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Stock-Based Compensation (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation       $ 793,864 $ 877,511
Total unrecognized compensation cost related to unvested stock options   1,300,000   1,300,000  
Period over which total unrecognized compensation cost related to unvested stock options will be recognized 2 years 1 month 6 days        
Weighted average grant date fair value per share   $ 0.48 $ 0.34 $ 0.40 $ 0.47
Non Employee [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   54,000 5,000 124,000 102,000
Employees and Directors [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   220,000 270,000 670,000 775,000
Employees and Directors [Member] | Stock Options [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Risk-free interest rate   0.34% 0.32% 0.40% 0.37%
Expected volatility   108.00% 122.00% 112.00% 131.00%
Expected life   4 years 3 years 6 months 4 years 4 years
Dividend yield   0.00% 0.00% 0.00% 0.00%
Forfeiture Rate   8.00% 8.00% 8.00% 8.00%
Research and Development Expense [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated share-based compensation expense   100,000 125,000 334,000 359,000
General and Administrative Expense [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated share-based compensation expense   $ 120,000 $ 145,000 $ 336,000 $ 416,000