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Net Loss Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share

Basic net loss per share is computed by dividing the net loss attributable to common shares for the period by the weighted average number of common shares outstanding during the period.

Diluted net loss per share attributed to common shares is computed by dividing the net loss attributable to common shares for the period by the weighted average number of common and potential common shares outstanding during the period, if the effect of each class of potential common shares is dilutive. Potential common shares include restricted stock units and incremental shares of common stock issuable upon the exercise of stock options.

A summary of the net loss per share for the three months ended March 31, 2013 and 2012 is as follows (in thousands, except per share amounts):
 
 
Three Months Ended
 
March 31,
 
2013
 
2012
Net loss per share:
 
 
 
Numerator
 
 
 
Net loss
$
(12,405
)
 
$
(10,040
)
Denominator for basic and diluted net loss per share
 

 
 

Weighted-average common shares outstanding
37,034

 
35,199

Net loss per share — basic and diluted
$
(0.33
)
 
$
(0.29
)