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Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Customer
Dec. 31, 2011
Customer
Deferred Revenue (Textual)    
Deferred fees $ 2,725 $ 1,906
Prepayments from future license fees [Member]
    
Deferred Revenue (Textual)    
Deferred fees 2,100 1,500
Number of customer 3 1
Deferred engineering development fees [Member]
    
Deferred Revenue (Textual)    
Deferred fees $ 600 $ 400
Number of customer 13 4