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Investment in Unconsolidated Entity - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investment carrying value	$ 973,159		$ 752,667
Greg Stemm [Member]
Schedule of Equity Method Investments [Line Items]
Investment carrying value	$ 973,159
Chatham Rock Phosphate, Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Investment carrying value				$ 0
Deep sea mining exploratory services				$ 1,680,000
Shares received from CRP		141,884		9,320,348
Outstanding equity stake in CRP		1.00%
Neptune Minerals, Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	14.00%
Investment carrying value			$ 0
Neptune Minerals, Inc. [Member] | Common Class A [Member]
Schedule of Equity Method Investments [Line Items]
Shares owned			0
Neptune Minerals, Inc. [Member] | Common Class B Non Voting Shares [Member]
Schedule of Equity Method Investments [Line Items]
Current investment position in NMI	3,092,488
Aggregate number of shares converted	261,200
Neptune Minerals, Inc. [Member] | Series A Preferred Non Voting Shares [Member]
Schedule of Equity Method Investments [Line Items]
Current investment position in NMI	2,612
Dorado Ocean Resources, Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Loss from unconsolidated entity			$ 21,300,000

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