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Commitments and Contingencies (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future minimum lease commitments      
2018 $ 1,096    
2019 1,115    
2020 1,095    
2021 201    
2022 13    
Thereafter 384    
Rental Expense      
Rent expense $ 2,347 $ 2,183 $ 2,361