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Loans Payable - Note 3 - MINOSA - Additional Information (Detail)		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 15, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Tranches	Sep. 30, 2020 USD ($)	Dec. 31, 2017	Dec. 31, 2020 USD ($)	Oct. 01, 2016 USD ($)	Mar. 11, 2015 USD ($)
Debt Instrument [Line Items]
Promissory note face amount								$ 3,000,000.0
Debt discount amount			$ 1,063,811		$ 1,063,811
Oceanica Call Option [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Derivative, fixed value		$ 40,000,000.0		$ 40,000,000.0
Promissory Note [Member] | Oceanica Resources S. de. R.L [Member]
Debt Instrument [Line Items]
Promissory note outstanding amount		14,750,001		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		383,148
Debt discount amount		383,148		$ 383,148
Note 6 - MINOSA 2 [Member]
Debt Instrument [Line Items]
Debt instrument, threshold payment term				60 days		60 days
Debt, interest expense	$ 159,082
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		$ 14,750,000
MINOSA [Member]
Debt Instrument [Line Items]
Debt, interest expense		$ 297,424	$ 297,424	$ 882,574	$ 885,806
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				$ 40,000,000.0
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%		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		$ 14,750,000
Number of advances | Tranches				5

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