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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 12, 2018
USD ($)
Patent
Apr. 10, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
ATM Agreement [Member] | Common Stock [Member]      
Subsequent Event [Line Items]      
Number of shares of common stock sold (in shares) | shares     1,751,689
Average sales price per common share (in dollars per share) | $ / shares     $ 4.02
Aggregate proceeds from sales of common stock     $ 7,042
Sales commissions, fees and other costs associated with issuance of common stock     $ 212
Subsequent Event [Member] | VirnetX Inc. v. Apple, Inc. (Case 6:12-CV-00855-LED) ("Apple II") [Member]      
Subsequent Event [Line Items]      
Amount of damages awarded in patent infringement case $ 502,600    
Number of patents allegedly infringed upon by Apple, Inc. | Patent 4    
Subsequent Event [Member] | ATM Agreement [Member] | Common Stock [Member]      
Subsequent Event [Line Items]      
Number of shares of common stock sold (in shares) | shares   622,448  
Average sales price per common share (in dollars per share) | $ / shares   $ 4.07  
Aggregate proceeds from sales of common stock   $ 2,531  
Sales commissions, fees and other costs associated with issuance of common stock   $ 76