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Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 60,267 $ 42,999
Less accumulated depreciation and amortization (19,666) (12,798)
Property and equipment, net 40,601 30,201
Computer Equipment and Purchased Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 4,212 3,237
Employee Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,256 1,534
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 10,860 8,174
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 2,467 2,326
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 32,107 23,693
Equipment under Capital Lease [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,453 2,412
Internal-Use Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 2,594 1,301
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 1,318 $ 322