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Additional Paid-In Capital (Summary Of Warrant Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Additional Paid-In Capital [Abstract]      
Warrants outstanding (in shares) 19,977,743 15,850,238 16,138,480
Warrants exercised (in shares) (619,565) (88,242)  
Warrants issued (in shares) 4,757,941    
Warrants expired (in shares) (10,871)    
Convertible notes broker warrants expired (in shares)   (200,000)  
Warrants valuation $ 12,936 $ 10,288 $ 10,721
Warrants valuation, exercised (601) (97)  
Warrants valuation, issued 3,260    
Warrants expired in period (11)    
Convertible notes broker warrants expired   (336)  
Weighted average exercise price per share $ 4.25 $ 3.91 $ 3.48
Weighted average remaining life (yrs.) 2 years 7 months 3 years 8 months 4 years 7 months
Intrinsic value   $ 485 $ 57