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Property and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 6,673,179 $ 4,651,641
Less: accumulated depreciation and amortization (3,725,015) (2,111,127)
Property and equipment, net 2,948,164 2,540,514
Furniture, fixtures and vehicle [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 153,909 98,564
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 $ 5,827,771 3,933,600
Estimated Useful Lives 3 years  
Computers and software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 691,499 $ 619,477
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