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

Major classifications of property and equipment and estimated useful lives are as follows:

 

Estimated

As of December 31,

useful lives

                         2011 

             2010 

Office furniture and equipment

3 to 10 years

   $                 9,627 

   $      9,583 

Leasehold improvements

1 to 6 years

                      1,392 

           1,381 

Manufacturing and test equipment

2 to 10 years

                      2,590 

           2,417 

                    13,609 

         13,381 

Accumulated depreciation and amortization

                  (11,271)

       (10,416)

   Property and equipment, net

   $                 2,338 

   $      2,965 

 

Depreciation expense for the years ended December 31, 2011 and 2010 was $892 and $969, respectively.