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Goodwill and Intangible Assets, Net - Estimated Future Annual Amortization Expense Related to Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Estimated Future Amortization expense    
2018 (remaining 3 months) $ 1,778  
2019 7,018  
2020 5,883  
2021 2,325  
2022 2,216  
Thereafter 6,360  
Net $ 25,580 $ 29,041