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Deferred Revenue (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Deferred Revenue (Textual)    
Engineering development fees recorded as deferred revenue $ 1,543,000 $ 1,906,000
Deferred engineering development fees from second set of customers 100,000 100,000
Deferred engineering development fees from first set of customers 400,000 400,000
Future License Fees From One Customer [Member]
    
Deferred Revenue (Textual)    
Engineering development fees recorded as deferred revenue $ 1,400,000 $ 1,500,000