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Goodwill and Intangibles Assets - Carrying Amount of Intangible Assets (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance |  | $ 4,943 |
Amortization expense |  | (248) | $ (248)
Intangible assets acquired in asset acquisition | $ 100 | 22 |
Foreign currency translation adjustment |  | (285) |
Ending balance |  | $ 4,432 |

X
- Definition Amortization expense + References No definition available. + Details
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Namespace Prefix: | kvhi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant