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Stockholders' Equity (Details Textual) (USD $)
 6 Months Ended 0 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
May 31, 2013
Apr. 30, 2013
Dec. 31, 2012
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Jun. 30, 2013
Stock and Cash Based Incentive Plan [Member]
Jun. 30, 2013
Amended 2000 Stock Option Plan [Member]
Apr. 30, 2013
Common Stock Warrants [Member]
Mar. 31, 2013
Common Stock Warrants [Member]
Aug. 31, 2012
Common Stock Warrants [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Jun. 30, 2013
Underwritten public offering [Member]
Jun. 30, 2013
Underwritten public offering [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2012
Sales Agreement [Member]
Jun. 30, 2013
VGX Equity Compensation Plan [Member]
Stockholders' Equity (Textual) [Abstract]                                  
Common stock, shares authorized 600,000,000 300,000,000 600,000,000 300,000,000                          
Common stock, capital shares reserved for future issuance                       27,377,266          
Common stock purchase warrant                       13,688,633          
Purchase price per unit of common stock and warrant                       0.55          
Class of warrant or right, number of securities called by each warrant or right                       0.50          
Class of warrant or right, securities called by warrants or rights, price per share                       $ 0.7936          
Term of the warrants in years                       5 years 6 months          
Potential proceeds from issue of common stock                       $ 14,000,000          
Warrants, Fair Value Disclosure                       6,000,000          
Increase in fair value of warrants                         2,500,000.0 3,100,000.0      
Transaction costs associated with issuance of warrants 315,970 0                              
Potential proceeds from sale of common stock through placement agent for resale                             25,000,000.0    
Rate of commission or discount to placement agent                             3.00%    
Common stock sold under sales agreement 8,222,966                             9,344,611  
Weighted average price per share on sale of common stock $ 0.70       $ 0.59                        
Proceeds from issuance of common stock and warrants $ 5,600,000                             $ 5,300,000  
Warrants expired to purchase number of shares of common stock                 1,963 54,948 150,000            
Number of additional shares authorized           2,000,000                      
Number of potential shares authorized for issuance under share based compensation plan           2,055,331                      
Number of shares authorized             11,915,993                    
Number of shares available for grant             1,289,493                    
Number of shares of vested restricted stock outstanding under plan             240,000                    
Common stock, other shares, outstanding             10,063,287                    
Award vesting period 3 years                                
Maximum contractual term 10 years                                
Options, outstanding, number               1,276,435                 7,058,240