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Stockholders' Equity (Details Textual) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jan. 31, 2011
Jan. 31, 2012
Stock and Cash Based Incentive Plan [Member]
May 31, 2010
Stock and Cash Based Incentive Plan [Member]
Jun. 30, 2012
Stock and Cash Based Incentive Plan [Member]
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Sep. 30, 2011
Amended 2000 Stock Option Plan [Member]
Oct. 31, 2011
Common Stock Warrants [Member]
Jun. 30, 2012
Maximum [Member]
Jun. 30, 2012
Minimum [Member]
Jan. 31, 2011
Investor purchase agreements [Member]
Jun. 30, 2012
Investor purchase agreements [Member]
Jun. 30, 2012
Investor purchase agreements [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2011
Underwritten public offering [Member]
Jun. 30, 2012
Underwritten public offering [Member]
Jun. 30, 2012
Underwritten public offering [Member]
Dec. 31, 2011
Overallotment option [Member]
Jun. 30, 2012
VGX Equity Compensation Plan [Member]
Stockholders' Equity (Textual) [Abstract]                                        
Potential sales proceeds                             $ 25,000,000          
Rate of commission or discount rate to placement agent                             3.00%          
Common stock shares issued                       21,130,400     0 7,699,712     962,465  
Warrants to purchase number of shares of common stock 21,743,844 21,743,847                   10,565,200       5,774,784        
Exercise Price     1.40                         0.65        
Aggregate amount of shares to be purchased under securities purchase agreement                       24,300,000                
Ratio to determine the number of warrants received per one share of common stock sold                       0.5       0.75        
Purchase price per unit of common stock and warrant                       $ 1.15       $ 0.5195        
Term of the warrants in years                       5 years       5 years        
First exercisable date from the date of issuance in days                       180 days                
Closing bid price of warrants, minimum                       $ 2.8       $ 1.3        
Trading date of warrants in days                       20 days       20 days        
Net proceeds from the transaction                       23,000,000       3,700,000        
Change in fair value of warrants                         $ (2,200,000) $ (211,000)     $ (1,200,000) $ 115,000    
Increased aggregate number of shares available for grants under the Incentive Plan 1,915,537           2,000,000                          
Warrants expired to purchase number of shares of common stock                 2,364,394                      
Number of potential shares authorized for issuance under a share-based compensation plan         2,055,331                              
Increased number of securities available for future issuance       2,055,331                                
Reserved number of shares under the Incentive Plan           9,860,662                            
Number of shares of vested restricted stock outstanding under the plan           240,000                            
Number of common stock outstanding under the Incentive Plan           7,389,912                            
Vesting period of Incentive Plan                     3 years                  
Contractual year term of Incentive Plan                   10 years                    
Number of options outstanding to purchase common stock               1,456,434                       7,577,516