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Net Loss Per Share (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Effect of dilutive securities excluded $ 4,168 $ 3,443 $ 4,167 $ 3,619