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Fair Value Measurements (Narrative) (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Jul. 06, 2012
Jun. 30, 2012
Mar. 15, 2012
Dec. 31, 2011
Fair Value Measurements [Abstract]          
Warrant liability $ 1,012,000   $ 2,080,000    
Sensitivity analysis, percentage of price change 10.00%        
Sensitivity analysis, change in price of common stock, percentage 16.00%        
Sensitivity analysis, change in price of common stock, value 200,000        
Sensitivity analysis, percentage of volatility change 10.00%        
Sensitivity analysis, change in volatility, percentage 14.00%        
Sensitivity analysis, change in volatility, value 100,000        
Cash and cash equivalents, fair value 649,000       4,600,000
Outstanding letter of credit $ 1,400,000 $ 4,900,000   $ 3,000,000