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Net Loss Per Share - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Stock options excluded from computation of earnings per share (in shares) 5,348,275 4,533,794 5,348,275 4,533,794