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Commitments and Contingencies - Additional Information (Detail) - USD ($) shares in Millions		1 Months Ended	3 Months Ended
	Mar. 11, 2015	Mar. 31, 2016	Jun. 30, 2019	Dec. 31, 2018
Gain Contingencies [Line Items]
Cash and cash equivalents			$ 372,486	$ 2,786,832
Working capital deficit			44,000,000
Total assets			2,496,226	$ 5,473,170
Cash Lease Obligation			$ 751,099
Building [Member]
Gain Contingencies [Line Items]
Effective Date Of Operating Lease Agreement			Aug. 01, 2019
Cash Lease Obligation			$ 751,099
Lease Obligation			$ 590,612
Rate Of Discount Used			10.00%
Tenure Of Lease Agreement			5 years
Right Of Use Asset			$ 590,612
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
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] | Building [Member]
Gain Contingencies [Line Items]
Monthly Lease Payments			13,269
Minimum [Member] | Building [Member]
Gain Contingencies [Line Items]
Monthly Lease Payments			$ 11,789

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