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NET LOSS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Summary of Incremental Shares of Common Stock from Potentially Dilutive Securities
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
)