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Litigation (Details) | Sep. 20, 2018 USD ($) | Aug. 31, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 30, 2016 USD ($) Patent | Nov. 06, 2012 USD ($) Patent
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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] | 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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