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Net Loss per Share
 6 Months Ended
Jun. 28, 2014
Earnings Per Share [Abstract]  
Net Loss per Share
Net Loss per Share
Basic net loss per share is calculated by dividing net loss attributable to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted net loss per share is calculated on the basis of the weighted-average number of shares of common stock including the effect of potential dilution that could occur if securities to issue common stock were exercised or converted into common stock.
 
 
Three Months Ended
 
Six Months Ended
 
June 28,
2014

June 29,
2013
 
June 28,
2014
 
June 29,
2013
Numerator:
 
 
 
 
 
 
 
Net loss
$
(5,964
)
 
$
(448
)
 
$
(15,957
)
 
$
(1,656
)
Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding
33,274

 
32,171

 
33,105

 
32,051

Less: weighted average unvested shares of common stock subject to repurchase
—

 
—

 
—

 
3

Weighted average common shares used in computing basic and diluted net loss per share
33,274

 
32,171

 
33,105

 
32,048

   Basic and diluted net loss per share
$
(0.18
)
 
$
(0.01
)
 
$
(0.48
)
 
$
(0.05
)
Historical outstanding anti-dilutive securities not included in diluted net loss per share calculation:
 
 
 
 
 
 
 
Common stock options and awards
8,475

 
8,550

 
8,475

 
8,550

Common stock warrants
2

 
2

 
2

 
2

 
8,477

 
8,552

 
8,477

 
8,552