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NET LOSS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2011
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,
 
2013
 
2012
 
2011
Basic and diluted net loss per share of common stock:
 
 
 
 
 
Numerator:
 
 
 
 
 
     Net loss
$
(10,975
)
 
$
(19,319
)
 
$
(17,950
)
Denominator:
 
 
 
 
 
Weighted-average shares outstanding - basic
58,944

 
58,538

 
55,299

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

 
—

 
—

Weighted-average shares outstanding - diluted
58,944

 
58,538

 
55,299

Net loss per share of common stock:
 
 
 
 
 
     Basic and diluted
$
(0.19
)
 
$
(0.33
)
 
$
(0.32
)