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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating Leases, Future Minimum Payments Due [Abstract]        
2018 $ 224   $ 224  
2019 906   906  
2020 829   829  
2021 476   476  
2022 and thereafter 130   130  
Total minimum lease payments 2,565   2,565  
Operating lease expense $ 200 $ 300 $ 700 $ 1,100