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Stock based Compensation (Details) (USD $)
1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation   $ 519,218 $ 602,904
Total unrecognized compensation cost related to unvested stock options 1,400,000 1,400,000  
Period over which total unrecognized compensation cost related to unvested stock options will be recognized 2 years 4 months 10 days    
Weighted average grant date fair value per share   $ 0.40 $ 0.48
Non Employee [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation   69,000 98,000
Employees and Directors [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation   450,000 505,000
Employees and Directors [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate   0.40% 0.36%
Expected volatility   113.00% 132.00%
Expected life in years   4 years 4 years
Dividend yield   0.00% 0.00%
Forfeiture Rate   8.00% 10.00%
Research and Development Expense [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense   235,000 234,000
General and Administrative Expense [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated share-based compensation expense   $ 215,000 $ 271,000