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Related Party Transactions - Additional Information (Detail)		12 Months Ended
	Dec. 09, 2002 Directors	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Aug. 14, 2014 USD ($)	May. 31, 2014 USD ($)	May. 10, 2012 USD ($)	May. 26, 1998
Related Party Transaction [Line Items]
Post finance cost proceeds	5.00%							5.00%
Aggregate amount issuable							$ 8,000,000
Project Term Loans [Member]
Related Party Transaction [Line Items]
Aggregate amount issuable		$ 10,000,000			$ 10,000,000	$ 10,000,000
Georgia LLC [Member]
Related Party Transaction [Line Items]
Post finance cost proceeds	5.00%
Directors' interest in ownership of Company	58.00%
Officers and directors owning an interest in the limited liability | Directors	2
Monaco [Member]
Related Party Transaction [Line Items]
Accounts receivable		629,400
Monaco [Member] | Project Term Loans [Member]
Related Party Transaction [Line Items]
Revenue from coin sales		1,605,676	$ 304,674	$ 0
Accounts receivable		$ 629,400	$ 87,399

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Number of officers and directors owning interest in limited liability company.

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Percentage of proceeds from shipwrecks receivable under agreement.

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Revenue from coin sales.

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.9)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Article 5

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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