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Property and Equipment and Website Development Costs, Net - Summary of Website Development Cost Activity (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Website development costs, beginning balance	$ 2,687,727
Costs capitalized during the period: Stock-based costs	2,191,132	$ 843,841
Website development costs, ending balance	4,196,794
Website Development Costs [Member]
Website development costs, beginning balance	3,145,308
Costs capitalized during the period: Payroll-based costs	1,132,339
Costs capitalized during the period: Stock-based costs	1,146,396
Website development costs, ending balance	$ 5,424,043

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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