XML 54 R39.htm IDEA: XBRL DOCUMENT
v3.19.1

Stock Plan (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 shares
Stock Plan [Abstract] |
Vesting period | 4 years
2013 Plan [Member] |
Stock Plan [Abstract] |
Shares available for grant (in shares) | 1,703,899
2013 Plan [Member] | Stock Options [Member] |
Stock Plan [Abstract] |
Vesting period | 4 years
Term of award | 10 years
2013 Plan [Member] | Stock Options [Member] | Named Executive Officers [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 100.00%
2013 Plan [Member] | Stock Options [Member] | 10% Shareholder [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 110.00%
2013 Plan [Member] | Incentive Stock Options [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 100.00%
2013 Plan [Member] | Nonqualified Stock Options [Member] | Minimum [Member] |
Stock Plan [Abstract] |
Exercise price of option granted as percentage of fair market value of shares at date of grant | 85.00%
2013 Plan [Member] | Restricted Stock Purchase Rights ("RSU") [Member] |
Stock Plan [Abstract] |
Vesting period | 4 years

X
- References No definition available. + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price of stock options granted as percentage of fair market value of shares at the date of grant. + References No definition available. + Details
Name: | vhc_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisePriceAsPercentageOfFairValue
Namespace Prefix: | vhc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=vhc_Plan2013Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_InvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=vhc_IncentiveStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=vhc_NonqualifiedStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |