Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 07, 2021
Cover [Abstract]
Entity Registrant Name	VirnetX Holding Corp
Entity Central Index Key	0001082324
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	001-33852
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0390628
Entity Address, Address Line One	308 Dorla Court
Entity Address, Address Line Two	Suite 206
Entity Address, City or Town	Zephyr Cove
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89448
City Area Code	775
Local Phone Number	548-1785
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	VHC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		71,058,570