Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

Name:	us-gaap_OperatingLossCarryforwards
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Expiration date of each operating loss carryforward included in operating loss carryforward, in YYYY-MM-DD format.

Name:	us-gaap_OperatingLossCarryforwardsExpirationDate
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Data Type:	xbrli:dateItemType
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The amortization of capitalized direct and indirect research and development costs during the period.

No definition available.

Name:	vhc_AmortizationOfCapitalizedDirectAndIndirectResearchAndDevelopmentCosts
Namespace Prefix:	vhc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The amount of capitalized direct and indirect research and development costs.

No definition available.

Name:	vhc_CapitalizedDirectAndIndirectResearchAndDevelopmentCosts
Namespace Prefix:	vhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from capitalized direct and indirect research and development costs.

No definition available.

Name:	vhc_DeferredTaxAssetsCapitalizedDirectAndIndirectResearchAndDevelopmentCosts
Namespace Prefix:	vhc_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

The unamortized capitalized direct and indirect research and development costs.

No definition available.