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Goodwill and Intangible Assets, Net - Future Amortization (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 (remaining six months) $ 3,041  
2018 6,081  
2019 6,081  
2020 4,427  
2021 100  
2024 and thereafter 66  
Net Book Value $ 19,796 $ 21,936