Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Details Textual)

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Common Stock (Details Textual) (USD $)
0 Months Ended 6 Months Ended 72 Months Ended
Jun. 27, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Common Stock (Textual) [Abstract]          
Shares issued for public offering under underwriting 5,750,000 24,375,749   24,375,749 18,604,245
Over-allotment option 750,000        
Proceed from option exercised by underwriters $ 5.00        
Proceeds from net of underwriting commissions and other offering expenses $ 26,500,000 $ 28,750,000 $ 80,000 $ 28,948,000  
Unrecognized stock-based compensation expense related to unvested stock options and warrants granted to employees and non-employees   5,700,000   5,700,000  
Unrecognized stock-based compensation expense, weighted average vesting period   1 year 9 months 18 days      
Declared a dividend for Series A Convertible Preferred Stock     2,178,917    
Fair value of the Common Stock   $ 5,900,000      
Fair value of the Common Stock per share   $ 2.69