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Schedule of Estimated Amortization Expense, Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 (remainder of year from April 1, 2018 to December 31, 2018) $ 184  
2019 239  
2020 236  
2021 236  
2022 128  
Thereafter 355  
Total $ 1,378 $ 1,440