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Subsequent Event - Additional Information (Detail) |  | 6 Months Ended
--- | --- | ---
Jul. 12, 2018 USD ($) Parties | Jun. 30, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items] |  |
Warrants exercise price | $ / shares |  | $ 3.52
Note And Warrant Purchase Agreement [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument conversion rate after sale of additional notes or date of closing |  | 8.00
Transfer of indebtedness after sale of additional notes or date of closing |  | $ 500,000
Warrants exercised to purchase common shares | shares |  | 31,250
Warrants exercise price | $ / shares |  | $ 12.00
Aldama Mining Company, S.de R.L. de C.V [Member] | Note And Warrant Purchase Agreement [Member] |  |
Subsequent Event [Line Items] |  |
Ownership interest in subsidiaries the note to be converted after sale of additional notes or date of closing |  | 7.50%
Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member] |  |
Subsequent Event [Line Items] |  |
Number of individuals purchase agreement entered into | Parties | 2 |
Debt instrument face amount | $ 500,000 |
Debt instrument interest rate | 8.00% |
Maximum [Member] | Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member] |  |
Subsequent Event [Line Items] |  |
Debt instrument to be issued | $ 500,000 |
Individual One [Member] | Minimum [Member] | Subsequent Event [Member] | Note And Warrant Purchase Agreement [Member] |  |
Subsequent Event [Line Items] |  |
Ownership percentage in company's common stock | 5.00% |

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