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Significant Accounting Policies - Schedule of Property and Equipment Recorded at Cost and Depreciated on Straight-line Basis Over Estimated Useful Lives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 72,325 $ 61,346
Less: Accumulated depreciation (30,843) (21,606)
Property and equipment, net 41,482 39,740
Computer Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 29,300 19,622
Computer Software | Minimum    
Property Plant And Equipment [Line Items]    
Estimated useful lives 18 months  
Computer Software | Maximum    
Property Plant And Equipment [Line Items]    
Estimated useful lives 5 years  
Computer Hardware    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 19,461 20,523
Computer Hardware | Minimum    
Property Plant And Equipment [Line Items]    
Estimated useful lives 3 years  
Computer Hardware | Maximum    
Property Plant And Equipment [Line Items]    
Estimated useful lives 5 years  
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 4,970 3,879
Estimated useful lives 10 years  
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 18,594 $ 17,322
Estimated useful lives Lesser of useful life or lease term