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Concentrations (Details) (Total revenues, Customer)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
U.S. Government
    
Concentrations    
Percentage of revenue 64.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_UnitedStatesGovernmentMember		 47.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_UnitedStatesGovernmentMember
Two individual commercial customers
    
Concentrations    
Percentage of revenue 23.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_TwoIndividualCommercialCustomersMember		 51.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_TwoIndividualCommercialCustomersMember
Number of customers 2intz_NumberOfMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_TwoIndividualCommercialCustomersMember		 2intz_NumberOfMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_TwoIndividualCommercialCustomersMember
Three government customers
    
Concentrations    
Percentage of revenue 48.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_ThreeGovernmentCustomerMember		 34.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_ThreeGovernmentCustomerMember
Number of customers 3intz_NumberOfMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_ThreeGovernmentCustomerMember		 3intz_NumberOfMajorCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= intz_RevenuesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= intz_ThreeGovernmentCustomerMember