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Employee Benefit Plans, Defined Contribution Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Contribution Plan [Abstract]        
Employer contribution to 401 (k) defined contribution plan $ 108 $ 97 $ 207 $ 180