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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Leases, Future Minimum Payments Due [Abstract]        
2018 $ 448   $ 448  
2019 906   906  
2020 829   829  
2021 476   476  
2022 and thereafter 130   130  
Total minimum lease payments 2,789   2,789  
Operating lease expense $ 200 $ 400 $ 500 $ 700