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Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation     $ 1,338,427 $ 1,176,874
Total unrecognized compensation cost related to unvested stock options 1,200,000   1,200,000  
Period over which total unrecognized compensation cost related to unvested stock options will be recognized 1 year 11 months 6 days      
Weighted average grant date fair value per share $ 1.31 $ 0.44 $ 0.43 $ 0.47
Employees and Directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 250,000 253,000 920,000 1,000,000
Employees and Directors [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 0.68% 0.33% 0.40% 0.36%
Expected volatility 76.00% 129.00% 111.00% 131.00%
Expected life 4 years 4 years 4 years 4 years
Dividend yield 0.00% 0.00% 0.00% 0.00%
Forfeiture Rate 8.00% 8.00% 8.00% 8.00%
Non Employee [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 295,000 46,000 418,000 149,000
Research and Development Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 105,000 117,000 439,000 477,000
General and Administrative Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 145,000 $ 136,000 $ 481,000 $ 551,000