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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 41,336 $ 36,456
Accumulated depreciation and amortization (17,481) (14,138)
Property and equipment, net 23,855 22,318
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 17,471 16,039
Website and software development costs    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 17,231 14,501
Website and software development costs | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Lives (Years) 1 year  
Website and software development costs | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Lives (Years) 3 years  
Computer and office equipment    
Property, Plant and Equipment [Line Items]    
Useful Lives (Years) 3 years  
Property and equipment, gross $ 2,415 2,192
Software    
Property, Plant and Equipment [Line Items]    
Useful Lives (Years) 3 years  
Property and equipment, gross $ 594 685
Furniture    
Property, Plant and Equipment [Line Items]    
Useful Lives (Years) 7 years  
Property and equipment, gross $ 3,625 $ 3,039