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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 982  
2019 2,511  
2020 2,131  
2021 2,101  
2022 1,215  
Thereafter 946  
Intangible assets, net $ 9,886 $ 11,517