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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2017
Website development [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 3 years
Computers and equipment [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 5 years
Leasehold improvements [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life Shorter of estimated useful life or remaining lease term
Furniture and fixtures [Member]  
Property, Plant and Equipment [Line Items]  
Property and equipment, estimated useful life 7 years