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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Leases, Future Minimum Payments Due [Abstract]    
2018 $ 669  
2019 905  
2020 827  
2021 474  
2022 and thereafter 129  
Total minimum lease payments 3,004  
Operating lease expense $ 300 $ 400