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Goodwill and Intangible Assets - Summary of Estimated Amortization of Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 316  
2019 315  
2020 315  
2021 164  
2022 85  
Thereafter 0  
Total $ 1,195 $ 1,723