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Assets and Liabilities Measured at Fair Value (Details) (USD $)
 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 9 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2007
Sep. 30, 2012
Sep. 30, 2012
Recurring [Member]
Sep. 30, 2012
Recurring [Member]
Level 1 [Member]
Sep. 30, 2012
Recurring [Member]
Level 2 [Member]
Sep. 30, 2012
Recurring [Member]
Level 3 [Member]
Sep. 30, 2012
Recurring [Member]
Warrant Liability [Member]
Sep. 30, 2012
Recurring [Member]
Warrant Liability [Member]
Level 1 [Member]
Sep. 30, 2012
Recurring [Member]
Warrant Liability [Member]
Level 2 [Member]
Sep. 30, 2012
Recurring [Member]
Warrant Liability [Member]
Level 3 [Member]
Sep. 30, 2012
Recurring [Member]
Money Market Account [Member]
Sep. 30, 2012
Recurring [Member]
Money Market Account [Member]
Level 1 [Member]
Sep. 30, 2012
Recurring [Member]
Money Market Account [Member]
Level 2 [Member]
Sep. 30, 2012
Recurring [Member]
Money Market Account [Member]
Level 3 [Member]
May 31, 2012
2012 Warrants [Member]
Sep. 30, 2012
2012 Warrants [Member]
Sep. 30, 2007
2007 Warrants [Member]
Sep. 30, 2012
2007 Warrants [Member]
Jun. 30, 2009
2009 Warrants [Member]
Sep. 30, 2012
2009 Warrants [Member]
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 6,500,000                                    
Issuance of warrants to purchase common shares (in shares) 4,600,002                                 4,600,002 1,916,554     1,043,478
Proceeds from issuance of common stock $ 21,100,000 $ 2,700,000 $ 13,300,000 $ 14,600,000                         $ 3,400,000   $ 4,300,000   $ 2,200,000  
Exercise price of warrants (in dollars per share)                                 $ 1.65   $ 1.49   $ 1.33  
Expiration date of warrants                                     Sep. 21, 2012      
Warrants exercised                                       3.0    
Warrants outstanding (in shares)                                 4,600,002   3,392,592   1,043,478  
Gross proceeds from issuance of common stock 21,500,000 3,000,000                                        
Term of warrant                                 3 years       5 years  
Pre-tax derivative instrument expense       1,000,000                                    
Expected volatility (in hundredths)                                   83.54%       85.83%
Risk free interest rate (in hundredths)                                   0.28%       0.21%
Expected life                                   2 years 8 months 12 days       1 year 8 months 12 days
Assets [Abstract]                                            
Total Assets         1,967,000 1,967,000 0 0         1,967,000 1,967,000 0 0            
Liabilities [Abstract]                                            
Total Liabilities         4,561,000 0 0 4,561,000 4,561,000 0 0 4,561,000                    
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       (1,025,000)                                    
Fair value of warrants issued       4,055,000                                    
Fair value of warrants exercised or expired       (908,000)                                    
Ending balance       $ 4,561,000