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Revenues (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Revenue Recognition [Abstract]
Balance, beginning of the period	$ 2,601
Cumulative effect of changes in accounting principles (ASC 606)	(80)
New performance obligations	345
Reclassification to revenue as a result of satisfying performance obligation	(2,521)
Balance, end of the period	366
Less: long-term portion of deferred revenue	(100)
Current portion, end of the period	$ 266

X

- Definition

Cumulative Effect Of Changes In Accounting Principles.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred revenue balance end of period.

+ References

No definition available.

+ Details

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Namespace Prefix:	rdcm_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Long-term portion of deferred revenue.

+ References

No definition available.

+ Details

Name:	rdcm_LongTermPortionOfDeferredRevenue
Namespace Prefix:	rdcm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reclassification to revenue as a result of satisfying performance obligation.

+ References

No definition available.

+ Details

Name:	rdcm_ReclassificationToRevenueAsResultOfSatisfyingPerformanceObligation
Namespace Prefix:	rdcm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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