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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%)