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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended	120 Months Ended
	Jan. 31, 2017	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2026
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 16	$ 22
Amortization expense		276
General and administrative
Finite-Lived Intangible Assets [Line Items]
Amortization expense		$ 276	$ 248
KVH Media Group Reporting Unit
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge				$ 1,758
Goodwill impairment charge				$ 8,732
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		7 years
Headland Media Limited | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		10 years
Headland Media Limited | Distribution rights
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives		1 year		15 years
Q1 2017 Acquisition
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 362
Q1 2017 Acquisition | Maximum | Forecast
Finite-Lived Intangible Assets [Line Items]
Contingent consideration, value, high					$ 114
Q1 2017 Acquisition | Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful lives	10 years
Finite-lived intangible assets acquired	$ 100

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Contingent Consideration from Acquisition, Annual Payment. Contingent consideration arising from an asset purchase agreement, resulting in an annual payment from the Company to the third party.

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