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Net loss per share
 6 Months Ended
Jun. 30, 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
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Numerator:
    
 
 
 
    
 
 
Net loss
$
(7,326
)
 
$
(10,537
)
 
$
(21,417
)
 
$
(28,783
)
Denominator:
 

 
 

 
 
 
 
Weighted average shares used to compute per share amount:
 

 
 

 
 
 
 
Basic
46,754

 
44,665

 
46,585

 
44,463

Diluted
46,754

 
44,665

 
46,585

 
44,463

 
 
 
 
 
 
 
 
Basic net loss per share
$
(0.16
)
 
$
(0.24
)
 
$
(0.46
)
 
$
(0.65
)
Diluted net loss per share
$
(0.16
)
 
$
(0.24
)
 
$
(0.46
)
 
$
(0.65
)
 
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): 
 
June 30, 2019
 
June 30, 2018
Employee stock options
2,963

 
3,860

Restricted stock units
2,208

 
3,279

Market-based restricted stock units
647

 
—

Employee stock purchase plan
263

 
193

 
6,081

 
7,332