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Stock-Based Compensation (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-Based Compensation (Textual) [Abstract]        
Total unrecognized compensation cost $ 1,300,000   $ 1,300,000  
Weighted-average period for stock options     2 years 1 month  
Total compensation cost 270,000 248,000 877,511 1,150,272
Research and development expenses [Member]
       
Stock-Based Compensation (Textual) [Abstract]        
Total compensation cost 125,000 92,000 359,000 285,000
General and administrative expenses [Member]
       
Stock-Based Compensation (Textual) [Abstract]        
Total compensation cost 145,000 156,000 416,000 865,000
Employee and director stock options [Member]
       
Stock-Based Compensation (Textual) [Abstract]        
Weighted average grant date fair value per share $ 0.34 $ 0.73 $ 0.47 $ 0.79
Non-employees [Member]
       
Stock-Based Compensation (Textual) [Abstract]        
Total stock-based compensation for options granted to non-employees $ 5,000 $ (79,000) $ 102,000 $ 1,000