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Segment Reporting - Net Sales and Operating Income (Loss) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]                    
Net sales                 $ 158,733,000 $ 157,893,000
Operating income (loss) $ (11,350,000) $ (503,000) $ (3,436,000) $ (7,648,000) $ (3,325,000) $ (4,858,000) $ (6,679,000) $ (6,234,000) (22,937,000) (21,096,000)
Net interest and other income                 1,171,000 1,084,000
Loss from continuing operations before income tax expense (benefit)                 (21,766,000) (20,012,000)
Impairment charge to goodwill and intangibles $ 10,490,000               10,490,000 0
KVH Media Group Reporting Unit                    
Segment Reporting Information [Line Items]                    
Impairment charge to goodwill and intangibles                 10,490,000  
Operating Segments                    
Segment Reporting Information [Line Items]                    
Operating income (loss)                 (5,272,000) (2,608,000)
Operating Segments | Mobile Connectivity                    
Segment Reporting Information [Line Items]                    
Net sales                 119,453,000 122,015,000
Operating income (loss)                 (10,071,000) (5,569,000)
Operating Segments | Intertial Navigation                    
Segment Reporting Information [Line Items]                    
Net sales                 39,280,000 35,878,000
Operating income (loss)                 4,799,000 2,961,000
Unallocated, net                    
Segment Reporting Information [Line Items]                    
Operating income (loss)                 $ (17,665,000) $ (18,488,000)