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Stockholders' Equity and Employee Stock Option Plans RSU and RSA activity (Tables)
 12 Months Ended
Dec. 31, 2012
RSU and RSA activity [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table provides additional information regarding RSU and RSA activity for the years ended December 31, 2012, 2011, and 2010:
 
 
Number Nonvested and Outstanding

 
Weighted-Average Grant Date Fair-Value

BALANCE AT DECEMBER 31, 2009
 
1,464,090

 
$
10.52

RSUs granted
 
1,628,183

 
8.02

RSUs vested and released
 
(722,806
)
 
10.06

RSUs cancelled
 
(168,298
)
 
9.76

BALANCE AT DECEMBER 31, 2010
 
2,201,169

 
$
8.88

RSUs and RSAs granted
 
1,381,070

 
8.74

RSUs vested and released
 
(580,075
)
 
10.55

RSUs cancelled
 
(480,571
)
 
8.96

BALANCE AT DECEMBER 31, 2011
 
2,521,593

 
$
8.40

RSUs granted
 
700,987

 
3.25

RSUs vested and released
 
(977,149
)
 
8.48

RSUs cancelled
 
(315,817
)
 
7.80

BALANCE AT DECEMBER 31, 2012
 
1,929,614

 
$
6.56