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Fair Value Measurements (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Input
Derivative warrant liability [Abstract]    
Number of inputs used for valuation of warrants   6
Pre-tax derivative instrument expense $ 1,300,000 $ 1,100,000
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   200,000
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 expairations   (1,092,000)
Fair value of warrants exercised   (143,000)
Ending balance as of June 30, 2014 1,075,000 1,075,000
Recurring [Member] | Warrant liability [Member]
    
Liabilities [Abstract]    
Total Liabilities 1,075,000 1,075,000
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 1,075,000 1,075,000
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)   111.35%
Risk-free interest rates (in hundredths)   0.11%
Expected life (in years)   0 years 11 months 1 day
2013 Warrants [Member]
    
Derivative warrant liability [Abstract]    
Expected volatility (in hundredths)   94.18%
Risk-free interest rates (in hundredths)   1.34%
Expected life (in years)   4 years 3 months 29 days