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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 11,033,536	$ 16,738,898
Less: Accumulated depreciation	(10,915,557)	(16,145,082)
Total property and equipment	117,979	593,816
Computers and Peripherals [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,021,844	1,278,461
Furniture and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,907,116	2,625,028
Marine Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,104,576	$ 12,835,409

X

- Definition

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

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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.

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