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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 28, 2018
Earnings Per Share [Abstract]  
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations
The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except per share amounts):
 
Three months ended
Nine months ended
 
September 28,
2018
 
September 29,
2017
September 28,
2018
 
September 29,
2017
Numerator:
 
 
 
 
 
 
Net loss
$
(7,758
)
 
$
(15,583
)
$
(24,365
)
 
$
(71,110
)
Denominator:
 
 
 
 
 
 
Weighted average number of common shares outstanding
 
 
 
 
 
 
Basic and diluted
86,321

 
81,445

85,188

 
80,618

Net loss per share:
 
 
 
 
 
 
Basic and diluted
$
(0.09
)
 
$
(0.19
)
$
(0.29
)
 
$
(0.88
)
Anti-dilutive Securities
The following table sets forth the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands):
 
Three months ended
Nine months ended
 
September 28,
2018
 
September 29,
2017
September 28,
2018
 
September 29,
2017
Stock options
3,219

 
4,377

3,386

 
4,628

RSUs
3,266

 
3,213

2,933

 
3,107

Stock purchase rights under the ESPP
529

 
1,118

635

 
630

Warrants (1)
1,555

 
782

1,039

 
782

   Total (2)
8,569

 
9,490

7,993

 
9,147