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Litigation (Details) - Positive Outcome of Litigation [Member]	Oct. 13, 2017 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($) Patent	Jul. 29, 2016 Case	Mar. 11, 2016 USD ($) Patent	Feb. 04, 2016 USD ($) Patent	Mar. 30, 2015 Action	Feb. 26, 2013 USD ($)	Nov. 06, 2012 USD ($) Patent
VirnetX Inc. v. Apple, Inc. (Case 6:12-CV-00855-LED) [Member]
Gain Contingencies [Line Items]
Number of civil actions consolidated by court | Action							2
Amount of damages awarded in patent infringement case						$ 625,600,000
Number of patents allegedly infringed upon by Apple, Inc. | Patent						4
Number of cases ordered to be retried by court | Case				2
VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member]
Gain Contingencies [Line Items]
Number of civil actions consolidated by court | Action							2
Amount of damages awarded in patent infringement case	$ 439,700,000	$ 343,700,000	$ 302,400,000						$ 368,000,000
Number of patents allegedly infringed upon by Apple, Inc. | Patent			4						4
Number of cases ordered to be retried by court | Case				2
Amount of interest payment awarded up to final judgment, per day								$ 34,000
Amount of damage infringement payment awarded up to final judgment, per day								$ 330,000
Percentage of enhanced damages awarded during the willfulness period.		50.00%
Enhanced damages		$ 41,300,000
Additional amount granted in agreed bill of costs, attorney fees, and prejudgment interest	$ (96,000,000)
VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] | Minimum [Member]
Gain Contingencies [Line Items]
Royalty rate per device used in calculating infringement damages		1.20
VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] | Maximum [Member]
Gain Contingencies [Line Items]
Royalty rate per device used in calculating infringement damages		$ 1.80
VirnetX Inc. v. Apple, Inc. (Case 6:12-CV-00855-LED) ("Apple II") [Member]
Gain Contingencies [Line Items]
Number of civil actions consolidated by court | Action							2
Amount of damages awarded in patent infringement case					$ 502,600,000
Number of patents allegedly infringed upon by Apple, Inc. | Patent					4				4
Number of cases ordered to be retried by court | Case				2

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