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Intangible Assets and Goodwill - Summary of Future Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Acquisition intangible assets, net, Net Carrying Amount $ 8,299 $ 9,324
Capitalized Internal-Use Software, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 9,241  
2020 6,189  
2021 1,353  
2022 0  
Acquisition intangible assets, net, Net Carrying Amount 16,783  
Acquisition Intangible Assets, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 2,814  
2020 2,952  
2021 1,705  
2022 828  
Acquisition intangible assets, net, Net Carrying Amount $ 8,299