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Commitments and Contingencies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract]      
Operating leases expenses $ 1,338,000 $ 1,046,000 $ 1,015,000
Stand by letter of credit amount   700,000  
Stand by letter of credit decreased 419,000    
Patent filling period of research affiliates maximum 8 years    
Patent filling period of research affiliates minimum 3 years    
Settlement payment from research affiliates 700,000    
Litigation, net 176,000 150,000  
Reimburse Amount 2,500,000    
Loss contingency net amount reimburse by insurance carrier 200,000    
Litigation expenses   $ 200,000  
Period in which office lease expires Jan. 01, 2014