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Property, Plant and Equipment
6 Months Ended
Jun. 30, 2011
Property, Plant and Equipment and Asset Held for Sale [Abstract]  
Property, Plant and Equipment
7. Property, Plant and Equipment
     Property, plant and equipment consisted of the following (in thousands):
                 
    June 30, 2011     December 31, 2010  
Plant and machinery
  $ 727     $ 686  
Furniture, fixtures and equipment
    351       351  
Computers and software
    1,460       1,437  
Trucks
    118       118  
Leasehold improvements
    406       402  
     
Total cost
    3,062       2,994  
Less: accumulated depreciation
    (2,297 )     (2,079 )
     
 
  $ 765     $ 915  
     
     Depreciation expense for the three months ended June 30, 2011 and 2010 was $67,000 and $140,000, respectively. Depreciation for the six months ended June 30, 2011 and 2010 was $127,000 and $314,000, respectively.