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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows used in operating activities:      
Net income (loss) $ 726us-gaap_NetIncomeLoss $ (1,420)us-gaap_NetIncomeLoss $ (5,987)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash used in operating activities:      
Depreciation 87us-gaap_Depreciation 108us-gaap_Depreciation 119us-gaap_Depreciation
Share-based compensation 579us-gaap_ShareBasedCompensation 499us-gaap_ShareBasedCompensation 672us-gaap_ShareBasedCompensation
Increase (decrease) in severance pay, net (7)us-gaap_IncreaseDecreaseInPostemploymentObligations (19)us-gaap_IncreaseDecreaseInPostemploymentObligations 10us-gaap_IncreaseDecreaseInPostemploymentObligations
Decrease (increase) in trade receivables net of allowance for doubtful accounts 61us-gaap_IncreaseDecreaseInAccountsReceivable (2,716)us-gaap_IncreaseDecreaseInAccountsReceivable 2,080us-gaap_IncreaseDecreaseInAccountsReceivable
Decrease in other current assets 804us-gaap_IncreaseDecreaseInOtherCurrentAssets 348us-gaap_IncreaseDecreaseInOtherCurrentAssets 767us-gaap_IncreaseDecreaseInOtherCurrentAssets
Decrease (increase) in inventories 1,379us-gaap_IncreaseDecreaseInInventories 2,131us-gaap_IncreaseDecreaseInInventories (222)us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in trade payables (705)us-gaap_IncreaseDecreaseInAccountsPayable 348us-gaap_IncreaseDecreaseInAccountsPayable (775)us-gaap_IncreaseDecreaseInAccountsPayable
Increase (decrease) in employees and payroll accrued 276us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities 123us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities (88)us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
Increase (decrease) in other accounts payable and accrued expenses 584us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (9)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (131)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Interest and linkage on short-term loan and restricted cash (4)rdcm_InterestExpenseOtherAndInterestIncomeOtherDomesticDepositsNet 8rdcm_InterestExpenseOtherAndInterestIncomeOtherDomesticDepositsNet 12rdcm_InterestExpenseOtherAndInterestIncomeOtherDomesticDepositsNet
Increase (decrease) in deferred revenue and advances from customers (394)us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits (1,531)us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits 1,082us-gaap_IncreaseDecreaseInDeferredRevenueAndCustomerAdvancesAndDeposits
Net cash provided (used) in operating activities 3,386us-gaap_NetCashProvidedByUsedInOperatingActivities (2,130)us-gaap_NetCashProvidedByUsedInOperatingActivities (2,461)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows used in investing activities:      
Investment in Restricted bank deposits    (38)us-gaap_IncreaseDecreaseInRestrictedCash (1,437)us-gaap_IncreaseDecreaseInRestrictedCash
Maturity of Restricted bank deposits 1,477us-gaap_ProceedsFromSaleOfRestrictedInvestments      
Purchase of property and equipment (65)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (88)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (66)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash provided (used) in investing activities 1,412us-gaap_NetCashProvidedByUsedInInvestingActivities (126)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,503)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Receipts (repayment) of short-term bank credit, net (629)us-gaap_ProceedsFromBankDebt (429)us-gaap_ProceedsFromBankDebt 1,058us-gaap_ProceedsFromBankDebt
Receipts (repayment) of short-term loan (includes $750 from related party)    (1,550)us-gaap_ProceedsFromNotesPayable 1,500us-gaap_ProceedsFromNotesPayable
Proceeds from issuance of shares and warrants , net of issuance expenses of $ 35 (private placement)    3,424us-gaap_ProceedsFromIssuanceOfPrivatePlacement   
Exercise of warrants 21us-gaap_ProceedsFromWarrantExercises 256us-gaap_ProceedsFromWarrantExercises   
Exercise of options 1,694us-gaap_ProceedsFromStockOptionsExercised 226us-gaap_ProceedsFromStockOptionsExercised 45us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 1,086us-gaap_NetCashProvidedByUsedInFinancingActivities 1,927us-gaap_NetCashProvidedByUsedInFinancingActivities 2,603us-gaap_NetCashProvidedByUsedInFinancingActivities
Foreign currency translation adjustments on cash and cash equivalents (221)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 40us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (66)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase in cash and cash equivalents 5,663us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (289)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,427)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 1,185us-gaap_CashAndCashEquivalentsAtCarryingValue 1,474us-gaap_CashAndCashEquivalentsAtCarryingValue 2,901us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 6,848us-gaap_CashAndCashEquivalentsAtCarryingValue 1,185us-gaap_CashAndCashEquivalentsAtCarryingValue 1,474us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-cash investing activities:      
Purchase of property and equipment on credit 4us-gaap_FairValueOfAssetsAcquired 30us-gaap_FairValueOfAssetsAcquired 19us-gaap_FairValueOfAssetsAcquired
Inventory transferred to be used as property and equipment       4rdcm_TransferOfInventoryToPropertyAndEquipment
Cash paid during the year for:      
Interest 13us-gaap_InterestPaid 43us-gaap_InterestPaid 6us-gaap_InterestPaid
Taxes on income $ 180us-gaap_IncomeTaxesPaid    $ 120us-gaap_IncomeTaxesPaid