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Acquisitions, Intangible Assets and Goodwill - Summary of Future Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Acquisition intangible assets, net, Net Carrying Amount $ 21,456 $ 9,324
Capitalized Internal-Use Software, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 5,946  
2020 6,735  
2021 1,900  
2022 136  
2023 0  
Thereafter 0  
Acquisition intangible assets, net, Net Carrying Amount 14,717  
Acquisition Intangible Assets, Net    
Finite Lived Intangible Assets [Line Items]    
Remainder of 2019 4,337  
2020 7,904  
2021 6,657  
2022 2,251  
2023 246  
Thereafter 61  
Acquisition intangible assets, net, Net Carrying Amount $ 21,456