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Short-Term Bank Deposits (Details Textual) $ in Thousands	Jun. 30, 2019 USD ($)
Short-Term Bank Deposits (Textual)
Short-term bank deposits include accrued interest	$ 549

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- References

No definition available.

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Name:	rdcm_ShorttermBankDepositsTextualAbstract
Namespace Prefix:	rdcm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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No definition available.

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Name:	us-gaap_DepositsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant