 |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock and warrants sold | 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock, shares | 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of repurchased shares | $ / shares | $ 7.155 |  |  |  |  |  |  |  |  |  |  |  |
Warrant right exercise price | $ / shares | $ 7.155 |  |  |  |  |  |  |  |  |  |  |  |
Warrant Expiration Date | Nov. 02, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Warrant right exercise price description | The warrants have an exercise price of $7.155 per share of common stock and are exercisable in accordance with their terms at any time on or before the close of business on November 2, 2023. |  |  |  |  |  |  |  |  |  |  |  |
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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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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