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Loans Payable - Note 8 - Promissory Note - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 12, 2018 USD ($) Parties | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2018 $ / shares | Oct. 04, 2018 USD ($) | Aug. 17, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  | $ 7.155 |  |
Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument face amount | $ 1,050,000 |  |  |  |  |  |
Number of individuals purchase agreement entered into | Parties | 2 |  |  |  |  |  |
Debt instrument interest rate | 8.00% |  |  |  |  |  |
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 |  | 50,000 |  |  |  |  |
Warrants exercise price | $ / shares |  | $ 12.00 |  |  |  |  |
Accrued interest |  | $ 21,510 | $ 0 |  |  |  |
Beneficial Conversion Feature ("BCF") [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, interest expense |  | 156,469 | $ 0 |  |  |  |
Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 1,050,000 |  |  |
Debt, interest expense |  | $ 231,090 |  |  |  |  |
Book value of debt |  |  |  | 231,090 |  |  |
Maximum [Member] | Beneficial Conversion Feature ("BCF") [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash proceeds from issuance of debt |  |  |  | $ 1,050,000 |  |  |
Aldama Mining Company, S.de R.L. de C.V [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ownership interest in subsidiaries the note to be converted after sale of additional notes or date of closing |  | 7.50% |  |  |  |  |
Debt Instrument, Redemption, Period One [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument face amount | $ 500,000 |  |  |  |  |  |
Debt Instrument, Redemption, Period Two [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  | $ 300,000
Debt Instrument, Redemption, Period Three [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 250,000 |
Individual One [Member] | Minimum [Member] | Note And Warrant Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ownership percentage in company's common stock | 5.00% |  |  |  |  |  |

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