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Summary of Significant Accounting Policies - Leases (Details)	Jun. 30, 2025	Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Operating lease discount rate using risk-free rate	7.50%	8.50%

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- Definition

Discount rate used by lessee to determine present value of operating lease payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	vhc_SignificantAccountingPoliciesLineItems
Namespace Prefix:	vhc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration