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Stock-Based Compensation (Details 4) (Warrant [Member], USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Warrant [Member]
      
Summary of all stock option plans / warrant activity      
Weighted Average Number of Shares/Warrants, Outstanding, Beginning Balance 5,405,606 5,139,489  
Warrants, Issued    809,543  
Warrants, Expired (232)    
Common stock issued upon exercise of warrants, Shares (700,738) (543,426)  
Weighted Average Number of Shares/Warrants, Outstanding, Ending Balance 4,704,636 5,405,606 5,139,489
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 1.57 $ 1.27  
Weighted Average Exercise Price, Issued    $ 3.08  
Weighted Average Exercise Price, Expired/forfeited $ 31.75     
Weighted Average Exercise Price, Exercised $ 1.18 $ 1.04  
Weighted Average Exercise Price, Outstanding, Ending Balance $ 1.61 $ 1.57 $ 1.27
Weighted Average Remaining Contractual Life (years) Options Outstanding 1 year 4 months 27 days 2 years 5 months 12 days 3 years 2 months 22 days
Weighted Average Remaining Contractual Life, Issued        
Weighted Average Remaining Contractual Life, Expired and forfeited        
Weighted Average Remaining Contractual Life, Exercised