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Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 44,072 $ 35,743
Less accumulated depreciation and amortization (16,504) (11,474)
Property and equipment, net 27,568 24,269
Computer Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 7,905 4,208
Capitalized Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 181 252
Capitalized Website Development Costs    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,767 6,907
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 6,648 4,584
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 19,483 10,821
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross   $ 8,971
Finance Lease Right-of-use Assets    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 88