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Intangible Assets and Goodwill - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 61  
2019 237  
2020 235  
2021 235  
2022 235  
Thereafter 1,961  
Intangible assets $ 2,964 $ 2,860