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Stock Plan (Details) (USD $)
Apr. 13, 2012
Mar. 31, 2012
Dec. 31, 2011
VirnetX Holding Corporation 2007 Stock Plan [Line Items]      
Number of shares authorized (in shares)   11,624,469  
Shares available for grant (in shares)   628,478  
Stock Options [Member]
     
VirnetX Holding Corporation 2007 Stock Plan [Line Items]      
Number of shares authorized (in shares) 240,000    
Stock options outstanding (in shares)   4,828,998 4,906,998
Average exercise price (in dollars per share)   $ 5.20 $ 5.12