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Summary of Significant Accounting Policies (Details) shares in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) segment shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
PPP loan forgiveness |  | $ 6,979,000 |  | $ 6,979,000 | $ 0 |
Goodwill and intangible impairment charges |  |  | $ 10,490,000 | 0 | 10,490,000 |
Marketable securities |  |  | 25,141,000 | 13,147,000 | 25,141,000 |
Intangible asset impairment charge |  |  |  | 0 | 8,732,000 |
Deferred tax liability, intangible asset |  |  | 384,000 | 199,000 | 384,000 |
Goodwill, impairment loss |  |  |  | 0 | 1,758,000 |
Product warranty accrual |  |  | $ 1,812,000 | 1,179,000 | 1,812,000 | $ 2,194,000
Advertising expense |  |  |  | 1,259,000 | 1,285,000 |
Foreign currency exchange (gain) loss |  |  |  | $ 3,000 | $ 48,000 |
Antidilutive securities (in shares) | shares |  |  |  | 747 | 1,566 |
Number of operating segments | segment |  |  |  | 2 |  |
Mobile Broadband Reporting Unit |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Reporting unit, percent fair value in excess of carrying value | 18.00% |  |  |  |  |
KVH Media Group Reporting Unit |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Intangible asset impairment charge | $ 1,758,000 |  |  |  | $ 1,758,000 |
Fair value reporting unit | 10,156,000 |  |  |  |  |
Deferred tax liability, intangible asset | 334,000 |  |  |  |  |
Goodwill, impairment loss | $ 8,732,000 |  |  |  | $ 8,732,000 |
Revenue-generating assets |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 5 years |  |
Motor vehicles |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 5 years |  |
Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Limited product warranty period |  |  |  | 1 year |  |
Minimum | Building and improvements |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 5 years |  |
Minimum | Machinery, satellite hubs and equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 4 years |  |
Minimum | Office and computer equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Limited product warranty period |  |  |  | 2 years |  |
Maximum | Building and improvements |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 40 years |  |
Maximum | Machinery, satellite hubs and equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 10 years |  |
Maximum | Office and computer equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful lives |  |  |  | 7 years |  |

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