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Commitments and Contingencies (Schedule of Annual Minimum Operating Lease Payments) (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 555
2019 1,023
2020 1,033
2021 795
2022 and thereafter 1,026
Total $ 4,432