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Stockholders' Equity (Deficit) - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 09, 2019 shares | Jul. 08, 2019 $ / shares shares | Jun. 09, 2015 USD ($) shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) d $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares shares | Mar. 26, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, par value | $ / shares |  |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |
Preferred stock, shares authorized |  |  |  | 24,984,166 |  | 24,984,166 |  | 24,984,166 |
Share-based compensation expense | $ |  |  |  | $ 105,162 | $ 23,000 | $ 210,324 | $ 46,000 |  |
Poplar Falls LLC [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  |  |  |  | $ 3.99 |  | $ 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] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Business combination number of shares issued or issuable |  |  |  |  |  | 249,584 |  |  |
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 |  | $ 5.756 |  | $ 12.00 |  | $ 12.00 |  |  |
Number of warrants |  |  |  | 65,625 |  | 65,625 |  |  |
Warrants, expiration date |  | Jul. 12, 2024 |  |  |  | Jul. 21, 2021 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 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 |  |  |  |  |  |
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 |  | $ 0.0001 |  |  |
Preferred stock, shares authorized |  |  |  | 7,223,145 |  | 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 |  | $ 0.0001 |  |  |
Preferred stock, shares authorized |  |  |  | 8,427,004 |  | 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
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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