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STOCKHOLDERS' EQUITY (Details 2) (Stock Option [Member], USD $) | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Options Outstanding - Number Of Options | 235,478 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions | 40,936 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions | 93,330 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Options Outstanding - Weighted-Average Remaining Life | 4 years 5 months 8 days |  |
Options Outstanding - Weighted Average Exercise Price | $ 5.95 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 |  |
Options Exercisable - Number of Options | 21,544 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions |  |
Options Exercisable - Weighted Average Exercise Price | $ 28.70 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 |  |
Exercise Price One [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices - Lower Range Limit | $ 3.09 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Range of Exercise Prices - Upper Range Limit | $ 4.00 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Options Outstanding - Number Of Options | 141,122 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Options Outstanding - Weighted-Average Remaining Life | 4 years 9 months |  |
Options Outstanding - Weighted Average Exercise Price | $ 3.26 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Options Exercisable - Number of Options | 3,438 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Options Exercisable - Weighted Average Exercise Price | $ 3.12 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceOneMember |  |
Exercise Price Two [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices - Lower Range Limit | $ 4.00 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Range of Exercise Prices - Upper Range Limit | $ 12.00 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Options Outstanding - Number Of Options | 80,625 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Options Outstanding - Weighted-Average Remaining Life | 4 years 5 months 26 days |  |
Options Outstanding - Weighted Average Exercise Price | $ 4.78 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Options Exercisable - Number of Options | 4,375 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Options Exercisable - Weighted Average Exercise Price | $ 11.60 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceTwoMember |  |
Exercise Price Three [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices - Lower Range Limit | $ 12.24 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Range of Exercise Prices - Upper Range Limit | $ 24.00 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Options Outstanding - Number Of Options | 375 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Options Outstanding - Weighted-Average Remaining Life | 6 months 29 days |  |
Options Outstanding - Weighted Average Exercise Price | $ 12.56 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Options Exercisable - Number of Options | 375 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Options Exercisable - Weighted Average Exercise Price | $ 12.56 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceThreeMember |  |
Exercise Price Four [Member] |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |
Range of Exercise Prices - Lower Range Limit | $ 29.04 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |
Range of Exercise Prices - Upper Range Limit | $ 45.12 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |
Options Outstanding - Number Of Options | 13,356 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |
Options Outstanding - Weighted-Average Remaining Life | 1 year 2 months 19 days |  |
Options Outstanding - Weighted Average Exercise Price | $ 41.34 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |
Options Exercisable - Number of Options | 13,356 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |
Options Exercisable - Weighted Average Exercise Price | $ 41.34 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = idn_ExercisePriceFourMember |  |

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