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NET LOSS PER SHARE
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Net Loss Per Share
NET LOSS PER SHARE OF COMMON STOCK
Basic net income (loss) per share of common stock is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding for the period. Diluted net income per share of common stock is computed using the weighted average number of shares of common stock outstanding plus the effect of common stock equivalents, unless the common stock equivalents are anti-dilutive. Potential dilutive common stock includes stock options and restricted stock units. Since we had net losses in the years ended December 31, 2012, 2011 and 2010, none of the stock options and restricted stock units were included in the computation of diluted shares for these periods, as inclusion of such shares would have been anti-dilutive.
The following table summarizes the incremental shares of common stock from potentially dilutive securities, calculated using the treasury stock method (in thousands, except for per share data):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Basic and diluted net loss per share of common stock:
 
 
 
 
 
Numerator:
 
 
 
 
 
     Net loss
$
(19,319
)
 
$
(17,950
)
 
$
(33,403
)
Denominator:
 
 
 
 
 
Weighted-average shares outstanding - basic
58,538

 
55,299

 
50,073

Effect of dilutive potential common shares from stock options and restricted stock units
—

 
—

 
—

Weighted-average shares outstanding - diluted
58,538

 
55,299

 
50,073

Net loss per share of common stock:
 
 
 
 
 
     Basic and diluted
$
(0.33
)
 
$
(0.32
)
 
$
(0.67
)

All outstanding options to purchase our common stock and restricted stock units are potentially dilutive securities. As of December 31, 2012, 2011 and 2010 , the combined total of options to purchase common stock and restricted stock units outstanding were 7.6 million, 6.7 million and 6.6 million, respectively.