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Stock-Based Compensation (Schedule of Restricted Stock Activity) (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Shares  
Unvested, beginning balance 2,899
Vested (2,899)
Unvested, ending balance   
Weighted- Average Grant Date Fair Value  
Unvested, beginning balance $ 2.23
Vested $ 2.09
Unvested, ending balance