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Loans Payable - Note 1 - Monaco 2014 - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 10, 2015 | Aug. 14, 2014 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2018 | Dec. 01, 2014 | Oct. 01, 2014
Note 1- Monaco 2014 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate amount issuable |  | $ 10,000,000 |  |  |  |  |  |
Interest rate, stated percentage |  | 11.00% |  |  |  |  |  |
Extinguishment of debt, amount | $ 2,200,000 |  |  |  |  |  |  |
Notes ceased to bear interest, amount | $ 5,000,000 |  |  |  |  |  |  |
Debt instrument maturity date | Dec. 31, 2017 |  | Apr. 01, 2018 |  |  |  |  |
Accrued interest |  |  |  | $ 507,741 | $ 308,800 |  |  |
Outstanding notes balance |  |  |  | 2,800,000 | 2,800,000 |  |  |
Note 1- Monaco 2014 [Member] | Oceanica Resources S. de. R.L [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Per share value of shares exercised by private investor |  | $ 3.15 |  |  |  |  |  |
Aggregate value of shares issued to lender |  | $ 1,000,000 |  |  |  |  |  |
Note 1- Monaco 2014 [Member] | Oceanica Resources S. de. R.L [Member] | Loan Modification March Two Thousand Sixteen [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Per share value of shares exercised by private investor |  |  | $ 1.00 |  |  |  |  |
Note 1- Monaco 2014 [Member] | First Tranche [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan amount borrowed |  | $ 5,000,000 |  |  |  |  |  |
Note 1- Monaco 2014 [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan amount borrowed |  |  |  |  |  |  |  | $ 2,500,000
Note 1- Monaco 2014 [Member] | Third Tranche [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan amount borrowed |  |  |  |  |  |  | $ 2,500,000 |
Note 2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate amount issuable |  |  | $ 1,825,000 | 1,825,000 |  |  |  |
Interest rate, stated percentage |  |  | 10.00% |  |  |  |  |
Debt instrument maturity date |  |  | Apr. 15, 2018 |  |  |  |  |
Accrued interest |  |  |  | 224,846 | $ 134,527 |  |  |
Debt default interest rate |  |  |  |  |  | 18.00% |  |
Outstanding notes balance |  |  |  | $ 1,175,000 |  |  |  |

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