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Property and Equipment, Net - Schedule of Classes of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 26,308 $ 18,484
Less: Accumulated depreciation (8,903) (3,705)
Property and equipment, Net 17,405 14,779
Computer Equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 4,520 2,542
Purchased Software    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 7,735 6,686
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 4,306 2,563
Construction in Progress    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 102 2,319
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 9,645 $ 4,374