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Property and Equipment, Net - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Total $ 22,863 $ 19,482
Less: accumulated depreciation and amortization (11,991) (8,728)
Property and equipment, net 10,872 10,754
Computer software and equipment    
Property, Plant and Equipment [Line Items]    
Total 11,625 9,089
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total 2,299 2,102
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total 7,096 6,452
Equipment under capital leases    
Property, Plant and Equipment [Line Items]    
Total $ 1,843 $ 1,839