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Property and Equipment
12 Months Ended
Dec. 31, 2011
Property and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property and Equipment

Property and equipment consisted of the following (in thousands):
 
 
December 31,
2011
 
December 31,
2010
Land
 
$
644

 
$
644

Manufacturing equipment
 
19,384

 
18,128

Office equipment and software
 
32,372

 
26,152

Leasehold improvements
 
7,460

 
5,975

 
 
59,860

 
50,899

Less: accumulated depreciation and amortization
 
(44,494
)
 
(41,412
)
Property and equipment, net
 
$
15,366

 
$
9,487


Depreciation and amortization expense for property and equipment for the years ended December 31, 2011, 2010 and 2009 was $5.4 million, $5.1 million and $6.3 million.