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Net Loss Per Share
 3 Months Ended
Mar. 31, 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 March 31,
(in thousands, except per share amounts)
2019
 
2018
Numerator for basic and diluted net loss per share:
 
 
 
Net loss attributable to 3D Systems Corporation
$
(24,394
)
 
$
(20,955
)
 
 
 
 
Denominator for basic and diluted net loss per share:
 
 
 
Weighted average shares
113,267

 
111,819

 
 
 
 
Net loss per share - basic and diluted
$
(0.22
)
 
$
(0.19
)


For the quarters ended March 31, 2019 and 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 were 5,534 for the quarter ended March 31, 2019 compared to 4,345 for the quarter ended March 31, 2018.