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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