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Assets and Liabilities Measured at Fair Value (Details) (USD $)
 1 Months Ended 6 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2007
Jun. 30, 2012
Dec. 31, 2011
Derivative warrant liability [Abstract]          
Number of inputs used for valuation of warrants       6  
Sale of common stock (in shares) 15,333,340 869,565 3,833,108 1,800,000  
Issuance of warrants to purchase common shares (in shares) 4,600,002 1,043,478 1,916,554    
Proceeds from issuance of common stock $ 21,100,000 $ 2,700,000 $ 13,300,000 $ 5,800,000  
Gross proceeds from issuance of common stock 21,500,000 3,000,000      
Pre-tax derivative instrument expense       600,000  
Warrant liability       5,915,000 2,439,000
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]          
Beginning balance       2,439,000  
Total change in the fair value of the liability included in earnings       (579,000)  
Fair value of warrants issued       4,055,000  
Ending balance       5,915,000  
Recurring [Member]
          
Assets [Abstract]          
Total Assets       5,785,000  
Liabilities [Abstract]          
Total Liabilities       5,915,000  
Recurring [Member] | Level 1 [Member]
          
Assets [Abstract]          
Total Assets       5,785,000  
Liabilities [Abstract]          
Total Liabilities       0  
Recurring [Member] | Level 2 [Member]
          
Assets [Abstract]          
Total Assets       0  
Liabilities [Abstract]          
Total Liabilities       0  
Recurring [Member] | Level 3 [Member]
          
Assets [Abstract]          
Total Assets       0  
Liabilities [Abstract]          
Total Liabilities       5,915,000  
Recurring [Member] | Warrant Liability [Member]
          
Liabilities [Abstract]          
Total Liabilities       5,915,000  
Recurring [Member] | Warrant Liability [Member] | Level 1 [Member]
          
Liabilities [Abstract]          
Total Liabilities       0  
Recurring [Member] | Warrant Liability [Member] | Level 2 [Member]
          
Liabilities [Abstract]          
Total Liabilities       0  
Recurring [Member] | Warrant Liability [Member] | Level 3 [Member]
          
Liabilities [Abstract]          
Total Liabilities       5,915,000  
Recurring [Member] | Money Market Account [Member]
          
Assets [Abstract]          
Total Assets       5,785,000  
Recurring [Member] | Money Market Account [Member] | Level 1 [Member]
          
Assets [Abstract]          
Total Assets       5,785,000  
Recurring [Member] | Money Market Account [Member] | Level 2 [Member]
          
Assets [Abstract]          
Total Assets       0  
Recurring [Member] | Money Market Account [Member] | Level 3 [Member]
          
Assets [Abstract]          
Total Assets       0  
2012 Warrants [Member]
          
Derivative warrant liability [Abstract]          
Proceeds from issuance of common stock 3,400,000        
Exercise price of warrants (in dollars per share) $ 1.65        
Warrants outstanding (in shares) 4,600,002        
Term of warrant 3 years        
Expected volatility (in hundredths)       81.01%  
Risk free interest rate (in hundredths)       0.41%  
Expected life       2 years 11 months  
2007 Warrants [Member]
          
Derivative warrant liability [Abstract]          
Proceeds from issuance of common stock     4,300,000    
Exercise price of warrants (in dollars per share)     $ 4.53 $ 1.49  
Minimum period after which warrants can be exercised     6 months    
Expiration date of warrants       Sep. 21, 2012  
Warrants outstanding (in shares)     3,392,592    
Expected volatility (in hundredths)       85.37%  
Risk free interest rate (in hundredths)       0.09%  
Expected life       2 months 26 days  
2009 Warrants [Member]
          
Derivative warrant liability [Abstract]          
Proceeds from issuance of common stock   $ 2,200,000      
Exercise price of warrants (in dollars per share)   $ 1.33      
Warrants outstanding (in shares)   1,043,478      
Term of warrant   5 years      
Expected volatility (in hundredths)       86.40%  
Risk free interest rate (in hundredths)       0.33%  
Expected life       1 year 11 months 16 days