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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	Jul. 08, 2019 $ / shares shares	Jun. 09, 2015 USD ($) shares	Dec. 31, 2021 USD ($) Directors Incentive_Plan d $ / shares shares	Dec. 31, 2020 USD ($) Directors $ / shares shares	Dec. 31, 2019 USD ($) Directors $ / shares 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 \| $							$ 1,330,078	$ 471,121	$ 756,599
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 \| $							$ 55,392	$ 98,129	$ 15,564
Aggregate intrinsic values of options outstanding \| $							55,392	98,129	15,564
Aggregate intrinsic values of options exercised \| $							0	0	0
Total fair value of shares vested \| $							$ 0	0	0
Number of warrants							3,481,314
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,901,985
Sale of Stock, Number of Shares Issued in Transaction	2,553,314
Offering costs paid on sale of common stock \| $	$ 300,000
Net proceeds received from sale of stock \| $	$ 11,200,000						$ 0	11,315,000	0
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
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
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 \| $							$ 1,213,525	653,653	0
Fair value of unvested restricted stock awards \| $							$ 1,438,887	$ 1,770,676	$ 132,917
Weighted-average grant date fair value of restricted stock awards \| $ / shares							$ 7.05	$ 4.0	$ 0
Weighted-average remaining contractual term							1 year 1 month 6 days	2 years	9 months 18 days
Total unrecognized compensation cost related to unvested restricted stock awards \| $							$ 1,349,419
Cuota Appreciation Rights [Member] \| Key Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and Outstanding							385,580
Cuota Appreciation Rights [Member] \| Non Employee Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested and Outstanding							292,663
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]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,901,985						0	56,228	0
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%)