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Intangible Assets - Schedule of Future Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 127  
2019 127  
2020 113  
2021 69  
2022 69  
Thereafter 121  
Total $ 626 $ 1,309