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Stock-Based Compensation (Details 1) (Stock Options [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of all stock option plans / warrant activity      
Weighted Average Number of Shares/Warrants, Outstanding, Beginning Balance 1,715,200 19,324 19,804
Weighted Average Number of Shares, Granted 145,000 1,704,000   
Weighted Average Number of Shares, Cancelled or expired (18,256) (8,124) (480)
Weighted Average Number of Shares, Exercised (241,361)      
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance 1,600,583 1,715,200 19,324
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 5.04 $ 92.19 $ 101.36
Weighted Average Exercise Price, Granted $ 6.06 $ 4.35   
Weighted Average Exercise Price, Expired $ 5.57 $ 69.36 $ 523.23
Weighted Average Exercise Price, Exercised $ 4.39      
Weighted Average Exercise Price, Outstanding, Ending Balance $ 5.22 $ 5.04 $ 92.19
Minimum [Member]
      
Summary of all stock option plans / warrant activity      
Exercise price per share, Outstanding, Beginning Balance $ 4.02 $ 35.39 $ 35.39
Stock Option Plans, Exercise Price Per Share Granted $ 5.54 $ 4.02   
Stock Option Plans, Exercise Price Per Share Cancelled or expired $ 4.25 $ 35.39 $ 135.00
Stock Option Plans, Exercise Price Per Share Exercised $ 4.25      
Exercise price per share, Outstanding, Ending Balance $ 4.02 $ 4.02 $ 35.39
Maximum [Member]
      
Summary of all stock option plans / warrant activity      
Exercise price per share, Outstanding, Beginning Balance $ 125.00 $ 368.75 $ 687.50
Stock Option Plans, Exercise Price Per Share Granted $ 7.70 $ 6.28   
Stock Option Plans, Exercise Price Per Share Cancelled or expired $ 125.00 $ 368.75 $ 687.50
Stock Option Plans, Exercise Price Per Share Exercised $ 6.28      
Exercise price per share, Outstanding, Ending Balance $ 122.50 $ 125.00 $ 368.75