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Schedule of Estimated Amortization Expense, Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]      
2019 $ 236    
2020 236    
2021 236    
2022 128    
2023 125    
Thereafter 229    
Total $ 1,190 $ 1,440 $ 1,685