Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jan. 01, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired				$ 47	$ 58
Amortization expense		$ 277	$ 251	$ 833	$ 740
KVH Media Group
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets						$ 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				$ 393
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