XML 39 R21.htm IDEA: XBRL DOCUMENT v3.19.3

Business Description and Basis of Presentation (Details) - Patents [Member]	Sep. 30, 2019 Patent
Business Description [Abstract]
Number of patents and pending applications	191
U.S. [Member]
Business Description [Abstract]
Number of patents and pending applications	75
Foreign [Member]
Business Description [Abstract]
Number of patents and pending applications	116

X

- References

No definition available.

+ Details

Name:	us-gaap_IntangibleAssetsGrossExcludingGoodwillAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents number of patents and pending applications owned by the entity.

+ References

No definition available.

+ Details

Name:	vhc_NumberOfPatentsAndPendingApplicationsOwned
Namespace Prefix:	vhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_GeographicDistributionAxis=us-gaap_NonUsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: