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Litigation (Details)	Mar. 13, 2020 USD ($)	Sep. 20, 2018 USD ($)	Aug. 31, 2018 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($) Patent	Nov. 06, 2012 USD ($) Patent
VirnetX Inc. v. Apple, Inc. (Case 6:12-CV-00855-LED) ("Apple II") [Member]
Litigation [Abstract]
Amount of damages awarded in patent infringement case		$ 595,900,000	$ 502,600,000
Royalty rate per device used in calculating infringement damages			$ 1.2
Additional amount granted in agreed bill of costs, attorney fees, and prejudgment interest		$ 93,300,000
Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member]
Litigation [Abstract]
Amount of damages awarded in patent infringement case				$ 439,700,000	$ 302,400,000
Number of patents allegedly infringed upon by Apple, Inc. | Patent					4	4
Enhanced damages				41,300,000
Costs, fees and interest				96,000,000
Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] | Subsequent Event [Member]
Litigation [Abstract]
Amount of final judgment with interest received	$ 454,034,000
Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] | Minimum [Member]
Litigation [Abstract]
Amount of damages awarded in patent infringement case						$ 368,000,000
Royalty rate per device used in calculating infringement damages				1.20
Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member] | Maximum [Member]
Litigation [Abstract]
Royalty rate per device used in calculating infringement damages				$ 1.80

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