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General (Details)	Dec. 31, 2020
Accounting Policies [Abstract]
Consolidated revenues percentage	93.00%

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- Definition

Consolidated revenues percentage.

+ References

No definition available.

+ Details

Name:	rdcm_ConsolidatedRevenuesPercentage
Namespace Prefix:	rdcm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration