v2.4.1.9

Income Taxes (Details) (USD $)	12 Months Ended			108 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Income Tax Contingency [Line Items]
Additions	$ 95,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	$ 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	$ 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Excess Tax Benefit from Share-based Compensation, Operating Activities	1,176,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Excess Tax Benefit from Share-based Compensation, Financing Activities	0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	815,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	898,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(2,738,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	(2,458,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	(4,387,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation
Federal	49,049,000us-gaap_CurrentFederalTaxExpenseBenefit	(6,093,000)us-gaap_CurrentFederalTaxExpenseBenefit	93,441,000us-gaap_CurrentFederalTaxExpenseBenefit
State	2,499,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit	225,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit	44,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign source withholding tax	70,703,000us-gaap_CurrentForeignTaxExpenseBenefit	23,269,000us-gaap_CurrentForeignTaxExpenseBenefit	4,173,000us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit)	122,251,000us-gaap_CurrentIncomeTaxExpenseBenefit	17,401,000us-gaap_CurrentIncomeTaxExpenseBenefit	97,658,000us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	(121,937,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(18,727,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	22,209,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	(437,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	2,614,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(4,494,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign source withholding tax	52,231,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit	24,548,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit	21,457,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income taxes	(70,143,000)us-gaap_DeferredIncomeTaxExpenseBenefit	8,435,000us-gaap_DeferredIncomeTaxExpenseBenefit	39,172,000us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit)	34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	41.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations	33.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Net operating losses	168,960,000us-gaap_OperatingIncomeLoss	84,756,000us-gaap_OperatingIncomeLoss	419,030,000us-gaap_OperatingIncomeLoss
Deferred Tax Assets, Operating Loss Carryforwards	71,841,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	70,602,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards		71,841,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred revenue, net	73,273,000us-gaap_DeferredTaxAssetsDeferredIncome	12,809,000us-gaap_DeferredTaxAssetsDeferredIncome		73,273,000us-gaap_DeferredTaxAssetsDeferredIncome
Stock compensation	12,318,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	8,694,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost		12,318,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Patent amortization	18,337,000idcc_DeferredTaxAssetAmortizationOfIntangibles	16,424,000idcc_DeferredTaxAssetAmortizationOfIntangibles		18,337,000idcc_DeferredTaxAssetAmortizationOfIntangibles
Deferred Tax Asset Depreciation	1,139,000idcc_DeferredTaxAssetDepreciation	1,464,000idcc_DeferredTaxAssetDepreciation		1,139,000idcc_DeferredTaxAssetDepreciation
Deferred Tax Asset OTTI	10,164,000idcc_DeferredTaxAssetOTTI	10,116,000idcc_DeferredTaxAssetOTTI		10,164,000idcc_DeferredTaxAssetOTTI
Other accrued liabilities	1,069,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1,088,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities		1,069,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Other employee benefits	9,452,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	5,014,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits		9,452,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Deferred Tax Assets Net Before Deducting Valuation Allowance	197,593,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance	126,211,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance		197,593,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance
Less: valuation allowance	71,731,000us-gaap_DeferredTaxAssetsValuationAllowance	70,492,000us-gaap_DeferredTaxAssetsValuationAllowance		71,731,000us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset	125,862,000us-gaap_DeferredTaxAssetsNet	55,719,000us-gaap_DeferredTaxAssetsNet		125,862,000us-gaap_DeferredTaxAssetsNet
Tax at U.S. statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in federal and state valuation allowance	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Adjustment to tax credits	(4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Adjustments to uncertain tax positions	0.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Permanent differences	1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	3.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Settlement with taxing authorities	1.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Other	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Unrecognized Tax Benefits		0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Deferred Tax Assets, Tax Credit Carryforwards, Research	700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch			700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	1,266,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Foreign Income Tax Expense (Benefit), Continuing Operations	5,700,000us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Liability for Uncertain Tax Positions, Noncurrent Balance as of December 31, 2010	0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Unrecognized Tax Benefits, Period Increase (Decrease)	700,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Reductions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Lapses in statues of limitations	0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Liability for Uncertain Tax Positions, Noncurrent Balance as of December 31, 2011	1,361,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	1,361,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	100,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income taxes paid, including foreign witholding taxes	114,876,000us-gaap_IncomeTaxesPaid	24,961,000us-gaap_IncomeTaxesPaid	116,871,000us-gaap_IncomeTaxesPaid
Taxes Payable	0us-gaap_TaxesPayableCurrentAndNoncurrent	7,056,000us-gaap_TaxesPayableCurrentAndNoncurrent		0us-gaap_TaxesPayableCurrentAndNoncurrent
Federal
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred revenue, net	50,575,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	8,564,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		50,575,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Stock compensation	10,567,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	7,606,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		10,567,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Patent amortization	18,337,000idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	16,424,000idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		18,337,000idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred Tax Asset Depreciation	1,110,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	1,295,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		1,110,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred Tax Asset OTTI	10,010,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	9,815,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		10,010,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Other accrued liabilities	1,097,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	1,044,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		1,097,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Other employee benefits	8,784,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	4,497,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		8,784,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred Tax Assets Net Before Deducting Valuation Allowance	100,480,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	49,245,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		100,480,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Less: valuation allowance	0us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	0us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		0us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Net deferred tax asset	100,480,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	49,245,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		100,480,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
State
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	71,837,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	70,602,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		71,837,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred revenue, net	41,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	56,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		41,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Stock compensation	1,751,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	1,088,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		1,751,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Patent amortization	0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred Tax Asset Depreciation	29,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	169,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		29,000idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred Tax Asset OTTI	154,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	301,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		154,000idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Other accrued liabilities	(28,000)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	44,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		(28,000)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Other employee benefits	668,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	517,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		668,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred Tax Assets Net Before Deducting Valuation Allowance	74,452,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	72,777,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		74,452,000idcc_DeferredTaxAssetsNetBeforeDeductingValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Less: valuation allowance	71,731,000us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	70,492,000us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		71,731,000us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Net deferred tax asset	2,721,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	2,285,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		2,721,000us-gaap_DeferredTaxAssetsNet / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Unrecognized Tax Benefits	12,200,000us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember	12,200,000us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		12,200,000us-gaap_UnrecognizedTaxBenefits / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
New York State Division of Taxation and Finance [Member]
Income Tax Contingency [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	2,500,000us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = us-gaap_NewYorkStateDivisionOfTaxationAndFinanceMember
Foreign
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	4,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		4,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Deferred revenue, net	22,657,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	4,189,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		22,657,000us-gaap_DeferredTaxAssetsDeferredIncome / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Stock compensation	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Patent amortization	0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		0idcc_DeferredTaxAssetAmortizationOfIntangibles / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Deferred Tax Asset Depreciation	0idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		0idcc_DeferredTaxAssetDepreciation / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Deferred Tax Asset OTTI	0idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		0idcc_DeferredTaxAssetOTTI / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Other accrued liabilities	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
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