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Loans Payable - Note 3 - MINOSA - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) Tranches | Mar. 31, 2018 USD ($) | Dec. 31, 2017 | Dec. 31, 2018 USD ($) | Mar. 11, 2015 USD ($)
Oceanica Call Option [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, fixed value | $ 40,000,000 |  |  |  |
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Promissory note outstanding amount | 14,750,001 |  |  |  |
Promissory Note [Member] | Deferred Income Call Option [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Promissory note outstanding amount | 383,148 |  |  |  |
Debt discount amount | $ 383,148 |  |  |  |
Note 6 - MINOSA 2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, threshold payment term | 60 days |  | 60 days |  |
Stock Purchase Agreement [Member] | Note 6 - MINOSA 2 [Member] | Promissory Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Promissory note face amount |  |  |  | $ 14,750,000 | $ 14,750,000
MINOSA [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, interest expense | $ 290,958 | $ 290,958 |  |  |
MINOSA [Member] | Promissory Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated market rate loan percentage | 15.00% |  |  |  |
MINOSA [Member] | Stock Purchase Agreement [Member] | Oceanica Call Option [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Share purchase agreement expiration date | Mar. 30, 2016 |  |  |  |
Stock granted during period, value | $ 40,000,000 |  |  |  |
Stock granted during period, percentage | 54.00% |  |  |  |
Call option expiration date | Mar. 11, 2016 |  |  |  |
MINOSA [Member] | Stock Purchase Agreement [Member] | Promissory Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 8.00% |  |  |  |
Promissory note outstanding amount | $ 14,750,000 |  |  |  |
Debt instrument maturity date | Mar. 18, 2017 |  |  |  |
Promissory note face amount | $ 14,750,000 |  |  |  |
Number of advances | Tranches | 5 |  |  |  |

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