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Fair Value Measurements (Narrative) (Details) (USD $)
3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Warrants Issued December 29, 2008 [Member]
Dec. 31, 2013
Warrants Issued December 29, 2008 [Member]
Mar. 31, 2014
Common Stock Closes Above $15.00 [Member]
Mar. 31, 2014
Common Stock Closes Above $20.00 [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member]
Dec. 29, 2008
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Warrants Issued December 29, 2008 [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Warrants Issued December 29, 2008 [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Black-Scholes Model Used to Value Warrants [Member]
Warrants Issued December 29, 2008 [Member]
Aug. 07, 2013
Exchange Warrants [Member]
Mar. 31, 2014
Exchange Warrants [Member]
Black-Scholes Model Used to Value Warrants [Member]
Aug. 07, 2013
Exchange Warrants [Member]
Monte-Carlo Simulation Used To Value Derivative Assets And Liabilities [Member]
Mar. 31, 2014
PIPE Warrants [Member]
Black-Scholes Model Used to Value Warrants [Member]
Fair Value Measurements [Line Items]                                
Cash equivalents invested in money market funds $ 8,970,282 $ 11,995,481         $ 8,970,282 $ 11,995,481                
Issued warrants to purchase shares of common stock 2,863,074               179,241       2,500,000      
Fair value of warrants issued     597 16,863           597 16,863 597        
Dividend yield                       0.00%        
Volatility rate                       88.68%   146.43% 111.00% 154.24%
Risk-free interest rate                       0.90%   1.73% 1.46% 1.73%
Expected life                       3 months        
Closing stock price                           $ 4.25 $ 8.69 $ 4.25
Mandatory conversion percentage per Debentures agreement         50.00% 100.00%                    
Share price which determines conversion per Debentures agreement         15.00 20.00                    
Number of consecutive trading days required at stock price         20 days 20 days                    
Mandatory conversion minimum per Debentures agreement         $ 2,500,000 $ 2,500,000