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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 16,738,898	$ 17,605,028
Less: Accumulated depreciation	(16,145,082)	(15,809,774)
Total property and equipment	593,816	1,795,254
Marine Asset Held for Sale [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross		416,329
Computers and Peripherals [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,278,461	1,281,469
Furniture and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,625,028	2,576,222
Marine Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 12,835,409	$ 13,331,008

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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