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Loans Payable - Note 3 - MINOSA - Additional Information (Detail)	4 Months Ended	9 Months Ended
	Jun. 30, 2015 Tranches	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 11, 2015 USD ($)	May 10, 2012 USD ($)
Debt Instrument [Line Items]
Promissory note face amount					$ 8,000,000
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
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	$ 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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