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Summary of Significant Accounting Policies (Details) (International Military Customer [Member], Defense Products [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
International Military Customer [Member] | Defense Products [Member]
      
Accounting Policies [Line Items]      
Revenue Recognition, Multiple-deliverable Arrangements, Contract Amount   $ 19,000kvhi_RevenueRecognitionMultipleDeliverableArrangementsContractAmount
/ us-gaap_MajorCustomersAxis
= kvhi_InternationalMilitaryCustomerMember
/ us-gaap_ProductOrServiceAxis
= kvhi_DefenseProductsMember		  
Contracts Revenue $ 300us-gaap_ContractsRevenue
/ us-gaap_MajorCustomersAxis
= kvhi_InternationalMilitaryCustomerMember
/ us-gaap_ProductOrServiceAxis
= kvhi_DefenseProductsMember		   $ 1,100us-gaap_ContractsRevenue
/ us-gaap_MajorCustomersAxis
= kvhi_InternationalMilitaryCustomerMember
/ us-gaap_ProductOrServiceAxis
= kvhi_DefenseProductsMember