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Deferred Revenue (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Deferred Revenue (Textual)    
Engineering development fees recorded as deferred revenue $ 2,594,000 $ 1,906,000
Description of deferred engineering development fees and deferred license fee revenue Deferred license fee revenue related to a prepayment for future license fees from one customer and a total of $0.3 million and $0.4 million, respectively, of deferred engineering development fees from six and four customers, respectively. We are deferring the engineering development fee revenue until such time as the engineering work has been completed.  
Future License Fees From One Customer [Member]
    
Deferred Revenue (Textual)    
Engineering development fees recorded as deferred revenue 2,300,000 1,500,000
Deferred Engineering Development Fees From Four Customers [Member]
    
Deferred Revenue (Textual)    
Deferred engineering development fees from second set of customers 300,000 300,000
Deferred engineering development fees from first set of customers $ 400,000 $ 400,000