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Preferred Stock (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 25, 2004 item | Mar. 28, 2005 | Dec. 02, 2005
Dividends Payable |  |  |  |  |
Preferred stock dividends accrued during the period | $ 141,000 us-gaap_PreferredStockDividendsIncomeStatementImpact | $ 151,000 us-gaap_PreferredStockDividendsIncomeStatementImpact |  |  |
Accrued and unpaid dividends | 20,000 us-gaap_DividendsPayableCurrent | 437,000 us-gaap_DividendsPayableCurrent |  |  |
Series 1 |  |  |  |  |
Preferred Stock |  |  |  |  |
Dividend rate (as a percent) |  |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Value of shares issued under private placement |  |  | 5,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Shares issued under private placement |  |  | 1,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Share issued price (in dollars per share) |  |  | $ 5.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Issuance costs incurred for shares issued |  |  | 275,000 intz_PreferredStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Shares of common stock issued upon conversion of preferred stock | 318,065 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  | 1,590,331 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Conversion price per share (in dollars per share) |  |  | $ 3.144 intz_PreferredStockConversionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Number of votes per share that holders of preferred stock will receive |  |  | 1.5903 intz_PreferredStockVotingRightsNumber / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Liquidation preference value preferred stock price per share | $ 1,013 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 1,251 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 5.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Redemption price per share (in dollars per share) |  |  | $ 5.00 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Shares outstanding | 200,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 220,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |
Dividends Payable |  |  |  |  |
Preferred stock dividends accrued during the period | 51,000 us-gaap_PreferredStockDividendsIncomeStatementImpact / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |  |  |
Series 1 | G. Ward Paxton, chief executive officer |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  | 140,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_ChiefExecutiveOfficerMember |  |
Series 1 | Director |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  | 60,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_DirectorMember |  |
Series 2 |  |  |  |  |
Preferred Stock |  |  |  |  |
Dividend rate (as a percent) |  |  |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Value of shares issued under private placement |  |  |  | 2,700,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Shares issued under private placement |  |  |  | 1,065,200 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Share issued price (in dollars per share) |  |  |  | $ 2.50 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Issuance costs incurred for shares issued |  |  |  | 173,000 intz_PreferredStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Shares of common stock issued upon conversion of preferred stock | 460,000 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 1,065,200 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Conversion price per share (in dollars per share) |  |  |  | $ 2.50 intz_PreferredStockConversionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Liquidation preference value preferred stock price per share | $ 1,155 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 1,313 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | $ 2.50 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Shares outstanding | 460,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 460,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Dividends Payable |  |  |  |  |
Preferred stock dividends accrued during the period | 57,000 us-gaap_PreferredStockDividendsIncomeStatementImpact / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Series 2 | Minimum |  |  |  |  |
Preferred Stock |  |  |  |  |
Redemption price per share (in dollars per share) |  |  |  | $ 3.25 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Series 2 | G. Ward Paxton, chief executive officer |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  | 260,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_ChiefExecutiveOfficerMember |
Series 2 | Director |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  | 60,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_DirectorMember |
Series 2 | CFO |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  | 100,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_ChiefFinancialOfficerMember |
Series 3 |  |  |  |  |
Preferred Stock |  |  |  |  |
Dividend rate (as a percent) |  |  |  |  | 5.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Value of shares issued under private placement |  |  |  |  | 1,200,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Shares issued under private placement |  |  |  |  | 564,607 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Share issued price (in dollars per share) |  |  |  |  | $ 2.18 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Issuance costs incurred for shares issued |  |  |  |  | 100,000 intz_PreferredStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Shares of common stock issued upon conversion of preferred stock | 289,377 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  | 564,607 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Conversion price per share (in dollars per share) |  |  |  |  | $ 2.18 intz_PreferredStockConversionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Liquidation preference value preferred stock price per share | $ 634 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 881 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  | $ 2.18 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Shares outstanding | 289,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 354,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |
Dividends Payable |  |  |  |  |
Preferred stock dividends accrued during the period | $ 33,000 us-gaap_PreferredStockDividendsIncomeStatementImpact / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember |  |  |  |
Series 3 | Minimum |  |  |  |  |
Preferred Stock |  |  |  |  |
Redemption price per share (in dollars per share) |  |  |  |  | $ 2.834 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series 3 | G. Ward Paxton, chief executive officer |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  |  | 123,853 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_ChiefExecutiveOfficerMember
Series 3 | Director |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  |  | 27,523 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_DirectorMember
Series 3 | CFO |  |  |  |  |
Preferred Stock |  |  |  |  |
Shares issued under private placement |  |  |  |  | 68,808 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember / intz_TypeOfIndividualWithRelationshipToEntityAxis = us-gaap_ChiefFinancialOfficerMember

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