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Summary of Significant Accounting Policies (Details Textual) shares in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | May 13, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) segment shares | Dec. 31, 2019 USD ($) shares | Jun. 04, 2019 | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Goodwill and intangible impairment charges |  |  |  | $ 10,490,000 | $ 10,490,000 | $ 0 |  |  |
Marketable securities |  |  | $ 29,907,000 | 25,141,000 | 25,141,000 | 29,907,000 |  |  |
Right of use assets |  |  | 6,286,000 | 6,893,000 | 6,893,000 | 6,286,000 |  |  |
Lease liabilities |  |  |  | 7,030,000 | 7,030,000 |  |  |  |
Intangible asset impairment charge |  |  |  |  | 1,758,000 | 0 |  |  |
Deferred tax liability, intangible asset |  |  | 844,000 | 384,000 | 384,000 | 844,000 |  |  |
Goodwill, Impairment Loss |  |  |  |  | 8,732,000 | 0 |  |  |
Intangible assets and goodwill | $ 8,846,000 |  |  |  |  |  |  |  |
Product warranty accrual |  |  | 2,194,000 | $ 1,812,000 | 1,812,000 | 2,194,000 |  |  | $ 1,916,000
Advertising expense |  |  |  |  | 1,285,000 | 2,290,000 |  |  |
Foreign currency exchange (gain) loss |  |  |  |  | $ 48,000 | $ 181,000 |  |  |
Antidilutive securities (in shares) | shares |  |  |  |  | 1,566 | 1,209 |  |  |
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] |  |  |  |  |  |  |  |  |
Goodwill and intangible impairment charges |  |  |  |  | $ 10,490,000 |  |  |  |
Fair value reporting unit | $ 10,156,000 |  |  |  |  |  |  |  |
Intangible asset impairment charge | 1,758,000 |  |  |  |  |  |  |  |
Deferred tax liability, intangible asset | 334,000 |  |  |  |  |  |  |  |
Goodwill, Impairment Loss | 8,732,000 |  |  |  |  |  |  |  |
Intangible assets and goodwill | $ 4,445,000 |  |  |  |  |  |  |  |
Revenue-generating assets |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 5 years |  |  |  |
Motor vehicles |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Useful lives |  |  |  |  | 5 years |  |  |  |
Bridge Loan | Oakley |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Effective interest rate |  | 5.00% |  |  |  |  | 12.00% |  |
Videotel | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Sale of business |  | $ 89,387,000 | $ 88,447,000 |  |  |  |  |  |
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 |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Right of use assets |  |  |  |  |  |  |  | $ 10,469,000 |
Lease liabilities |  |  |  |  |  |  |  | $ 10,469,000 |

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