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Stockholders' Equity (Deficit) - Additional Information (Detail) |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 09, 2016 | Jun. 09, 2015 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares | Jun. 30, 2018 USD ($) d Incentive_Plan $ / shares shares | Jun. 30, 2017 USD ($) | Dec. 31, 2017 $ / shares shares | Feb. 19, 2016 shares | Feb. 18, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  | 1-for-12 |  |  |  |
Reverse stock split, conversion ratio | 0.50000 | 0.16666 |  |  | 0.08333 |  |  |  |
Common stock shares authorized |  |  | 75,000,000 |  | 75,000,000 |  | 75,000,000 | 75,000,000 | 150,000,000
Common stock, par value | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  |
Preferred stock, par value | $ / shares |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |  |
Preferred stock, shares authorized |  |  | 24,984,166 |  | 24,984,166 |  | 24,984,166 |  |
Number of warrants |  |  | 120,000 |  | 120,000 |  |  |  |
Warrants, exercise price | $ / shares |  |  | $ 3.52 |  | $ 3.52 |  |  |  |
Warrants, expiration date |  |  |  |  | Oct. 01, 2021 |  |  |  |
Number of stock incentive plans | Incentive_Plan |  |  |  |  | 2 |  |  |  |
Stock incentive plan expiration date |  |  |  |  | Aug. 31, 2015 |  |  |  |
Share-based compensation | $ |  |  | $ 103,904 | $ 207,808 | $ 207,808 | $ 416,993 |  |  |
Weighted average fair value of options granted | $ / shares |  |  | $ 0 | $ 0 |  |  |  |  |
2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  | 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 |  |  |  |
Board Of Directors [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  | 1-for-2 |  |  |  |
Stockholders [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  |  | 1-for-6 |  |  |  |
Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  | 450,000 |  |  |  |  |  |  |
Additional shares authorized for stock-based compensation |  |  |  |  | 200,000 |  |  |  |
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 |  |  |  |  | 10.00% |  |  |  |
Purchase price of common stock percentage |  |  |  |  | 110.00% |  |  |  |

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