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Stock Options and Warrants - Schedule of Stock Option Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, beginning balance (shares) 2,676,000 2,687,000  
Granted (shares) 50,000 67,000  
Cancelled (shares) (522,000) (78,000)  
Options outstanding, ending balance (shares) 2,204,000 2,676,000 2,687,000
Options exercisable at December 31, 2012 (shares) 1,942,000    
Range of exercise prices Granted (usd per share) $ 1.59    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, Weighted average exercise price per share, beginning balance (usd per share) $ 6.93 $ 7.19  
Granted, Weighted average exercise price per share (usd per share) $ 1.59 $ 2.23  
Cancelled, Weighted average exercise price per share (usd per share) $ 12.84 $ 19.88  
Options outstanding, Weighted average exercise price per share, ending balance (usd per share) $ 8.45 $ 6.93 $ 7.19
Options exercisable at December 31, 2012, Weighted average exercise price per share (usd per share) $ 5.79    
Options outstanding, Weighted average remaining contractual life 2 years 3 months 4 days 1 year 9 months 7 days 1 year 8 months 9 days
Granted, Weighted average remaining contractual life 4 years 10 months 6 days    
Options exercisable, Weighted average remaining contractual life 2 years 1 month 21 days    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Range of exercise prices Granted (usd per share)   $ 1.98  
Range of exercise prices Cancelled (usd per share) $ 4.71 $ 4.71  
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Range of exercise prices Granted (usd per share)   $ 2.97  
Range of exercise prices Cancelled (usd per share) $ 26.22 $ 42.75