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TAXES ON INCOME (Reconciliation of Theoretical Tax Benefit and Actual Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			17 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
TAXES ON INCOME [Abstract]
Income (loss) before income taxes, as reported in the statements of operations	$ 906us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ (1,420)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ (5,867)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Statutory tax rate in Israel	26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Theoretical tax benefit	240us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	(355)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	(1,467)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax rate differential on foreign subsidiaries	(176)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	19us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary	(11)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Non-deductible expenses and other permanent differences	222us-gaap_IncomeTaxReconciliationNondeductibleExpense	165us-gaap_IncomeTaxReconciliationNondeductibleExpense	185us-gaap_IncomeTaxReconciliationNondeductibleExpense
Change of deferred tax as result of tax rate change		(727)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Utilization of tax losses in respect of which deferred tax assets were not recorded in prior years		(469)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Differences in taxes arising from foreign currency exchange, net	1,715us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings	186us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Losses and timing differences for which no deferred taxes were recorded	(2,326)us-gaap_IncomeTaxReconciliationOtherAdjustments	1,619us-gaap_IncomeTaxReconciliationOtherAdjustments	1,083us-gaap_IncomeTaxReconciliationOtherAdjustments
Withholding taxes that were deducted by the Company''s clients	180rdcm_IncomeTaxReconciliationWithholdingTaxesDductedByCients		120rdcm_IncomeTaxReconciliationWithholdingTaxesDductedByCients
Other	325us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(438)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	210us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income taxes	$ 180us-gaap_IncomeTaxExpenseBenefit		$ 120us-gaap_IncomeTaxExpenseBenefit

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to withholding taxes that were deducted by the Company''s clients.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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