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Intangible Assets (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Intangible Assets (Textual) [Abstract]        
Amortization expense $ 141 $ 88 $ 298 $ 176
Minimum
       
Intangible Assets (Textual) [Abstract]        
Intangible assets, useful life     3 years  
Maximum
       
Intangible Assets (Textual) [Abstract]        
Intangible assets, useful life     5 years