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Property and Equipment (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,425,274 $ 6,673,179
Less: accumulated depreciation and amortization (5,112,165) (3,725,015)
Property and equipment, net 3,313,109 2,948,164
Furniture, fixtures and vehicle [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 155,165 153,909
Furniture, fixtures and vehicle [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 2 years  
Furniture, fixtures and vehicle [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 5 years  
Website and internal use software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,565,702 5,827,771
Estimated Useful Lives 3 years  
Computers and software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 704,407 $ 691,499
Computers and software [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 3 years  
Computers and software [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 7 years