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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies [Abstract]      
Total rental expenses $ 878 $ 868 $ 1,078
Future minimum payments under non-cancelable operating leases [Abstract]      
2019 872    
2020 858    
2021 802    
2022 737    
2023 669    
Thereafter 1,389    
Future minimum payments, Total 5,327    
Maturities of Time Deposits [Abstract]      
2019 49,051    
2020 8,343    
2021 3,505    
2022 1,863    
2023 146    
Time deposits, Total $ 62,908