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Net loss per share
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Net loss per share
Net loss per share 
The following table sets forth the computation of the basic and diluted net loss per share for the periods indicated (in thousands, except per share amounts): 
 
Three Months Ended
March 31,
 
2019
 
2018
Numerator:
    
 
 
Net loss
$
(14,091
)
 
$
(18,246
)
Denominator:
 

 
 

Weighted average shares used to compute per share amount:
 

 
 

Basic
46,414

 
44,259

Diluted
46,414

 
44,259

 
 
 
 
Basic net loss per share
$
(0.30
)
 
$
(0.41
)
Diluted net loss per share
$
(0.30
)
 
$
(0.41
)
 
The Company has excluded the impact of the following outstanding employee stock options and restricted stock units as well as the shares expected to be issued under its employee stock purchase plan from the computation of diluted net loss per share, as their effect would have been antidilutive (in thousands): 
 
March 31, 2019
 
March 31, 2018
Employee stock options
3,145

 
3,940

Restricted stock units
2,419

 
2,377

Market-based restricted stock units
677

 
—

Employee stock purchase plan
414

 
411

 
6,655

 
6,728