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Stock-Based Compensation (Details 5) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Warrants, Beginning Balance 1,632,501 3,259,186
Number of Warrants, Granted 0 985,855
Number of Warrants, Exercised 0 (1,768,167)
Number of Warrants, Forfeited 0 (844,373)
Number of Warrants, Ending Balance 1,632,501 1,632,501
Weighted Average Exercise Price, Beginning Balance $ 1.99 $ 1.95
Weighted Average Exercise Price, Granted $ 0 $ 1.71
Weighted Average Exercise Price, Exercised $ 0 $ 1.11
Weighted Average Exercise Price, Forfeited $ 0 $ 3.32
Weighted Average Exercise Price, Ending Balance $ 1.99 $ 1.99