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Warrant Liability (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Class of Warrant or Right [Line Items]          
Change in fair value of warrant liability $ 0 $ (863,000) $ 418,000 $ (1,244,000)  
Warrants [Member]
         
Class of Warrant or Right [Line Items]          
Fair value of warrants 0   0    
Change in fair value of warrant liability $ 0 $ 863,000 $ 418,000 $ 1,244,000  
Expected term          7 months 10 days
Common stock market price (in dollars per share) $ 0   $ 0   $ 2.80
Risk-free interest rate (in hundredths)     0.00%   0.11%
Expected volatility (in hundredths)     0.00%   73.88%
Resulting fair value (per warrant) (in dollars per share) $ 0   $ 0   $ 0.20