Litigation (Details) - Positive Outcome of Litigation [Member]	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. 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
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
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
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		$ 1.20
Additional amount granted in agreed bill of costs, attorney fees, and prejudgment interest	$ 93,300,000