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Acquisitions, Intangible Assets and Goodwill - Summary of Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Acquisition intangible assets, net, Net Carrying Amount $ 36,116 $ 9,324
Capitalized Internal-Use Software, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 3,966  
2020 11,082  
2021 6,247  
2022 2,359  
2023 0  
Thereafter 0  
Acquisition intangible assets, net, Net Carrying Amount 23,654  
Acquisition Intangible Assets, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 3,224  
2020 11,876  
2021 10,096  
2022 5,170  
2023 1,899  
Thereafter 3,851  
Acquisition intangible assets, net, Net Carrying Amount $ 36,116