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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions		1 Months Ended		12 Months Ended
	Mar. 11, 2015	Mar. 31, 2016	Feb. 28, 2011	Dec. 31, 2018	Dec. 31, 2017	Dec. 09, 2002	May 26, 1998
Gain Contingencies [Line Items]
Income derived from Cambridge RPC's				$ 12,986
Post finance cost proceeds						5.00%	5.00%
Consultants contingent success fees				230,500
Cash and cash equivalents				2,786,832	$ 1,108,193
Working capital deficit				37,400,000
Total assets				5,473,170	$ 2,972,426
Penelope Mining LLC [Member]
Gain Contingencies [Line Items]
Investment in convertible preferred stock	$ 101,000,000
Investment agreement period	3 years
MINOSA [Member]
Gain Contingencies [Line Items]
Amount of debt financed	$ 14,750,000
Bank loan amount				$ 14,750,000
Bank loan maturity date				Dec. 31, 2018
Oceanica Resources S. de. R.L [Member]
Gain Contingencies [Line Items]
Grant and potential future issuance of new equity shares		3.0
Maximum [Member]
Gain Contingencies [Line Items]
Consultants contingent success fees		$ 425,000
Maximum [Member] | Galt Resources [Member]
Gain Contingencies [Line Items]
Investment for future revenue rights			$ 7,512,500
Seattle and Cambridge Projects [Member]
Gain Contingencies [Line Items]
Deferred income from revenue participation rights				$ 887,500

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