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Shareholders' Equity Activity for stock options and warrants (Details) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
US Equity Plan [Member]
Dec. 31, 2011
US Equity Plan [Member]
Dec. 31, 2010
US Equity Plan [Member]
Jul. 22, 2011
Underwriting Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Class of Warrant or Right, Exercise Price of Warrants or Rights             1.45
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price       $ 1.29 $ 1.71 $ 1.66  
Common Stock Warrants, Shares 55,287,611 37,389,825 21,843,507        
Weighted Average Exercise Price, Warrants Outstanding 1.57 2.35 2.62        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       7,787,529 8,697,600    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price       $ 0.50 $ 1.50    
Stock Issued During Period, Shares, Warrant Inducements 419,690 670,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options and Non-Option Equity Instruments, Outstanding [Roll Forward]              
Stock Options, Outstanding at December 31, 2011       17,143,505 13,032,214    
Stock Options Exercised       0 (5,000)    
Stock Options Forfeited       (224,145) (3,364,120)    
Stock Options Expired       (3,020,209) (1,217,189)    
Stock Options, Outstanding at September 30, 2012       21,686,680 17,143,505    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price       $ 1.88 $ 1.82    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price       $ 1.66 $ 1.96    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price       $ 0 $ 1.42    
Warrants Granted 31,082,615 15,993,947          
Weighted Average Exercise Price, Warrants Granted $ 0.57 $ 2.09          
Warrants Exercised (11,076,182) 0          
Weighted Average Exercise Price, Warrants Exercised $ 0.60 $ 0          
Warrants Expired (790,003) (447,629)          
Weighted Average Exercise Price, Warrants Expired $ 2.17 $ 6.18          
Warrants Canceled (1,318,644) 0          
Weighted Average Exercise Price, Warrants Canceled $ 4.60 $ 0