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Fair Value Measurements (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Input
Derivative warrant liability [Abstract]    
Number of inputs used for valuation of warrants   6
Pre Tax Derivative Instrument Income $ 500,000 $ 1,600,000
Hypothetical change in market price of common shares (in hundredths)   10.00%
Impact of the hypothetical change in market price of common shares on derivative liability   100,000
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance as of December 31, 2013   2,310,000
Total change in the fair value of the liability included in earnings, including warrant expirations   (1,612,000)
Fair value of warrants exercised   (143,000)
Ending balance as of September 30, 2014 555,000 555,000
Recurring [Member] | Warrant liability [Member]
    
Liabilities [Abstract]    
Total Liabilities 555,000 555,000
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 555,000 555,000
Recurring [Member] | Money market funds [Member]
    
Assets [Abstract]    
Total Assets 1,945,000 1,945,000
Recurring [Member] | Money market funds [Member] | Level 1 [Member]
    
Assets [Abstract]    
Total Assets 1,945,000 1,945,000
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
2012 Warrants [Member]
    
Derivative warrant liability [Abstract]    
Expected volatility (in hundredths)   77.31%
Risk-free interest rates (in hundredths)   0.08%
Expected life (in years)   0 years 8 months 1 day
2013 Warrants [Member]
    
Derivative warrant liability [Abstract]    
Expected volatility (in hundredths)   90.32%
Risk-free interest rates (in hundredths)   1.43%
Expected life (in years)   4 years 0 months 29 days