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Assets and Liabilities Measured at Fair Value (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2013
Sep. 30, 2013
Input
Derivative warrant liability [Abstract]        
Number of inputs used for valuation of warrants       6
Sale of common stock (in shares) 15.3 0.9    
Issuance of warrants to purchase common shares (in shares) 4.6 1.0    
Gross proceeds from issuance of common stock $ 21,500,000 $ 3,000,000    
Proceeds from issuance of common stock 21,100,000 2,700,000    
Pre-tax derivative instrument income     500,000  
Pre-tax derivative instrument expense       2,300,000
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]        
Beginning balance as of December 31, 2012       3,427,000
Total change in the fair value of the liability included in earnings       (2,345,000)
Fair value of warrants exercised       (219,000)
Ending balance as of September 30, 2013     863,000 863,000
Recurring [Member] | Warrant liability [Member]
        
Liabilities [Abstract]        
Total Liabilities     863,000 863,000
Recurring [Member] | Warrant liability [Member] | Level 1 [Member]
        
Liabilities [Abstract]        
Total Liabilities     0 0
Recurring [Member] | Warrant liability [Member] | Level 2 [Member]
        
Liabilities [Abstract]        
Total Liabilities     0 0
Recurring [Member] | Warrant liability [Member] | Level 3 [Member]
        
Liabilities [Abstract]        
Total Liabilities     863,000 863,000
Recurring [Member] | Money market funds [Member]
        
Assets [Abstract]        
Total Assets     1,956,000 1,956,000
Recurring [Member] | Money market funds [Member] | Level 1 [Member]
        
Assets [Abstract]        
Total Assets     1,956,000 1,956,000
Recurring [Member] | Money market funds [Member] | Level 2 [Member]
        
Assets [Abstract]        
Total Assets     0 0
Recurring [Member] | Money market funds [Member] | Level 3 [Member]
        
Assets [Abstract]        
Total Assets     0 0
2009 Warrants [Member]
        
Derivative warrant liability [Abstract]        
Proceeds from issuance of common stock   2,200,000    
Exercise price of warrants (in dollars per share)     $ 0.29 $ 0.29
Warrants outstanding (in shares)     1.0 1.0
Term of warrant   5 years    
Expected volatility (in hundredths)       105.91%
Risk-free interest rates (in hundredths)       0.07%
Expected life       9 months
2012 Warrants [Member]
        
Derivative warrant liability [Abstract]        
Proceeds from issuance of common stock $ 3,400,000      
Exercise price of warrants (in dollars per share)     $ 0.29 $ 0.29
Warrants outstanding (in shares)     4.4 4.4
Term of warrant 3 years      
Expected volatility (in hundredths)       93.89%
Risk-free interest rates (in hundredths)       0.27%
Expected life       1 year 9 months