Subsequent Events (Details)							1 Months Ended	16 Months Ended
	Oct. 26, 2017 Organization Employee	Oct. 16, 2017 USD ($)	Oct. 13, 2017 USD ($)	Sep. 29, 2017 USD ($)	Sep. 30, 2016 USD ($)	Nov. 06, 2012 USD ($)	Nov. 09, 2017 USD ($) $ / shares shares	Dec. 30, 2016 USD ($) $ / shares
ATM Agreement [Member]
Subsequent Event [Line Items]
Average sales price per common share (in dollars per share) | $ / shares								$ 4.14
Aggregate proceeds from sales of common stock								$ 23,169,000
Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member]
Subsequent Event [Line Items]
Amount of damages awarded in patent infringement case				$ 343,699,000	$ 302,400,000	$ 368,000,000
Subsequent Event [Member] | ATM Agreement [Member]
Subsequent Event [Line Items]
Number of shares of common stock sold (in shares) | shares							527,039
Average sales price per common share (in dollars per share) | $ / shares							$ 5.49
Aggregate proceeds from sales of common stock							$ 2,806
Sales commissions, fees and other costs associated with issuance of common stock							$ 87
Subsequent Event [Member] | Benefit One Solutions, Inc., Japan [Member]
Subsequent Event [Line Items]
Number of government and corporate organizations serviced | Organization	3,000
Number of employees | Employee	1,300
Subsequent Event [Member] | Positive Outcome of Litigation [Member] | VirnetX Inc. v. Cisco Systems, Inc. et al. (Case 6:10-CV-00417-LED) ("Apple I") [Member]
Subsequent Event [Line Items]
Royalty rate per device used in calculating infringement damages		$ 1.20
Amount of damages awarded in patent infringement case		$ 439,727,000	$ 439,727,000