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v3.8.0.1

401(k) Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Defined contribution plan, employer matching contribution, percent of match | 50.00% |  |
Defined contribution plan, employer matching contribution, percent | 6.00% |  |
Defined contribution plan, vesting period | 5 years |  |
Defined contribution plan, employer matching contribution, amount | $ 683 | $ 671 | $ 608

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- Definition Defined Contribution Plan, Employer Matching Contribution, Amount + References No definition available. + Details
Name: | kvhi_DefinedContributionPlanEmployerMatchingContributionAmount
Namespace Prefix: | kvhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Contribution Plan, Vesting Period + References No definition available. + Details
Name: | kvhi_DefinedContributionPlanVestingPeriod
Namespace Prefix: | kvhi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration