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Goodwill and Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of future amortization expenses      
2013 $ 1,098    
2014 881    
2015 808    
2016 808    
2017 757    
Thereafter 3,554    
Net Carrying Amount 7,906     
Impairment of technology $ 1,000