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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