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Stockholders' Equity/(Deficit) - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 $ / shares shares | Oct. 01, 2016 d $ / shares shares | Mar. 18, 2016 d | Jun. 09, 2015 USD ($) shares | Mar. 26, 2019 $ / shares | Mar. 31, 2019 USD ($) d Incentive_Plan $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares | $ 7.155 |  |  |  |  |  |  |
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 |  |  |  |  |  | 2 |  |
Stock incentive plan expiration date |  |  |  |  |  | Aug. 31, 2015 |  |
Compensation costs associated | $ |  |  |  |  |  | $ 23,000 | $ 103,904 |
Weighted-average grant date fair value of restricted stock awards | $ / shares |  |  |  |  | $ 800,000 |  |  |
Number of warrants |  |  |  |  |  | 120,000 |  |
Warrants, expiration date |  |  |  |  |  | Oct. 01, 2021 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 700,000 |  |  |  |  |  |  |
Stock issued during theperiod share warrants |  |  |  |  |  | 120,000 |  |
Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  |  |  |  |  | $ 12.00 |  |
Number of warrants |  |  |  |  |  | 50,000 |  |
Warrants, expiration date |  |  |  |  |  | Jul. 21, 2021 |  |
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 |  |
Preferred stock, shares authorized |  |  |  |  |  | 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 |  |
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 |  |
Notes Payable, Other Payables [Member] | Epsilon Acquisitions, LLC [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Warrants, exercise price | $ / shares |  | $ 3.52 |  |  |  | $ 3.52 |  |
Warrant Expiration Date |  |  |  |  |  | Oct. 01, 2021 |  |
Warrant right exercise price description |  |  |  |  |  | Warrant shall be the number determined by multiplying 120,000 by a fraction, (a) the numerator of which is the aggregate principal amount of advances that have been extended to the OME by Epsilon pursuant to the Restated Note Purchase Agreement on or after the date of the Warrant and prior to the date of such failure and (b) the denominator of which is $3.0 million. |  |
Number of trading days | d |  | 75 | 75 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 120,000 |  |  |  |  |  |
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 |  |
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. |  |  |  |  |  |  |
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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