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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments
    Future Minimum  
(in thousands)   Lease Payments  
2018   $ 679  
2019     856  
2020     506  
2021     439  
2022 and thereafter     112  
Total minimum lease payments   $ 2,592