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Net Loss Per Share
9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Net Loss Per Share
(9) Net Loss Per Share

The Company computes basic loss per share using net loss attributable to 3D Systems Corporation and the weighted average number of common shares outstanding during the applicable period. Diluted loss per share incorporates the additional shares issuable upon assumed exercise of stock options and the release of restricted stock and restricted stock units, except in such case when their inclusion would be anti-dilutive.
Quarter Ended September 30,Nine Months Ended September 30,
(in thousands, except per share amounts)2019201820192018
Numerator for basic and diluted net loss per share:
Net loss attributable to 3D Systems Corporation$(16,843) $(11,550) $(65,167) $(41,369) 
Denominator for basic and diluted net loss per share:
Weighted average shares114,053  112,534  113,587  112,095  
Net loss per share - basic and diluted$(0.15) $(0.10) $(0.57) $(0.37) 
For the quarters ended September 30, 2019 and September 30, 2018, the effect of dilutive securities, including non-vested stock options and restricted stock awards/units, was excluded from the denominator for the calculation of diluted net loss per share because the Company recognized a net loss for the period and their inclusion would be anti-dilutive. Dilutive securities excluded for the quarter and nine months ended September 30, 2019 were 5,786 compared to 5,770 and 5,455, respectively, for the quarter ended and nine months ended September 30, 2018.