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Loans Payable - Note 3 - MINOSA - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) Tranches	Dec. 31, 2018 USD ($)	Dec. 31, 2017	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		$ 14,750,000
MINOSA [Member]
Debt Instrument [Line Items]
Debt, interest expense	$ 1,180,000	$ 1,180,000
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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