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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 86,910 $ 65,520
Less accumulated depreciation (34,442) (22,226)
Property and equipment, net 52,468 43,294
Computer Equipment and Purchased Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 8,163 4,571
Employee Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 8,972 4,260
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 13,019 11,083
Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 2,551 2,620
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 42,894 33,446
Equipment under Capital Lease [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,450 3,450
Internal-Use Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment 5,363 2,892
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 2,498 $ 3,198