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Stock Options (Details) | 12 Months Ended | 0 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 item | May 17, 2012 | May 19, 2011 | May 20, 2010 | May 21, 2009 | May 29, 2008 | May 30, 2007 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 22, 2005 | Dec. 31, 2001 | Dec. 31, 1995 | Mar. 17, 2005
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock-based compensation plans | 2 intz_NumberOfStockBasedCompensationPlans |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 3,076,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  |  |  | 3,045,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 2,779,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |
Common shares reserved for future issuance |  |  |  |  |  |  |  | 4,423,407 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |  |
Option exercisable period one | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Option exercisable period three | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Option exercisable period three | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Expiration term | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Expiration term for incentive stock options granted to holders of more than 10% of the entity's voting stock | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price as a percentage of the fair market value of common stock in case of optionees holding more than 10% of voting stock | 110.00%intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfExercisePriceOfCommonStockPercentageInCaseOfOptioneesHoldingMoreThanSpecifiedPercentageOfVotingStock / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Voting stock percentage to be held by optionees | 10.00%intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardVotingStockPercentageToBeHeldByOptionees / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |
PREFERRED STOCK |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares reserved for future issuance | 1,067,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
1995 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  |  |  |  |  |  | 825,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member |
Shares available for future grant |  |  |  |  |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member |  |  |
Options exercised (in shares) | 67,365 intz_AggregateStockOptionsExercisedForThePlan / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 138,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member |  |  |  |  |  |  |  |  |  |  |  |
Common shares reserved for future issuance | 139,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = intz_StockOptionPlan1995Member |  |  |  |  |  |  |  |  |  |  |  |
2005 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  | 3,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 3,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 2,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  | 1,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member
Shares available for future grant | 280,164 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Additional increase in number of shares available for issuance |  | 300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |
Number of separate equity incentive programs | 3 intz_NumberOfEquityIncentivePrograms / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Options exercised (in shares) | 482,835 intz_AggregateStockOptionsExercisedForThePlan / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 2,937,001 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | 3,852,000 intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsAggregate / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Options cancelled (in shares) | 432,164 intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAggregate / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to the Stock Issuance Program | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
Common shares reserved for future issuance | 3,217,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member |  |  |  |  |  |  |  |  |  |  |  |
2005 Plan | Non-employee Board member |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Options that will be granted upon initial election or appointment to the Board (in shares) | 10,000 intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsThatWillBeGrantedUponInitialElectionOrAppointmentToBoard / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member / us-gaap_TitleOfIndividualAxis = intz_NonEmployeeBoardMember |  |  |  |  |  |  |  |  |  |  |  |
Preceding period within which individual has not previously been employed by the company | 6 months |  |  |  |  |  |  |  |  |  |  |  |
Options that will be granted to purchase shares of common stock on the date of each annual stockholders meeting | 5,000 intz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionThatWillBeGrantedToPurchaseSharesOnDateOfEachAnnualStockholdersMeeting / us-gaap_PlanNameAxis = intz_StockIncentivePlan2005Member / us-gaap_TitleOfIndividualAxis = intz_NonEmployeeBoardMember |  |  |  |  |  |  |  |  |  |  |  |
Period for which individual should serve as a non-employee Board member | 6 months |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the percentage of voting stock to be held by optionees for entitlement to exercise price less than the specified percentage of the fair market value of common stock. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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