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Goodwill and Intangible Assets, net (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Goodwill and Intangible Assets, net (Textual) [Abstract]          
Carrying amount of goodwill $ 1,316,000   $ 1,316,000   $ 1,316,000
Amortization expenses of intangible assets 51,000 51,000 101,000 101,000  
Impairment charges recognized related to the acquired intangible assets 0 0 0 0  
Annual amortization expense of the intangible assets, For remaining six months of 2012 100,000   100,000    
Annual amortization expense of the intangible assets, 2013 200,000   200,000    
Annual amortization expense of the intangible assets, 2014 200,000   200,000    
Annual amortization expense of the intangible assets, 2015 200,000   200,000    
Annual amortization expense of the intangible assets, 2016 200,000   200,000    
Annual amortization expense of the intangible assets, 2017 200,000   200,000    
Annual amortization expense of the intangible assets, 2018 200,000   200,000    
Annual amortization expense of the intangible assets, 2019 200,000   200,000    
Annual amortization expense of the intangible assets, 2020 $ 100,000   $ 100,000