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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions		1 Months Ended	12 Months Ended
	Mar. 11, 2015	Feb. 28, 2011	Dec. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	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			227,000
Cash and cash equivalents			1,108,193		$ 1,662,643	$ 2,241,317	$ 3,143,550
Working capital deficit			31,500,000
Total assets			2,972,426		$ 5,083,665
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, 2017
Oceanica Resources S. de. R.L [Member]
Gain Contingencies [Line Items]
Grant and 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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