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Stockholders' Equity (Deficit) - Additional Information (Detail) |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 USD ($) $ / shares shares | Aug. 14, 2020 $ / shares shares | Aug. 31, 2019 $ / shares | Jul. 09, 2019 shares | Jul. 08, 2019 $ / shares shares | Oct. 31, 2018 $ / shares shares | Jun. 09, 2015 USD ($) shares | Dec. 31, 2020 USD ($) d Incentive_Plan Directors $ / shares shares | Dec. 31, 2019 USD ($) Directors $ / shares shares | Dec. 31, 2018 USD ($) Directors $ / shares | Mar. 26, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares | $ 4.75 |  |  |  |  |  |  |  |  |  |
Number of trading days | d |  |  |  |  |  |  |  | 20 |  |  |
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 |  |  |  |  |  |  |  | 3 |  |  |
Stock incentive plan expiration date |  |  |  |  |  |  |  | Aug. 31, 2015 |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | $ 420,648 | $ 756,596 | $ 415,615 |
Weighted average fair value of options granted | $ / shares |  |  |  |  |  |  |  | $ 0 |  |  |
Number of outside directors granted quarterly fees | Directors |  |  |  |  |  |  |  | 0 | 0 | 0 |
Weighted average estimated fair value of stock options | $ / shares |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Aggregate intrinsic values of options exercisable | $ |  |  |  |  |  |  |  | $ 98,129 | $ 15,564 | $ 15,564 |
Aggregate intrinsic values of options outstanding | $ |  |  |  |  |  |  |  | 98,129 | 15,564 | 15,564 |
Aggregate intrinsic values of options exercised | $ |  |  |  |  |  |  |  | 0 | 0 | 0 |
Total fair value of shares vested | $ |  |  |  |  |  |  |  | $ 0 | 0 | 231,952 |
Number of warrants |  |  |  |  |  |  |  | 3,481,314 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 1,901,989 |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 2,553,314 |  |  |  |  |  |  |  |  |  |
Offering costs paid on sale of common stock | $ | $ 300,000 |  |  |  |  |  |  | $ 89,642 |  |  |
Net proceeds received from sale of stock | $ | $ 11,200,000 |  |  |  |  |  |  | $ 11,315,000 |  | 4,561,739 |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | 0.6 |  |  |  |  |  |  |  |  |  |
Purchase price of warrant | $ / shares | $ 4.543 |  |  |  |  |  |  |  |  |  |
Offering Fee Included in Offering Expenses | $ | $ 200,000 |  |  |  |  |  |  |  |  |  |
Poplar Falls LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  |  |  |  |  |  |  | $ 3.99 |  |  |
Accounting Standards Update 2017-01 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of ownership acquired |  |  |  |  |  |  |  | 79.90% |  |  |
Bismarck [Member] | Accounting Standards Update 2017-01 [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of ownership acquired |  |  |  | 79.90% |  |  |  |  |  |  |
Business combination number of shares issued or issuable |  |  |  | 249,584 |  |  |  |  |  |  |
Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  | $ 4.67 |  |  | $ 5.756 |  |  | $ 12.00 |  |  |
Number of warrants |  |  |  |  |  |  |  | 65,625 |  |  |
Warrants, expiration date |  | Aug. 14, 2023 |  | Jul. 21, 2021 | Jul. 12, 2024 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 131,996 |  |  | 196,135 |  |  |  |  |  |
Note And Warrant Purchase Agreement [Member] | Second Amendment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  |  |  |  | $ 5.756 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 196,135 |  |  |  |  |  |
2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  |  |  | 450,000 |  |  |  |
Director Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  | 675,000 |  |
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-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] | 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] | Poplar Falls LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock and warrants sold |  |  |  |  |  |  |  | 551,378 |  |  |
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 |  |  |
Incentive Stock Options [Member] | 2019 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award authorized by board |  |  |  |  |  |  |  |  |  |  | 800,000
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 | $ |  |  |  |  |  |  |  | $ 653,653 | 0 | 323,614 |
Fair value of unvested restricted stock awards | $ |  |  |  |  |  |  |  | $ 1,770,676 | $ 132,917 | $ 460,000 |
Weighted-average grant date fair value of restricted stock awards | $ / shares |  |  |  |  |  |  |  | $ 4.00 | $ 0 | $ 0 |
Weighted-average remaining contractual term |  |  |  |  |  |  |  | 2 years | 9 months 18 days | 9 months 18 days |
Total unrecognized compensation cost related to unvested restricted stock awards | $ |  |  |  |  |  |  |  | $ 804,496 |  |  |
Cuota Appreciation Rights [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  | 0 |  |  |
Liability associated | $ |  |  |  |  |  |  |  | $ 0 |  |  |
Cuota Appreciation Rights [Member] | Key Employee Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Excersisable |  |  |  |  |  |  |  | 0 |  |  |
Vested and Outstanding |  |  |  |  |  |  |  | 635,450 |  |  |
Cuota Appreciation Rights [Member] | Non Employee Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vested and Outstanding |  |  |  |  |  |  |  | 492,665 |  |  |
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 |  |  | $ 1.00 |  |  |  |  |  |  |  |
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 |  |  |  |  |
Warrants, 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. |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  | 56,228 |  |  |
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 |  |  |  |  |  |  |  | 0.00% |  |  |
Purchase price of common stock percentage |  |  |  |  |  |  |  | (110.00%) |  |  |

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