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Stockholders' Equity (Details Textual) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
May 14, 2010
Stock and Cash Based Incentive Plan [Member]
Mar. 31, 2013
Stock and Cash Based Incentive Plan [Member]
Mar. 31, 2013
Amended 2000 Stock Option Plan [Member]
Mar. 31, 2013
Common Stock Warrants [Member]
Aug. 31, 2012
Common Stock Warrants [Member]
Jun. 30, 2012
Sales Agreement [Member]
Dec. 31, 2012
Sales Agreement [Member]
Mar. 07, 2013
Underwritten public offering [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Mar. 31, 2013
Underwritten public offering [Member]
Mar. 31, 2013
VGX Equity Compensation Plan [Member]
Stockholders' Equity (Textual) [Abstract]                            
Common stock, capital shares reserved for future issuance                       27,377,266 27,377,266  
Common stock purchase warrant                       13,688,633 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 0.50  
Class of warrant or right, securities called by warrants or rights, price per share                       $ 0.7936 $ 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 6,000,000  
Increase in fair value of warrants                         657,000  
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             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         1,353,868                  
Number of shares of vested restricted stock outstanding under plan         240,000                  
Common stock, other shares, outstanding         9,998,912                  
Award vesting period 3 years                          
Maximum contractual term 10 years                          
Options, outstanding, number           1,276,435               7,218,176