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Net Loss Per Share (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Effect of dilutive securities excluded $ 5,770 $ 2,909 $ 5,455 $ 2,712